Merge branch 'en/merge-recursive-directory-rename-fixes'

When all files from some subdirectory were renamed to the root
directory, the directory rename heuristics would fail to detect that
as a rename/merge of the subdirectory to the root directory, which has
been corrected.

* en/merge-recursive-directory-rename-fixes:
  t604[236]: do not run setup in separate tests
  merge-recursive: fix merging a subdirectory into the root directory
  merge-recursive: clean up get_renamed_dir_portion()

4 files changed, 582 insertions, 336 deletions

diff --git a/merge-recursive.c b/merge-recursive.c
index 42be7c9960..11869ad81c 100644
--- a/merge-recursive.c
+++ b/merge-recursive.c
@@ -1951,6 +1951,16 @@ static char *apply_dir_rename(struct dir_rename_entry *entry,
 		return NULL;
 
 	oldlen = strlen(entry->dir);
+	if (entry->new_dir.len == 0)
+		/*
+		 * If someone renamed/merged a subdirectory into the root
+		 * directory (e.g. 'some/subdir' -> ''), then we want to
+		 * avoid returning
+		 *     '' + '/filename'
+		 * as the rename; we need to make old_path + oldlen advance
+		 * past the '/' character.
+		 */
+		oldlen++;
 	newlen = entry->new_dir.len + (strlen(old_path) - oldlen) + 1;
 	strbuf_grow(&new_path, newlen);
 	strbuf_addbuf(&new_path, &entry->new_dir);
@@ -1963,8 +1973,8 @@ static void get_renamed_dir_portion(const char *old_path, const char *new_path,
 				    char **old_dir, char **new_dir)
 {
 	char *end_of_old, *end_of_new;
-	int old_len, new_len;
 
+	/* Default return values: NULL, meaning no rename */
 	*old_dir = NULL;
 	*new_dir = NULL;
 
@@ -1975,43 +1985,91 @@ static void get_renamed_dir_portion(const char *old_path, const char *new_path,
 	 *    "a/b/c/d" was renamed to "a/b/some/thing/else"
 	 * so, for this example, this function returns "a/b/c/d" in
 	 * *old_dir and "a/b/some/thing/else" in *new_dir.
-	 *
-	 * Also, if the basename of the file changed, we don't care.  We
-	 * want to know which portion of the directory, if any, changed.
+	 */
+
+	/*
+	 * If the basename of the file changed, we don't care.  We want
+	 * to know which portion of the directory, if any, changed.
 	 */
 	end_of_old = strrchr(old_path, '/');
 	end_of_new = strrchr(new_path, '/');
 
-	if (end_of_old == NULL || end_of_new == NULL)
+	/*
+	 * If end_of_old is NULL, old_path wasn't in a directory, so there
+	 * could not be a directory rename (our rule elsewhere that a
+	 * directory which still exists is not considered to have been
+	 * renamed means the root directory can never be renamed -- because
+	 * the root directory always exists).
+	 */
+	if (end_of_old == NULL)
+		return; /* Note: *old_dir and *new_dir are still NULL */
+
+	/*
+	 * If new_path contains no directory (end_of_new is NULL), then we
+	 * have a rename of old_path's directory to the root directory.
+	 */
+	if (end_of_new == NULL) {
+		*old_dir = xstrndup(old_path, end_of_old - old_path);
+		*new_dir = xstrdup("");
 		return;
+	}
+
+	/* Find the first non-matching character traversing backwards */
 	while (*--end_of_new == *--end_of_old &&
 	       end_of_old != old_path &&
 	       end_of_new != new_path)
 		; /* Do nothing; all in the while loop */
+
 	/*
-	 * We've found the first non-matching character in the directory
-	 * paths.  That means the current directory we were comparing
-	 * represents the rename.  Move end_of_old and end_of_new back
-	 * to the full directory name.
+	 * If both got back to the beginning of their strings, then the
+	 * directory didn't change at all, only the basename did.
 	 */
-	if (*end_of_old == '/')
-		end_of_old++;
-	if (*end_of_old != '/')
-		end_of_new++;
-	end_of_old = strchr(end_of_old, '/');
-	end_of_new = strchr(end_of_new, '/');
+	if (end_of_old == old_path && end_of_new == new_path &&
+	    *end_of_old == *end_of_new)
+		return; /* Note: *old_dir and *new_dir are still NULL */
 
 	/*
-	 * It may have been the case that old_path and new_path were the same
-	 * directory all along.  Don't claim a rename if they're the same.
+	 * If end_of_new got back to the beginning of its string, and
+	 * end_of_old got back to the beginning of some subdirectory, then
+	 * we have a rename/merge of a subdirectory into the root, which
+	 * needs slightly special handling.
+	 *
+	 * Note: There is no need to consider the opposite case, with a
+	 * rename/merge of the root directory into some subdirectory
+	 * because as noted above the root directory always exists so it
+	 * cannot be considered to be renamed.
 	 */
-	old_len = end_of_old - old_path;
-	new_len = end_of_new - new_path;
-
-	if (old_len != new_len || strncmp(old_path, new_path, old_len)) {
-		*old_dir = xstrndup(old_path, old_len);
-		*new_dir = xstrndup(new_path, new_len);
+	if (end_of_new == new_path &&
+	    end_of_old != old_path && end_of_old[-1] == '/') {
+		*old_dir = xstrndup(old_path, --end_of_old - old_path);
+		*new_dir = xstrdup("");
+		return;
 	}
+
+	/*
+	 * We've found the first non-matching character in the directory
+	 * paths.  That means the current characters we were looking at
+	 * were part of the first non-matching subdir name going back from
+	 * the end of the strings.  Get the whole name by advancing both
+	 * end_of_old and end_of_new to the NEXT '/' character.  That will
+	 * represent the entire directory rename.
+	 *
+	 * The reason for the increment is cases like
+	 *    a/b/star/foo/whatever.c -> a/b/tar/foo/random.c
+	 * After dropping the basename and going back to the first
+	 * non-matching character, we're now comparing:
+	 *    a/b/s          and         a/b/
+	 * and we want to be comparing:
+	 *    a/b/star/      and         a/b/tar/
+	 * but without the pre-increment, the one on the right would stay
+	 * a/b/.
+	 */
+	end_of_old = strchr(++end_of_old, '/');
+	end_of_new = strchr(++end_of_new, '/');
+
+	/* Copy the old and new directories into *old_dir and *new_dir. */
+	*old_dir = xstrndup(old_path, end_of_old - old_path);
+	*new_dir = xstrndup(new_path, end_of_new - new_path);
 }
 
 static void remove_hashmap_entries(struct hashmap *dir_renames,
diff --git a/t/t6042-merge-rename-corner-cases.sh b/t/t6042-merge-rename-corner-cases.sh
index c5b57f40c3..b047cf1c1c 100755
--- a/t/t6042-merge-rename-corner-cases.sh
+++ b/t/t6042-merge-rename-corner-cases.sh
@@ -5,7 +5,7 @@ test_description="recursive merge corner cases w/ renames but not criss-crosses"
 
 . ./test-lib.sh
 
-test_expect_success 'setup rename/delete + untracked file' '
+test_setup_rename_delete_untracked () {
 	test_create_repo rename-delete-untracked &&
 	(
 		cd rename-delete-untracked &&
@@ -29,9 +29,10 @@ test_expect_success 'setup rename/delete + untracked file' '
 		git commit -m track-people-instead-of-objects &&
 		echo "Myyy PRECIOUSSS" >ring
 	)
-'
+}
 
 test_expect_success "Does git preserve Gollum's precious artifact?" '
+	test_setup_rename_delete_untracked &&
 	(
 		cd rename-delete-untracked &&
 
@@ -49,7 +50,7 @@ test_expect_success "Does git preserve Gollum's precious artifact?" '
 #
 # We should be able to merge B & C cleanly
 
-test_expect_success 'setup rename/modify/add-source conflict' '
+test_setup_rename_modify_add_source () {
 	test_create_repo rename-modify-add-source &&
 	(
 		cd rename-modify-add-source &&
@@ -70,9 +71,10 @@ test_expect_success 'setup rename/modify/add-source conflict' '
 		git add a &&
 		git commit -m C
 	)
-'
+}
 
 test_expect_failure 'rename/modify/add-source conflict resolvable' '
+	test_setup_rename_modify_add_source &&
 	(
 		cd rename-modify-add-source &&
 
@@ -88,7 +90,7 @@ test_expect_failure 'rename/modify/add-source conflict resolvable' '
 	)
 '
 
-test_expect_success 'setup resolvable conflict missed if rename missed' '
+test_setup_break_detection_1 () {
 	test_create_repo break-detection-1 &&
 	(
 		cd break-detection-1 &&
@@ -110,9 +112,10 @@ test_expect_success 'setup resolvable conflict missed if rename missed' '
 		git add a &&
 		git commit -m C
 	)
-'
+}
 
 test_expect_failure 'conflict caused if rename not detected' '
+	test_setup_break_detection_1 &&
 	(
 		cd break-detection-1 &&
 
@@ -135,7 +138,7 @@ test_expect_failure 'conflict caused if rename not detected' '
 	)
 '
 
-test_expect_success 'setup conflict resolved wrong if rename missed' '
+test_setup_break_detection_2 () {
 	test_create_repo break-detection-2 &&
 	(
 		cd break-detection-2 &&
@@ -160,9 +163,10 @@ test_expect_success 'setup conflict resolved wrong if rename missed' '
 		git add a &&
 		git commit -m E
 	)
-'
+}
 
 test_expect_failure 'missed conflict if rename not detected' '
+	test_setup_break_detection_2 &&
 	(
 		cd break-detection-2 &&
 
@@ -182,7 +186,7 @@ test_expect_failure 'missed conflict if rename not detected' '
 #   Commit B: rename a->b
 #   Commit C: rename a->b, add unrelated a
 
-test_expect_success 'setup undetected rename/add-source causes data loss' '
+test_setup_break_detection_3 () {
 	test_create_repo break-detection-3 &&
 	(
 		cd break-detection-3 &&
@@ -202,9 +206,10 @@ test_expect_success 'setup undetected rename/add-source causes data loss' '
 		git add a &&
 		git commit -m C
 	)
-'
+}
 
 test_expect_failure 'detect rename/add-source and preserve all data' '
+	test_setup_break_detection_3 &&
 	(
 		cd break-detection-3 &&
 
@@ -231,6 +236,7 @@ test_expect_failure 'detect rename/add-source and preserve all data' '
 '
 
 test_expect_failure 'detect rename/add-source and preserve all data, merge other way' '
+	test_setup_break_detection_3 &&
 	(
 		cd break-detection-3 &&
 
@@ -256,10 +262,10 @@ test_expect_failure 'detect rename/add-source and preserve all data, merge other
 	)
 '
 
-test_expect_success 'setup content merge + rename/directory conflict' '
-	test_create_repo rename-directory-1 &&
+test_setup_rename_directory () {
+	test_create_repo rename-directory-$1 &&
 	(
-		cd rename-directory-1 &&
+		cd rename-directory-$1 &&
 
 		printf "1\n2\n3\n4\n5\n6\n" >file &&
 		git add file &&
@@ -290,11 +296,12 @@ test_expect_success 'setup content merge + rename/directory conflict' '
 		test_tick &&
 		git commit -m left
 	)
-'
+}
 
 test_expect_success 'rename/directory conflict + clean content merge' '
+	test_setup_rename_directory 1a &&
 	(
-		cd rename-directory-1 &&
+		cd rename-directory-1a &&
 
 		git checkout left-clean^0 &&
 
@@ -320,8 +327,9 @@ test_expect_success 'rename/directory conflict + clean content merge' '
 '
 
 test_expect_success 'rename/directory conflict + content merge conflict' '
+	test_setup_rename_directory 1b &&
 	(
-		cd rename-directory-1 &&
+		cd rename-directory-1b &&
 
 		git reset --hard &&
 		git clean -fdqx &&
@@ -358,7 +366,7 @@ test_expect_success 'rename/directory conflict + content merge conflict' '
 	)
 '
 
-test_expect_success 'setup content merge + rename/directory conflict w/ disappearing dir' '
+test_setup_rename_directory_2 () {
 	test_create_repo rename-directory-2 &&
 	(
 		cd rename-directory-2 &&
@@ -385,9 +393,10 @@ test_expect_success 'setup content merge + rename/directory conflict w/ disappea
 		test_tick &&
 		git commit -m left
 	)
-'
+}
 
 test_expect_success 'disappearing dir in rename/directory conflict handled' '
+	test_setup_rename_directory_2 &&
 	(
 		cd rename-directory-2 &&
 
@@ -416,10 +425,10 @@ test_expect_success 'disappearing dir in rename/directory conflict handled' '
 #   Commit A: rename a->b, modifying b too
 #   Commit B: modify a, add different b
 
-test_expect_success 'setup rename-with-content-merge vs. add' '
-	test_create_repo rename-with-content-merge-and-add &&
+test_setup_rename_with_content_merge_and_add () {
+	test_create_repo rename-with-content-merge-and-add-$1 &&
 	(
-		cd rename-with-content-merge-and-add &&
+		cd rename-with-content-merge-and-add-$1 &&
 
 		test_seq 1 5 >a &&
 		git add a &&
@@ -438,11 +447,12 @@ test_expect_success 'setup rename-with-content-merge vs. add' '
 		git add a b &&
 		git commit -m B
 	)
-'
+}
 
 test_expect_success 'handle rename-with-content-merge vs. add' '
+	test_setup_rename_with_content_merge_and_add AB &&
 	(
-		cd rename-with-content-merge-and-add &&
+		cd rename-with-content-merge-and-add-AB &&
 
 		git checkout A^0 &&
 
@@ -483,8 +493,9 @@ test_expect_success 'handle rename-with-content-merge vs. add' '
 '
 
 test_expect_success 'handle rename-with-content-merge vs. add, merge other way' '
+	test_setup_rename_with_content_merge_and_add BA &&
 	(
-		cd rename-with-content-merge-and-add &&
+		cd rename-with-content-merge-and-add-BA &&
 
 		git reset --hard &&
 		git clean -fdx &&
@@ -539,7 +550,7 @@ test_expect_success 'handle rename-with-content-merge vs. add, merge other way'
 #   * The working copy should have two files, both of form c~<unique>; does it?
 #   * Nothing else should be present.  Is anything?
 
-test_expect_success 'setup rename/rename (2to1) + modify/modify' '
+test_setup_rename_rename_2to1 () {
 	test_create_repo rename-rename-2to1 &&
 	(
 		cd rename-rename-2to1 &&
@@ -562,9 +573,10 @@ test_expect_success 'setup rename/rename (2to1) + modify/modify' '
 		git add a &&
 		git commit -m C
 	)
-'
+}
 
 test_expect_success 'handle rename/rename (2to1) conflict correctly' '
+	test_setup_rename_rename_2to1 &&
 	(
 		cd rename-rename-2to1 &&
 
@@ -610,7 +622,7 @@ test_expect_success 'handle rename/rename (2to1) conflict correctly' '
 #   Commit A: new file: a
 #   Commit B: rename a->b
 #   Commit C: rename a->c
-test_expect_success 'setup simple rename/rename (1to2) conflict' '
+test_setup_rename_rename_1to2 () {
 	test_create_repo rename-rename-1to2 &&
 	(
 		cd rename-rename-1to2 &&
@@ -631,9 +643,10 @@ test_expect_success 'setup simple rename/rename (1to2) conflict' '
 		test_tick &&
 		git commit -m C
 	)
-'
+}
 
 test_expect_success 'merge has correct working tree contents' '
+	test_setup_rename_rename_1to2 &&
 	(
 		cd rename-rename-1to2 &&
 
@@ -667,7 +680,7 @@ test_expect_success 'merge has correct working tree contents' '
 #
 # Merging of B & C should NOT be clean; there's a rename/rename conflict
 
-test_expect_success 'setup rename/rename(1to2)/add-source conflict' '
+test_setup_rename_rename_1to2_add_source_1 () {
 	test_create_repo rename-rename-1to2-add-source-1 &&
 	(
 		cd rename-rename-1to2-add-source-1 &&
@@ -687,9 +700,10 @@ test_expect_success 'setup rename/rename(1to2)/add-source conflict' '
 		git add a &&
 		git commit -m C
 	)
-'
+}
 
 test_expect_failure 'detect conflict with rename/rename(1to2)/add-source merge' '
+	test_setup_rename_rename_1to2_add_source_1 &&
 	(
 		cd rename-rename-1to2-add-source-1 &&
 
@@ -714,7 +728,7 @@ test_expect_failure 'detect conflict with rename/rename(1to2)/add-source merge'
 	)
 '
 
-test_expect_success 'setup rename/rename(1to2)/add-source resolvable conflict' '
+test_setup_rename_rename_1to2_add_source_2 () {
 	test_create_repo rename-rename-1to2-add-source-2 &&
 	(
 		cd rename-rename-1to2-add-source-2 &&
@@ -737,9 +751,10 @@ test_expect_success 'setup rename/rename(1to2)/add-source resolvable conflict' '
 		test_tick &&
 		git commit -m two
 	)
-'
+}
 
 test_expect_failure 'rename/rename/add-source still tracks new a file' '
+	test_setup_rename_rename_1to2_add_source_2 &&
 	(
 		cd rename-rename-1to2-add-source-2 &&
 
@@ -759,7 +774,7 @@ test_expect_failure 'rename/rename/add-source still tracks new a file' '
 	)
 '
 
-test_expect_success 'setup rename/rename(1to2)/add-dest conflict' '
+test_setup_rename_rename_1to2_add_dest () {
 	test_create_repo rename-rename-1to2-add-dest &&
 	(
 		cd rename-rename-1to2-add-dest &&
@@ -784,9 +799,10 @@ test_expect_success 'setup rename/rename(1to2)/add-dest conflict' '
 		test_tick &&
 		git commit -m two
 	)
-'
+}
 
 test_expect_success 'rename/rename/add-dest merge still knows about conflicting file versions' '
+	test_setup_rename_rename_1to2_add_dest &&
 	(
 		cd rename-rename-1to2-add-dest &&
 
@@ -838,7 +854,7 @@ test_expect_success 'rename/rename/add-dest merge still knows about conflicting
 #   Commit B: rename foo->bar
 #   Expected: CONFLICT (rename/add/delete), two-way merged bar
 
-test_expect_success 'rad-setup: rename/add/delete conflict' '
+test_setup_rad () {
 	test_create_repo rad &&
 	(
 		cd rad &&
@@ -860,9 +876,10 @@ test_expect_success 'rad-setup: rename/add/delete conflict' '
 		git mv foo bar &&
 		git commit -m "rename foo to bar"
 	)
-'
+}
 
 test_expect_failure 'rad-check: rename/add/delete conflict' '
+	test_setup_rad &&
 	(
 		cd rad &&
 
@@ -904,7 +921,7 @@ test_expect_failure 'rad-check: rename/add/delete conflict' '
 #   Commit B: rename bar->baz, rm foo
 #   Expected: CONFLICT (rename/rename/delete/delete), two-way merged baz
 
-test_expect_success 'rrdd-setup: rename/rename(2to1)/delete/delete conflict' '
+test_setup_rrdd () {
 	test_create_repo rrdd &&
 	(
 		cd rrdd &&
@@ -927,9 +944,10 @@ test_expect_success 'rrdd-setup: rename/rename(2to1)/delete/delete conflict' '
 		git rm foo &&
 		git commit -m "Rename bar, remove foo"
 	)
-'
+}
 
 test_expect_failure 'rrdd-check: rename/rename(2to1)/delete/delete conflict' '
+	test_setup_rrdd &&
 	(
 		cd rrdd &&
 
@@ -973,7 +991,7 @@ test_expect_failure 'rrdd-check: rename/rename(2to1)/delete/delete conflict' '
 #   Expected: six CONFLICT(rename/rename) messages, each path in two of the
 #             multi-way merged contents found in two, four, six
 
-test_expect_success 'mod6-setup: chains of rename/rename(1to2) and rename/rename(2to1)' '
+test_setup_mod6 () {
 	test_create_repo mod6 &&
 	(
 		cd mod6 &&
@@ -1009,9 +1027,10 @@ test_expect_success 'mod6-setup: chains of rename/rename(1to2) and rename/rename
 		test_tick &&
 		git commit -m "B"
 	)
-'
+}
 
 test_expect_failure 'mod6-check: chains of rename/rename(1to2) and rename/rename(2to1)' '
+	test_setup_mod6 &&
 	(
 		cd mod6 &&
 
@@ -1108,7 +1127,8 @@ test_conflicts_with_adds_and_renames() {
 	#      files.  Is it present?
 	#   4) There should not be any three~* files in the working
 	#      tree
-	test_expect_success "setup simple $sideL/$sideR conflict" '
+	test_setup_collision_conflict () {
+	#test_expect_success "setup simple $sideL/$sideR conflict" '
 		test_create_repo simple_${sideL}_${sideR} &&
 		(
 			cd simple_${sideL}_${sideR} &&
@@ -1185,9 +1205,11 @@ test_conflicts_with_adds_and_renames() {
 			fi &&
 			test_tick && git commit -m R
 		)
-	'
+	#'
+	}
 
 	test_expect_success "check simple $sideL/$sideR conflict" '
+		test_setup_collision_conflict &&
 		(
 			cd simple_${sideL}_${sideR} &&
 
@@ -1254,7 +1276,7 @@ test_conflicts_with_adds_and_renames add    add
 #
 #   So, we have four different conflicting files that all end up at path
 #   'three'.
-test_expect_success 'setup nested conflicts from rename/rename(2to1)' '
+test_setup_nested_conflicts_from_rename_rename () {
 	test_create_repo nested_conflicts_from_rename_rename &&
 	(
 		cd nested_conflicts_from_rename_rename &&
@@ -1305,9 +1327,10 @@ test_expect_success 'setup nested conflicts from rename/rename(2to1)' '
 		git add one three &&
 		test_tick && git commit -m german
 	)
-'
+}
 
 test_expect_success 'check nested conflicts from rename/rename(2to1)' '
+	test_setup_nested_conflicts_from_rename_rename &&
 	(
 		cd nested_conflicts_from_rename_rename &&
 
diff --git a/t/t6043-merge-rename-directories.sh b/t/t6043-merge-rename-directories.sh
index c966147d5d..bd2f97ba95 100755
--- a/t/t6043-merge-rename-directories.sh
+++ b/t/t6043-merge-rename-directories.sh
@@ -38,7 +38,7 @@ test_description="recursive merge with directory renames"
 #   Commit B: z/{b,c,d,e/f}
 #   Expected: y/{b,c,d,e/f}
 
-test_expect_success '1a-setup: Simple directory rename detection' '
+test_setup_1a () {
 	test_create_repo 1a &&
 	(
 		cd 1a &&
@@ -67,9 +67,10 @@ test_expect_success '1a-setup: Simple directory rename detection' '
 		test_tick &&
 		git commit -m "B"
 	)
-'
+}
 
-test_expect_success '1a-check: Simple directory rename detection' '
+test_expect_success '1a: Simple directory rename detection' '
+	test_setup_1a &&
 	(
 		cd 1a &&
 
@@ -103,7 +104,7 @@ test_expect_success '1a-check: Simple directory rename detection' '
 #   Commit B: y/{b,c,d}
 #   Expected: y/{b,c,d,e}
 
-test_expect_success '1b-setup: Merge a directory with another' '
+test_setup_1b () {
 	test_create_repo 1b &&
 	(
 		cd 1b &&
@@ -134,9 +135,10 @@ test_expect_success '1b-setup: Merge a directory with another' '
 		test_tick &&
 		git commit -m "B"
 	)
-'
+}
 
-test_expect_success '1b-check: Merge a directory with another' '
+test_expect_success '1b: Merge a directory with another' '
+	test_setup_1b &&
 	(
 		cd 1b &&
 
@@ -165,7 +167,7 @@ test_expect_success '1b-check: Merge a directory with another' '
 #   Commit B: z/{b,c,d}
 #   Expected: y/{b,c,d}  (because x/d -> z/d -> y/d)
 
-test_expect_success '1c-setup: Transitive renaming' '
+test_setup_1c () {
 	test_create_repo 1c &&
 	(
 		cd 1c &&
@@ -193,9 +195,10 @@ test_expect_success '1c-setup: Transitive renaming' '
 		test_tick &&
 		git commit -m "B"
 	)
-'
+}
 
-test_expect_success '1c-check: Transitive renaming' '
+test_expect_success '1c: Transitive renaming' '
+	test_setup_1c &&
 	(
 		cd 1c &&
 
@@ -227,7 +230,7 @@ test_expect_success '1c-check: Transitive renaming' '
 #   Note: y/m & z/n should definitely move into x.  By the same token, both
 #         y/wham_1 & z/wham_2 should too...giving us a conflict.
 
-test_expect_success '1d-setup: Directory renames cause a rename/rename(2to1) conflict' '
+test_setup_1d () {
 	test_create_repo 1d &&
 	(
 		cd 1d &&
@@ -262,9 +265,10 @@ test_expect_success '1d-setup: Directory renames cause a rename/rename(2to1) con
 		test_tick &&
 		git commit -m "B"
 	)
-'
+}
 
-test_expect_success '1d-check: Directory renames cause a rename/rename(2to1) conflict' '
+test_expect_success '1d: Directory renames cause a rename/rename(2to1) conflict' '
+	test_setup_1d &&
 	(
 		cd 1d &&
 
@@ -313,7 +317,7 @@ test_expect_success '1d-check: Directory renames cause a rename/rename(2to1) con
 #   Commit B: z/{oldb,oldc,d}
 #   Expected: y/{newb,newc,d}
 
-test_expect_success '1e-setup: Renamed directory, with all files being renamed too' '
+test_setup_1e () {
 	test_create_repo 1e &&
 	(
 		cd 1e &&
@@ -342,9 +346,10 @@ test_expect_success '1e-setup: Renamed directory, with all files being renamed t
 		test_tick &&
 		git commit -m "B"
 	)
-'
+}
 
-test_expect_success '1e-check: Renamed directory, with all files being renamed too' '
+test_expect_success '1e: Renamed directory, with all files being renamed too' '
+	test_setup_1e &&
 	(
 		cd 1e &&
 
@@ -371,7 +376,7 @@ test_expect_success '1e-check: Renamed directory, with all files being renamed t
 #   Commit B: y/{b,c}, x/{d,e,f}
 #   Expected: y/{b,c}, x/{d,e,f,g}
 
-test_expect_success '1f-setup: Split a directory into two other directories' '
+test_setup_1f () {
 	test_create_repo 1f &&
 	(
 		cd 1f &&
@@ -408,9 +413,10 @@ test_expect_success '1f-setup: Split a directory into two other directories' '
 		test_tick &&
 		git commit -m "B"
 	)
-'
+}
 
-test_expect_success '1f-check: Split a directory into two other directories' '
+test_expect_success '1f: Split a directory into two other directories' '
+	test_setup_1f &&
 	(
 		cd 1f &&
 
@@ -459,7 +465,7 @@ test_expect_success '1f-check: Split a directory into two other directories' '
 #   Commit A: y/b, w/c
 #   Commit B: z/{b,c,d}
 #   Expected: y/b, w/c, z/d, with warning about z/ -> (y/ vs. w/) conflict
-test_expect_success '2a-setup: Directory split into two on one side, with equal numbers of paths' '
+test_setup_2a () {
 	test_create_repo 2a &&
 	(
 		cd 2a &&
@@ -489,9 +495,10 @@ test_expect_success '2a-setup: Directory split into two on one side, with equal
 		test_tick &&
 		git commit -m "B"
 	)
-'
+}
 
-test_expect_success '2a-check: Directory split into two on one side, with equal numbers of paths' '
+test_expect_success '2a: Directory split into two on one side, with equal numbers of paths' '
+	test_setup_2a &&
 	(
 		cd 2a &&
 
@@ -520,7 +527,7 @@ test_expect_success '2a-check: Directory split into two on one side, with equal
 #   Commit A: y/b, w/c
 #   Commit B: z/{b,c}, x/d
 #   Expected: y/b, w/c, x/d; No warning about z/ -> (y/ vs. w/) conflict
-test_expect_success '2b-setup: Directory split into two on one side, with equal numbers of paths' '
+test_setup_2b () {
 	test_create_repo 2b &&
 	(
 		cd 2b &&
@@ -551,9 +558,10 @@ test_expect_success '2b-setup: Directory split into two on one side, with equal
 		test_tick &&
 		git commit -m "B"
 	)
-'
+}
 
-test_expect_success '2b-check: Directory split into two on one side, with equal numbers of paths' '
+test_expect_success '2b: Directory split into two on one side, with equal numbers of paths' '
+	test_setup_2b &&
 	(
 		cd 2b &&
 
@@ -601,7 +609,7 @@ test_expect_success '2b-check: Directory split into two on one side, with equal
 #   Commit A: z/{b,c,d} (no change)
 #   Commit B: y/{b,c}, x/d
 #   Expected: y/{b,c}, x/d
-test_expect_success '3a-setup: Avoid implicit rename if involved as source on other side' '
+test_setup_3a () {
 	test_create_repo 3a &&
 	(
 		cd 3a &&
@@ -632,9 +640,10 @@ test_expect_success '3a-setup: Avoid implicit rename if involved as source on ot
 		test_tick &&
 		git commit -m "B"
 	)
-'
+}
 
-test_expect_success '3a-check: Avoid implicit rename if involved as source on other side' '
+test_expect_success '3a: Avoid implicit rename if involved as source on other side' '
+	test_setup_3a &&
 	(
 		cd 3a &&
 
@@ -664,7 +673,7 @@ test_expect_success '3a-check: Avoid implicit rename if involved as source on ot
 #         get it involved in directory rename detection.  If it were, we might
 #         end up with CONFLICT:(z/d -> y/d vs. x/d vs. w/d), i.e. a
 #         rename/rename/rename(1to3) conflict, which is just weird.
-test_expect_success '3b-setup: Avoid implicit rename if involved as source on current side' '
+test_setup_3b () {
 	test_create_repo 3b &&
 	(
 		cd 3b &&
@@ -697,9 +706,10 @@ test_expect_success '3b-setup: Avoid implicit rename if involved as source on cu
 		test_tick &&
 		git commit -m "B"
 	)
-'
+}
 
-test_expect_success '3b-check: Avoid implicit rename if involved as source on current side' '
+test_expect_success '3b: Avoid implicit rename if involved as source on current side' '
+	test_setup_3b &&
 	(
 		cd 3b &&
 
@@ -786,7 +796,7 @@ test_expect_success '3b-check: Avoid implicit rename if involved as source on cu
 #   Expected: y/{b,c,d}, z/{e,f}
 #   NOTE: Even though most files from z moved to y, we don't want f to follow.
 
-test_expect_success '4a-setup: Directory split, with original directory still present' '
+test_setup_4a () {
 	test_create_repo 4a &&
 	(
 		cd 4a &&
@@ -818,9 +828,10 @@ test_expect_success '4a-setup: Directory split, with original directory still pr
 		test_tick &&
 		git commit -m "B"
 	)
-'
+}
 
-test_expect_success '4a-check: Directory split, with original directory still present' '
+test_expect_success '4a: Directory split, with original directory still present' '
+	test_setup_4a &&
 	(
 		cd 4a &&
 
@@ -874,7 +885,7 @@ test_expect_success '4a-check: Directory split, with original directory still pr
 #         of history, giving us no way to represent this conflict in the
 #         index.
 
-test_expect_success '5a-setup: Merge directories, other side adds files to original and target' '
+test_setup_5a () {
 	test_create_repo 5a &&
 	(
 		cd 5a &&
@@ -907,9 +918,10 @@ test_expect_success '5a-setup: Merge directories, other side adds files to origi
 		test_tick &&
 		git commit -m "B"
 	)
-'
+}
 
-test_expect_success '5a-check: Merge directories, other side adds files to original and target' '
+test_expect_success '5a: Merge directories, other side adds files to original and target' '
+	test_setup_5a &&
 	(
 		cd 5a &&
 
@@ -948,7 +960,7 @@ test_expect_success '5a-check: Merge directories, other side adds files to origi
 #         cause us to bail on directory rename detection for that path, falling
 #         back to git behavior without the directory rename detection.
 
-test_expect_success '5b-setup: Rename/delete in order to get add/add/add conflict' '
+test_setup_5b () {
 	test_create_repo 5b &&
 	(
 		cd 5b &&
@@ -981,9 +993,10 @@ test_expect_success '5b-setup: Rename/delete in order to get add/add/add conflic
 		test_tick &&
 		git commit -m "B"
 	)
-'
+}
 
-test_expect_success '5b-check: Rename/delete in order to get add/add/add conflict' '
+test_expect_success '5b: Rename/delete in order to get add/add/add conflict' '
+	test_setup_5b &&
 	(
 		cd 5b &&
 
@@ -1024,7 +1037,7 @@ test_expect_success '5b-check: Rename/delete in order to get add/add/add conflic
 #             y/d are y/d_2 and y/d_4.  We still do the move from z/e to y/e,
 #             though, because it doesn't have anything in the way.
 
-test_expect_success '5c-setup: Transitive rename would cause rename/rename/rename/add/add/add' '
+test_setup_5c () {
 	test_create_repo 5c &&
 	(
 		cd 5c &&
@@ -1061,9 +1074,10 @@ test_expect_success '5c-setup: Transitive rename would cause rename/rename/renam
 		test_tick &&
 		git commit -m "B"
 	)
-'
+}
 
-test_expect_success '5c-check: Transitive rename would cause rename/rename/rename/add/add/add' '
+test_expect_success '5c: Transitive rename would cause rename/rename/rename/add/add/add' '
+	test_setup_5c &&
 	(
 		cd 5c &&
 
@@ -1113,7 +1127,7 @@ test_expect_success '5c-check: Transitive rename would cause rename/rename/renam
 #         detection for z/d_2, but that doesn't prevent us from applying the
 #         directory rename detection for z/f -> y/f.
 
-test_expect_success '5d-setup: Directory/file/file conflict due to directory rename' '
+test_setup_5d () {
 	test_create_repo 5d &&
 	(
 		cd 5d &&
@@ -1145,9 +1159,10 @@ test_expect_success '5d-setup: Directory/file/file conflict due to directory ren
 		test_tick &&
 		git commit -m "B"
 	)
-'
+}
 
-test_expect_success '5d-check: Directory/file/file conflict due to directory rename' '
+test_expect_success '5d: Directory/file/file conflict due to directory rename' '
+	test_setup_5d &&
 	(
 		cd 5d &&
 
@@ -1205,7 +1220,7 @@ test_expect_success '5d-check: Directory/file/file conflict due to directory ren
 #         them under y/ doesn't accidentally catch z/d and make it look like
 #         it is also involved in a rename/delete conflict.
 
-test_expect_success '6a-setup: Tricky rename/delete' '
+test_setup_6a () {
 	test_create_repo 6a &&
 	(
 		cd 6a &&
@@ -1235,9 +1250,10 @@ test_expect_success '6a-setup: Tricky rename/delete' '
 		test_tick &&
 		git commit -m "B"
 	)
-'
+}
 
-test_expect_success '6a-check: Tricky rename/delete' '
+test_expect_success '6a: Tricky rename/delete' '
+	test_setup_6a &&
 	(
 		cd 6a &&
 
@@ -1271,7 +1287,7 @@ test_expect_success '6a-check: Tricky rename/delete' '
 #         but B did that rename and still decided to put the file into z/,
 #         so we probably shouldn't apply directory rename detection for it.
 
-test_expect_success '6b-setup: Same rename done on both sides' '
+test_setup_6b () {
 	test_create_repo 6b &&
 	(
 		cd 6b &&
@@ -1300,9 +1316,10 @@ test_expect_success '6b-setup: Same rename done on both sides' '
 		test_tick &&
 		git commit -m "B"
 	)
-'
+}
 
-test_expect_success '6b-check: Same rename done on both sides' '
+test_expect_success '6b: Same rename done on both sides' '
+	test_setup_6b &&
 	(
 		cd 6b &&
 
@@ -1334,7 +1351,7 @@ test_expect_success '6b-check: Same rename done on both sides' '
 #   NOTE: Seems obvious, but just checking that the implementation doesn't
 #         "accidentally detect a rename" and give us y/{b,c,d}.
 
-test_expect_success '6c-setup: Rename only done on same side' '
+test_setup_6c () {
 	test_create_repo 6c &&
 	(
 		cd 6c &&
@@ -1362,9 +1379,10 @@ test_expect_success '6c-setup: Rename only done on same side' '
 		test_tick &&
 		git commit -m "B"
 	)
-'
+}
 
-test_expect_success '6c-check: Rename only done on same side' '
+test_expect_success '6c: Rename only done on same side' '
+	test_setup_6c &&
 	(
 		cd 6c &&
 
@@ -1396,7 +1414,7 @@ test_expect_success '6c-check: Rename only done on same side' '
 #   NOTE: Again, this seems obvious but just checking that the implementation
 #         doesn't "accidentally detect a rename" and give us y/{b,c,d}.
 
-test_expect_success '6d-setup: We do not always want transitive renaming' '
+test_setup_6d () {
 	test_create_repo 6d &&
 	(
 		cd 6d &&
@@ -1424,9 +1442,10 @@ test_expect_success '6d-setup: We do not always want transitive renaming' '
 		test_tick &&
 		git commit -m "B"
 	)
-'
+}
 
-test_expect_success '6d-check: We do not always want transitive renaming' '
+test_expect_success '6d: We do not always want transitive renaming' '
+	test_setup_6d &&
 	(
 		cd 6d &&
 
@@ -1458,7 +1477,7 @@ test_expect_success '6d-check: We do not always want transitive renaming' '
 #         doesn't "accidentally detect a rename" and give us y/{b,c} +
 #         add/add conflict on y/d_1 vs y/d_2.
 
-test_expect_success '6e-setup: Add/add from one side' '
+test_setup_6e () {
 	test_create_repo 6e &&
 	(
 		cd 6e &&
@@ -1487,9 +1506,10 @@ test_expect_success '6e-setup: Add/add from one side' '
 		test_tick &&
 		git commit -m "B"
 	)
-'
+}
 
-test_expect_success '6e-check: Add/add from one side' '
+test_expect_success '6e: Add/add from one side' '
+	test_setup_6e &&
 	(
 		cd 6e &&
 
@@ -1552,7 +1572,7 @@ test_expect_success '6e-check: Add/add from one side' '
 #   Expected: y/d, CONFLICT(rename/rename for both z/b and z/c)
 #   NOTE: There's a rename of z/ here, y/ has more renames, so z/d -> y/d.
 
-test_expect_success '7a-setup: rename-dir vs. rename-dir (NOT split evenly) PLUS add-other-file' '
+test_setup_7a () {
 	test_create_repo 7a &&
 	(
 		cd 7a &&
@@ -1583,9 +1603,10 @@ test_expect_success '7a-setup: rename-dir vs. rename-dir (NOT split evenly) PLUS
 		test_tick &&
 		git commit -m "B"
 	)
-'
+}
 
-test_expect_success '7a-check: rename-dir vs. rename-dir (NOT split evenly) PLUS add-other-file' '
+test_expect_success '7a: rename-dir vs. rename-dir (NOT split evenly) PLUS add-other-file' '
+	test_setup_7a &&
 	(
 		cd 7a &&
 
@@ -1623,7 +1644,7 @@ test_expect_success '7a-check: rename-dir vs. rename-dir (NOT split evenly) PLUS
 #   Commit B: z/{b,c,d_1},        w/d_2
 #   Expected: y/{b,c}, CONFLICT(rename/rename(2to1): x/d_1, w/d_2 -> y_d)
 
-test_expect_success '7b-setup: rename/rename(2to1), but only due to transitive rename' '
+test_setup_7b () {
 	test_create_repo 7b &&
 	(
 		cd 7b &&
@@ -1655,9 +1676,10 @@ test_expect_success '7b-setup: rename/rename(2to1), but only due to transitive r
 		test_tick &&
 		git commit -m "B"
 	)
-'
+}
 
-test_expect_success '7b-check: rename/rename(2to1), but only due to transitive rename' '
+test_expect_success '7b: rename/rename(2to1), but only due to transitive rename' '
+	test_setup_7b &&
 	(
 		cd 7b &&
 
@@ -1702,7 +1724,7 @@ test_expect_success '7b-check: rename/rename(2to1), but only due to transitive r
 #         neither CONFLICT(x/d -> w/d vs. z/d)
 #         nor CONFLiCT x/d -> w/d vs. y/d vs. z/d)
 
-test_expect_success '7c-setup: rename/rename(1to...2or3); transitive rename may add complexity' '
+test_setup_7c () {
 	test_create_repo 7c &&
 	(
 		cd 7c &&
@@ -1732,9 +1754,10 @@ test_expect_success '7c-setup: rename/rename(1to...2or3); transitive rename may
 		test_tick &&
 		git commit -m "B"
 	)
-'
+}
 
-test_expect_success '7c-check: rename/rename(1to...2or3); transitive rename may add complexity' '
+test_expect_success '7c: rename/rename(1to...2or3); transitive rename may add complexity' '
+	test_setup_7c &&
 	(
 		cd 7c &&
 
@@ -1766,7 +1789,7 @@ test_expect_success '7c-check: rename/rename(1to...2or3); transitive rename may
 #   Expected: y/{b,c}, CONFLICT(delete x/d vs rename to y/d)
 #   NOTE: z->y so NOT CONFLICT(delete x/d vs rename to z/d)
 
-test_expect_success '7d-setup: transitive rename involved in rename/delete; how is it reported?' '
+test_setup_7d () {
 	test_create_repo 7d &&
 	(
 		cd 7d &&
@@ -1796,9 +1819,10 @@ test_expect_success '7d-setup: transitive rename involved in rename/delete; how
 		test_tick &&
 		git commit -m "B"
 	)
-'
+}
 
-test_expect_success '7d-check: transitive rename involved in rename/delete; how is it reported?' '
+test_expect_success '7d: transitive rename involved in rename/delete; how is it reported?' '
+	test_setup_7d &&
 	(
 		cd 7d &&
 
@@ -1851,7 +1875,7 @@ test_expect_success '7d-check: transitive rename involved in rename/delete; how
 #         see testcases 9c and 9d for further discussion of this issue and
 #         how it's resolved.
 
-test_expect_success '7e-setup: transitive rename in rename/delete AND dirs in the way' '
+test_setup_7e () {
 	test_create_repo 7e &&
 	(
 		cd 7e &&
@@ -1886,9 +1910,10 @@ test_expect_success '7e-setup: transitive rename in rename/delete AND dirs in th
 		test_tick &&
 		git commit -m "B"
 	)
-'
+}
 
-test_expect_success '7e-check: transitive rename in rename/delete AND dirs in the way' '
+test_expect_success '7e: transitive rename in rename/delete AND dirs in the way' '
+	test_setup_7e &&
 	(
 		cd 7e &&
 
@@ -1945,7 +1970,7 @@ test_expect_success '7e-check: transitive rename in rename/delete AND dirs in th
 # simple rule from section 5 prevents me from handling this as optimally as
 # we potentially could.
 
-test_expect_success '8a-setup: Dual-directory rename, one into the others way' '
+test_setup_8a () {
 	test_create_repo 8a &&
 	(
 		cd 8a &&
@@ -1977,9 +2002,10 @@ test_expect_success '8a-setup: Dual-directory rename, one into the others way' '
 		test_tick &&
 		git commit -m "B"
 	)
-'
+}
 
-test_expect_success '8a-check: Dual-directory rename, one into the others way' '
+test_expect_success '8a: Dual-directory rename, one into the others way' '
+	test_setup_8a &&
 	(
 		cd 8a &&
 
@@ -2023,7 +2049,7 @@ test_expect_success '8a-check: Dual-directory rename, one into the others way' '
 # making us fall back to pre-directory-rename-detection behavior for both
 # e_1 and e_2.
 
-test_expect_success '8b-setup: Dual-directory rename, one into the others way, with conflicting filenames' '
+test_setup_8b () {
 	test_create_repo 8b &&
 	(
 		cd 8b &&
@@ -2055,9 +2081,10 @@ test_expect_success '8b-setup: Dual-directory rename, one into the others way, w
 		test_tick &&
 		git commit -m "B"
 	)
-'
+}
 
-test_expect_success '8b-check: Dual-directory rename, one into the others way, with conflicting filenames' '
+test_expect_success '8b: Dual-directory rename, one into the others way, with conflicting filenames' '
+	test_setup_8b &&
 	(
 		cd 8b &&
 
@@ -2096,7 +2123,7 @@ test_expect_success '8b-check: Dual-directory rename, one into the others way, w
 #         rename/rename(1to2) conflicts -- see testcase 9h.  See also
 #         notes in 8d.
 
-test_expect_success '8c-setup: modify/delete or rename+modify/delete?' '
+test_setup_8c () {
 	test_create_repo 8c &&
 	(
 		cd 8c &&
@@ -2127,9 +2154,10 @@ test_expect_success '8c-setup: modify/delete or rename+modify/delete?' '
 		test_tick &&
 		git commit -m "B"
 	)
-'
+}
 
-test_expect_success '8c-check: modify/delete or rename+modify/delete' '
+test_expect_success '8c: modify/delete or rename+modify/delete' '
+	test_setup_8c &&
 	(
 		cd 8c &&
 
@@ -2175,7 +2203,7 @@ test_expect_success '8c-check: modify/delete or rename+modify/delete' '
 #   during merging are supposed to be about opposite sides doing things
 #   differently.
 
-test_expect_success '8d-setup: rename/delete...or not?' '
+test_setup_8d () {
 	test_create_repo 8d &&
 	(
 		cd 8d &&
@@ -2204,9 +2232,10 @@ test_expect_success '8d-setup: rename/delete...or not?' '
 		test_tick &&
 		git commit -m "B"
 	)
-'
+}
 
-test_expect_success '8d-check: rename/delete...or not?' '
+test_expect_success '8d: rename/delete...or not?' '
+	test_setup_8d &&
 	(
 		cd 8d &&
 
@@ -2250,7 +2279,7 @@ test_expect_success '8d-check: rename/delete...or not?' '
 #        about the ramifications of doing that, I didn't know how to rule out
 #        that opening other weird edge and corner cases so I just punted.
 
-test_expect_success '8e-setup: Both sides rename, one side adds to original directory' '
+test_setup_8e () {
 	test_create_repo 8e &&
 	(
 		cd 8e &&
@@ -2279,9 +2308,10 @@ test_expect_success '8e-setup: Both sides rename, one side adds to original dire
 		test_tick &&
 		git commit -m "B"
 	)
-'
+}
 
-test_expect_success '8e-check: Both sides rename, one side adds to original directory' '
+test_expect_success '8e: Both sides rename, one side adds to original directory' '
+	test_setup_8e &&
 	(
 		cd 8e &&
 
@@ -2333,7 +2363,7 @@ test_expect_success '8e-check: Both sides rename, one side adds to original dire
 #         of which one had the most paths going to it.  A naive implementation
 #         of that could take the new file in commit B at z/i to x/w/i or x/i.
 
-test_expect_success '9a-setup: Inner renamed directory within outer renamed directory' '
+test_setup_9a () {
 	test_create_repo 9a &&
 	(
 		cd 9a &&
@@ -2366,9 +2396,10 @@ test_expect_success '9a-setup: Inner renamed directory within outer renamed dire
 		test_tick &&
 		git commit -m "B"
 	)
-'
+}
 
-test_expect_success '9a-check: Inner renamed directory within outer renamed directory' '
+test_expect_success '9a: Inner renamed directory within outer renamed directory' '
+	test_setup_9a &&
 	(
 		cd 9a &&
 
@@ -2404,7 +2435,7 @@ test_expect_success '9a-check: Inner renamed directory within outer renamed dire
 #   Commit B: z/{b,c,d_3}
 #   Expected: y/{b,c,d_merged}
 
-test_expect_success '9b-setup: Transitive rename with content merge' '
+test_setup_9b () {
 	test_create_repo 9b &&
 	(
 		cd 9b &&
@@ -2436,9 +2467,10 @@ test_expect_success '9b-setup: Transitive rename with content merge' '
 		test_tick &&
 		git commit -m "B"
 	)
-'
+}
 
-test_expect_success '9b-check: Transitive rename with content merge' '
+test_expect_success '9b: Transitive rename with content merge' '
+	test_setup_9b &&
 	(
 		cd 9b &&
 
@@ -2491,7 +2523,7 @@ test_expect_success '9b-check: Transitive rename with content merge' '
 #         away, then ignore that particular rename from the other side of
 #         history for any implicit directory renames.
 
-test_expect_success '9c-setup: Doubly transitive rename?' '
+test_setup_9c () {
 	test_create_repo 9c &&
 	(
 		cd 9c &&
@@ -2526,9 +2558,10 @@ test_expect_success '9c-setup: Doubly transitive rename?' '
 		test_tick &&
 		git commit -m "B"
 	)
-'
+}
 
-test_expect_success '9c-check: Doubly transitive rename?' '
+test_expect_success '9c: Doubly transitive rename?' '
+	test_setup_9c &&
 	(
 		cd 9c &&
 
@@ -2579,7 +2612,7 @@ test_expect_success '9c-check: Doubly transitive rename?' '
 #   simple rules that are consistent with what we need for all the other
 #   testcases and simplifies things for the user.
 
-test_expect_success '9d-setup: N-way transitive rename?' '
+test_setup_9d () {
 	test_create_repo 9d &&
 	(
 		cd 9d &&
@@ -2614,9 +2647,10 @@ test_expect_success '9d-setup: N-way transitive rename?' '
 		test_tick &&
 		git commit -m "B"
 	)
-'
+}
 
-test_expect_success '9d-check: N-way transitive rename?' '
+test_expect_success '9d: N-way transitive rename?' '
+	test_setup_9d &&
 	(
 		cd 9d &&
 
@@ -2653,7 +2687,7 @@ test_expect_success '9d-check: N-way transitive rename?' '
 #   Expected: combined/{a,b,c,d,e,f,g,h,i,j,k,l}, CONFLICT(Nto1) warnings,
 #             dir1/yo, dir2/yo, dir3/yo, dirN/yo
 
-test_expect_success '9e-setup: N-to-1 whammo' '
+test_setup_9e () {
 	test_create_repo 9e &&
 	(
 		cd 9e &&
@@ -2696,9 +2730,10 @@ test_expect_success '9e-setup: N-to-1 whammo' '
 		test_tick &&
 		git commit -m "B"
 	)
-'
+}
 
-test_expect_success C_LOCALE_OUTPUT '9e-check: N-to-1 whammo' '
+test_expect_success C_LOCALE_OUTPUT '9e: N-to-1 whammo' '
+	test_setup_9e &&
 	(
 		cd 9e &&
 
@@ -2745,7 +2780,7 @@ test_expect_success C_LOCALE_OUTPUT '9e-check: N-to-1 whammo' '
 #   Commit B: goal/{a,b}/$more_files, goal/c
 #   Expected: priority/{a,b}/$more_files, priority/c
 
-test_expect_success '9f-setup: Renamed directory that only contained immediate subdirs' '
+test_setup_9f () {
 	test_create_repo 9f &&
 	(
 		cd 9f &&
@@ -2774,9 +2809,10 @@ test_expect_success '9f-setup: Renamed directory that only contained immediate s
 		test_tick &&
 		git commit -m "B"
 	)
-'
+}
 
-test_expect_success '9f-check: Renamed directory that only contained immediate subdirs' '
+test_expect_success '9f: Renamed directory that only contained immediate subdirs' '
+	test_setup_9f &&
 	(
 		cd 9f &&
 
@@ -2809,7 +2845,7 @@ test_expect_success '9f-check: Renamed directory that only contained immediate s
 #   Commit B: goal/{a,b}/$more_files, goal/c
 #   Expected: priority/{alpha,bravo}/$more_files, priority/c
 
-test_expect_success '9g-setup: Renamed directory that only contained immediate subdirs, immediate subdirs renamed' '
+test_setup_9g () {
 	test_create_repo 9g &&
 	(
 		cd 9g &&
@@ -2841,9 +2877,9 @@ test_expect_success '9g-setup: Renamed directory that only contained immediate s
 		test_tick &&
 		git commit -m "B"
 	)
-'
+}
 
-test_expect_failure '9g-check: Renamed directory that only contained immediate subdirs, immediate subdirs renamed' '
+test_expect_failure '9g: Renamed directory that only contained immediate subdirs, immediate subdirs renamed' '
 	(
 		cd 9g &&
 
@@ -2877,7 +2913,7 @@ test_expect_failure '9g-check: Renamed directory that only contained immediate s
 #   Expected: y/{b,c}, x/d_2
 #   NOTE: If we applied the z/ -> y/ rename to z/d, then we'd end up with
 #         a rename/rename(1to2) conflict (z/d -> y/d vs. x/d)
-test_expect_success '9h-setup: Avoid dir rename on merely modified path' '
+test_setup_9h () {
 	test_create_repo 9h &&
 	(
 		cd 9h &&
@@ -2910,9 +2946,10 @@ test_expect_success '9h-setup: Avoid dir rename on merely modified path' '
 		test_tick &&
 		git commit -m "B"
 	)
-'
+}
 
-test_expect_success '9h-check: Avoid dir rename on merely modified path' '
+test_expect_success '9h: Avoid dir rename on merely modified path' '
+	test_setup_9h &&
 	(
 		cd 9h &&
 
@@ -2957,7 +2994,7 @@ test_expect_success '9h-check: Avoid dir rename on merely modified path' '
 #   Expected: Aborted Merge +
 #       ERROR_MSG(untracked working tree files would be overwritten by merge)
 
-test_expect_success '10a-setup: Overwrite untracked with normal rename/delete' '
+test_setup_10a () {
 	test_create_repo 10a &&
 	(
 		cd 10a &&
@@ -2983,9 +3020,10 @@ test_expect_success '10a-setup: Overwrite untracked with normal rename/delete' '
 		test_tick &&
 		git commit -m "B"
 	)
-'
+}
 
-test_expect_success '10a-check: Overwrite untracked with normal rename/delete' '
+test_expect_success '10a: Overwrite untracked with normal rename/delete' '
+	test_setup_10a &&
 	(
 		cd 10a &&
 
@@ -3021,7 +3059,7 @@ test_expect_success '10a-check: Overwrite untracked with normal rename/delete' '
 #             z/c_1 -> z/d_1 rename recorded at stage 3 for y/d +
 #       ERROR_MSG(refusing to lose untracked file at 'y/d')
 
-test_expect_success '10b-setup: Overwrite untracked with dir rename + delete' '
+test_setup_10b () {
 	test_create_repo 10b &&
 	(
 		cd 10b &&
@@ -3050,9 +3088,10 @@ test_expect_success '10b-setup: Overwrite untracked with dir rename + delete' '
 		test_tick &&
 		git commit -m "B"
 	)
-'
+}
 
-test_expect_success '10b-check: Overwrite untracked with dir rename + delete' '
+test_expect_success '10b: Overwrite untracked with dir rename + delete' '
+	test_setup_10b &&
 	(
 		cd 10b &&
 
@@ -3098,10 +3137,10 @@ test_expect_success '10b-check: Overwrite untracked with dir rename + delete' '
 #             y/c~B^0 +
 #             ERROR_MSG(Refusing to lose untracked file at y/c)
 
-test_expect_success '10c-setup: Overwrite untracked with dir rename/rename(1to2)' '
-	test_create_repo 10c &&
+test_setup_10c () {
+	test_create_repo 10c_$1 &&
 	(
-		cd 10c &&
+		cd 10c_$1 &&
 
 		mkdir z x &&
 		echo a >z/a &&
@@ -3128,11 +3167,12 @@ test_expect_success '10c-setup: Overwrite untracked with dir rename/rename(1to2)
 		test_tick &&
 		git commit -m "B"
 	)
-'
+}
 
-test_expect_success '10c-check: Overwrite untracked with dir rename/rename(1to2)' '
+test_expect_success '10c1: Overwrite untracked with dir rename/rename(1to2)' '
+	test_setup_10c 1 &&
 	(
-		cd 10c &&
+		cd 10c_1 &&
 
 		git checkout A^0 &&
 		echo important >y/c &&
@@ -3163,9 +3203,10 @@ test_expect_success '10c-check: Overwrite untracked with dir rename/rename(1to2)
 	)
 '
 
-test_expect_success '10c-check: Overwrite untracked with dir rename/rename(1to2), other direction' '
+test_expect_success '10c2: Overwrite untracked with dir rename/rename(1to2), other direction' '
+	test_setup_10c 2 &&
 	(
-		cd 10c &&
+		cd 10c_2 &&
 
 		git reset --hard &&
 		git clean -fdqx &&
@@ -3208,7 +3249,7 @@ test_expect_success '10c-check: Overwrite untracked with dir rename/rename(1to2)
 #             CONFLICT(rename/rename) z/c_1 vs x/f_2 -> y/wham
 #             ERROR_MSG(Refusing to lose untracked file at y/wham)
 
-test_expect_success '10d-setup: Delete untracked with dir rename/rename(2to1)' '
+test_setup_10d () {
 	test_create_repo 10d &&
 	(
 		cd 10d &&
@@ -3240,9 +3281,10 @@ test_expect_success '10d-setup: Delete untracked with dir rename/rename(2to1)' '
 		test_tick &&
 		git commit -m "B"
 	)
-'
+}
 
-test_expect_success '10d-check: Delete untracked with dir rename/rename(2to1)' '
+test_expect_success '10d: Delete untracked with dir rename/rename(2to1)' '
+	test_setup_10d &&
 	(
 		cd 10d &&
 
@@ -3290,7 +3332,7 @@ test_expect_success '10d-check: Delete untracked with dir rename/rename(2to1)' '
 #   Commit B: z/{a,b,c}
 #   Expected: y/{a,b,c} + untracked z/c
 
-test_expect_success '10e-setup: Does git complain about untracked file that is not really in the way?' '
+test_setup_10e () {
 	test_create_repo 10e &&
 	(
 		cd 10e &&
@@ -3317,9 +3359,9 @@ test_expect_success '10e-setup: Does git complain about untracked file that is n
 		test_tick &&
 		git commit -m "B"
 	)
-'
+}
 
-test_expect_failure '10e-check: Does git complain about untracked file that is not really in the way?' '
+test_expect_failure '10e: Does git complain about untracked file that is not really in the way?' '
 	(
 		cd 10e &&
 
@@ -3371,7 +3413,7 @@ test_expect_failure '10e-check: Does git complain about untracked file that is n
 #             z/c~HEAD with contents of B:z/b_v2,
 #             z/c with uncommitted mods on top of A:z/c_v1
 
-test_expect_success '11a-setup: Avoid losing dirty contents with simple rename' '
+test_setup_11a () {
 	test_create_repo 11a &&
 	(
 		cd 11a &&
@@ -3398,9 +3440,10 @@ test_expect_success '11a-setup: Avoid losing dirty contents with simple rename'
 		test_tick &&
 		git commit -m "B"
 	)
-'
+}
 
-test_expect_success '11a-check: Avoid losing dirty contents with simple rename' '
+test_expect_success '11a: Avoid losing dirty contents with simple rename' '
+	test_setup_11a &&
 	(
 		cd 11a &&
 
@@ -3441,7 +3484,7 @@ test_expect_success '11a-check: Avoid losing dirty contents with simple rename'
 #             ERROR_MSG(Refusing to lose dirty file at z/c)
 
 
-test_expect_success '11b-setup: Avoid losing dirty file involved in directory rename' '
+test_setup_11b () {
 	test_create_repo 11b &&
 	(
 		cd 11b &&
@@ -3470,9 +3513,10 @@ test_expect_success '11b-setup: Avoid losing dirty file involved in directory re
 		test_tick &&
 		git commit -m "B"
 	)
-'
+}
 
-test_expect_success '11b-check: Avoid losing dirty file involved in directory rename' '
+test_expect_success '11b: Avoid losing dirty file involved in directory rename' '
+	test_setup_11b &&
 	(
 		cd 11b &&
 
@@ -3515,7 +3559,7 @@ test_expect_success '11b-check: Avoid losing dirty file involved in directory re
 #   Expected: Abort_msg("following files would be overwritten by merge") +
 #             y/c left untouched (still has uncommitted mods)
 
-test_expect_success '11c-setup: Avoid losing not-uptodate with rename + D/F conflict' '
+test_setup_11c () {
 	test_create_repo 11c &&
 	(
 		cd 11c &&
@@ -3545,9 +3589,10 @@ test_expect_success '11c-setup: Avoid losing not-uptodate with rename + D/F conf
 		test_tick &&
 		git commit -m "B"
 	)
-'
+}
 
-test_expect_success '11c-check: Avoid losing not-uptodate with rename + D/F conflict' '
+test_expect_success '11c: Avoid losing not-uptodate with rename + D/F conflict' '
+	test_setup_11c &&
 	(
 		cd 11c &&
 
@@ -3581,7 +3626,7 @@ test_expect_success '11c-check: Avoid losing not-uptodate with rename + D/F conf
 #             Warning_Msg("Refusing to lose dirty file at z/c) +
 #             y/{a,c~HEAD,c/d}, x/b, now-untracked z/c_v1 with uncommitted mods
 
-test_expect_success '11d-setup: Avoid losing not-uptodate with rename + D/F conflict' '
+test_setup_11d () {
 	test_create_repo 11d &&
 	(
 		cd 11d &&
@@ -3612,9 +3657,10 @@ test_expect_success '11d-setup: Avoid losing not-uptodate with rename + D/F conf
 		test_tick &&
 		git commit -m "B"
 	)
-'
+}
 
-test_expect_success '11d-check: Avoid losing not-uptodate with rename + D/F conflict' '
+test_expect_success '11d: Avoid losing not-uptodate with rename + D/F conflict' '
+	test_setup_11d &&
 	(
 		cd 11d &&
 
@@ -3659,7 +3705,7 @@ test_expect_success '11d-check: Avoid losing not-uptodate with rename + D/F conf
 #             y/c~HEAD has A:y/c_2 contents
 #             y/c has dirty file from before merge
 
-test_expect_success '11e-setup: Avoid deleting not-uptodate with dir rename/rename(1to2)/add' '
+test_setup_11e () {
 	test_create_repo 11e &&
 	(
 		cd 11e &&
@@ -3691,9 +3737,10 @@ test_expect_success '11e-setup: Avoid deleting not-uptodate with dir rename/rena
 		test_tick &&
 		git commit -m "B"
 	)
-'
+}
 
-test_expect_success '11e-check: Avoid deleting not-uptodate with dir rename/rename(1to2)/add' '
+test_expect_success '11e: Avoid deleting not-uptodate with dir rename/rename(1to2)/add' '
+	test_setup_11e &&
 	(
 		cd 11e &&
 
@@ -3744,7 +3791,7 @@ test_expect_success '11e-check: Avoid deleting not-uptodate with dir rename/rena
 #             CONFLICT(rename/rename) x/c vs x/d -> y/wham
 #             ERROR_MSG(Refusing to lose dirty file at y/wham)
 
-test_expect_success '11f-setup: Avoid deleting not-uptodate with dir rename/rename(2to1)' '
+test_setup_11f () {
 	test_create_repo 11f &&
 	(
 		cd 11f &&
@@ -3773,9 +3820,10 @@ test_expect_success '11f-setup: Avoid deleting not-uptodate with dir rename/rena
 		test_tick &&
 		git commit -m "B"
 	)
-'
+}
 
-test_expect_success '11f-check: Avoid deleting not-uptodate with dir rename/rename(2to1)' '
+test_expect_success '11f: Avoid deleting not-uptodate with dir rename/rename(2to1)' '
+	test_setup_11f &&
 	(
 		cd 11f &&
 
@@ -3832,7 +3880,7 @@ test_expect_success '11f-check: Avoid deleting not-uptodate with dir rename/rena
 #   Commit B: node1/{leaf1,leaf2,leaf5}, node2/{leaf3,leaf4,leaf6}
 #   Expected: node1/{leaf1,leaf2,leaf5,node2/{leaf3,leaf4,leaf6}}
 
-test_expect_success '12a-setup: Moving one directory hierarchy into another' '
+test_setup_12a () {
 	test_create_repo 12a &&
 	(
 		cd 12a &&
@@ -3862,9 +3910,10 @@ test_expect_success '12a-setup: Moving one directory hierarchy into another' '
 		test_tick &&
 		git commit -m "B"
 	)
-'
+}
 
-test_expect_success '12a-check: Moving one directory hierarchy into another' '
+test_expect_success '12a: Moving one directory hierarchy into another' '
+	test_setup_12a &&
 	(
 		cd 12a &&
 
@@ -3910,7 +3959,7 @@ test_expect_success '12a-check: Moving one directory hierarchy into another' '
 #         To which, I can do no more than shrug my shoulders and say that
 #         even simple rules give weird results when given weird inputs.
 
-test_expect_success '12b-setup: Moving two directory hierarchies into each other' '
+test_setup_12b () {
 	test_create_repo 12b &&
 	(
 		cd 12b &&
@@ -3938,9 +3987,10 @@ test_expect_success '12b-setup: Moving two directory hierarchies into each other
 		test_tick &&
 		git commit -m "B"
 	)
-'
+}
 
-test_expect_success '12b-check: Moving two directory hierarchies into each other' '
+test_expect_success '12b: Moving two directory hierarchies into each other' '
+	test_setup_12b &&
 	(
 		cd 12b &&
 
@@ -3976,7 +4026,7 @@ test_expect_success '12b-check: Moving two directory hierarchies into each other
 #   NOTE: This is *exactly* like 12c, except that every path is modified on
 #         each side of the merge.
 
-test_expect_success '12c-setup: Moving one directory hierarchy into another w/ content merge' '
+test_setup_12c () {
 	test_create_repo 12c &&
 	(
 		cd 12c &&
@@ -4008,9 +4058,10 @@ test_expect_success '12c-setup: Moving one directory hierarchy into another w/ c
 		test_tick &&
 		git commit -m "B"
 	)
-'
+}
 
-test_expect_success '12c-check: Moving one directory hierarchy into another w/ content merge' '
+test_expect_success '12c: Moving one directory hierarchy into another w/ content merge' '
+	test_setup_12c &&
 	(
 		cd 12c &&
 
@@ -4051,6 +4102,122 @@ test_expect_success '12c-check: Moving one directory hierarchy into another w/ c
 	)
 '
 
+# Testcase 12d, Rename/merge of subdirectory into the root
+#   Commit O: a/b/subdir/foo
+#   Commit A: subdir/foo
+#   Commit B: a/b/subdir/foo, a/b/bar
+#   Expected: subdir/foo, bar
+
+test_setup_12d () {
+	test_create_repo 12d &&
+	(
+		cd 12d &&
+
+		mkdir -p a/b/subdir &&
+		test_commit a/b/subdir/foo &&
+
+		git branch O &&
+		git branch A &&
+		git branch B &&
+
+		git checkout A &&
+		mkdir subdir &&
+		git mv a/b/subdir/foo.t subdir/foo.t &&
+		test_tick &&
+		git commit -m "A" &&
+
+		git checkout B &&
+		test_commit a/b/bar
+	)
+}
+
+test_expect_success '12d: Rename/merge subdir into the root, variant 1' '
+	test_setup_12d &&
+	(
+		cd 12d &&
+
+		git checkout A^0 &&
+
+		git -c merge.directoryRenames=true merge -s recursive B^0 &&
+
+		git ls-files -s >out &&
+		test_line_count = 2 out &&
+
+		git rev-parse >actual \
+			HEAD:subdir/foo.t   HEAD:bar.t &&
+		git rev-parse >expect \
+			O:a/b/subdir/foo.t  B:a/b/bar.t &&
+		test_cmp expect actual &&
+
+		git hash-object bar.t >actual &&
+		git rev-parse B:a/b/bar.t >expect &&
+		test_cmp expect actual &&
+
+		test_must_fail git rev-parse HEAD:a/b/subdir/foo.t &&
+		test_must_fail git rev-parse HEAD:a/b/bar.t &&
+		test_path_is_missing a/ &&
+		test_path_is_file bar.t
+	)
+'
+
+# Testcase 12e, Rename/merge of subdirectory into the root
+#   Commit O: a/b/foo
+#   Commit A: foo
+#   Commit B: a/b/foo, a/b/bar
+#   Expected: foo, bar
+
+test_setup_12e () {
+	test_create_repo 12e &&
+	(
+		cd 12e &&
+
+		mkdir -p a/b &&
+		test_commit a/b/foo &&
+
+		git branch O &&
+		git branch A &&
+		git branch B &&
+
+		git checkout A &&
+		mkdir subdir &&
+		git mv a/b/foo.t foo.t &&
+		test_tick &&
+		git commit -m "A" &&
+
+		git checkout B &&
+		test_commit a/b/bar
+	)
+}
+
+test_expect_success '12e: Rename/merge subdir into the root, variant 2' '
+	test_setup_12e &&
+	(
+		cd 12e &&
+
+		git checkout A^0 &&
+
+		git -c merge.directoryRenames=true merge -s recursive B^0 &&
+
+		git ls-files -s >out &&
+		test_line_count = 2 out &&
+
+		git rev-parse >actual \
+			HEAD:foo.t   HEAD:bar.t &&
+		git rev-parse >expect \
+			O:a/b/foo.t  B:a/b/bar.t &&
+		test_cmp expect actual &&
+
+		git hash-object bar.t >actual &&
+		git rev-parse B:a/b/bar.t >expect &&
+		test_cmp expect actual &&
+
+		test_must_fail git rev-parse HEAD:a/b/foo.t &&
+		test_must_fail git rev-parse HEAD:a/b/bar.t &&
+		test_path_is_missing a/ &&
+		test_path_is_file bar.t
+	)
+'
+
 ###########################################################################
 # SECTION 13: Checking informational and conflict messages
 #
@@ -4068,10 +4235,10 @@ test_expect_success '12c-check: Moving one directory hierarchy into another w/ c
 #   Commit B: z/{b,c,d,e/f}
 #   Expected: y/{b,c,d,e/f}, with notices/conflicts for both y/d and y/e/f
 
-test_expect_success '13a-setup: messages for newly added files' '
-	test_create_repo 13a &&
+test_setup_13a () {
+	test_create_repo 13a_$1 &&
 	(
-		cd 13a &&
+		cd 13a_$1 &&
 
 		mkdir z &&
 		echo b >z/b &&
@@ -4097,11 +4264,12 @@ test_expect_success '13a-setup: messages for newly added files' '
 		test_tick &&
 		git commit -m "B"
 	)
-'
+}
 
-test_expect_success '13a-check(conflict): messages for newly added files' '
+test_expect_success '13a(conflict): messages for newly added files' '
+	test_setup_13a conflict &&
 	(
-		cd 13a &&
+		cd 13a_conflict &&
 
 		git checkout A^0 &&
 
@@ -4121,9 +4289,10 @@ test_expect_success '13a-check(conflict): messages for newly added files' '
 	)
 '
 
-test_expect_success '13a-check(info): messages for newly added files' '
+test_expect_success '13a(info): messages for newly added files' '
+	test_setup_13a info &&
 	(
-		cd 13a &&
+		cd 13a_info &&
 
 		git reset --hard &&
 		git checkout A^0 &&
@@ -4153,10 +4322,10 @@ test_expect_success '13a-check(info): messages for newly added files' '
 #   Expected: y/{b,c,d_merged}, with two conflict messages for y/d,
 #             one about content, and one about file location
 
-test_expect_success '13b-setup: messages for transitive rename with conflicted content' '
-	test_create_repo 13b &&
+test_setup_13b () {
+	test_create_repo 13b_$1 &&
 	(
-		cd 13b &&
+		cd 13b_$1 &&
 
 		mkdir x &&
 		mkdir z &&
@@ -4185,11 +4354,12 @@ test_expect_success '13b-setup: messages for transitive rename with conflicted c
 		test_tick &&
 		git commit -m "B"
 	)
-'
+}
 
-test_expect_success '13b-check(conflict): messages for transitive rename with conflicted content' '
+test_expect_success '13b(conflict): messages for transitive rename with conflicted content' '
+	test_setup_13b conflict &&
 	(
-		cd 13b &&
+		cd 13b_conflict &&
 
 		git checkout A^0 &&
 
@@ -4207,9 +4377,10 @@ test_expect_success '13b-check(conflict): messages for transitive rename with co
 	)
 '
 
-test_expect_success '13b-check(info): messages for transitive rename with conflicted content' '
+test_expect_success '13b(info): messages for transitive rename with conflicted content' '
+	test_setup_13b info &&
 	(
-		cd 13b &&
+		cd 13b_info &&
 
 		git reset --hard &&
 		git checkout A^0 &&
@@ -4238,10 +4409,10 @@ test_expect_success '13b-check(info): messages for transitive rename with confli
 #             d and B had full knowledge, but that's a slippery slope as
 #             shown in testcase 13d.
 
-test_expect_success '13c-setup: messages for rename/rename(1to1) via transitive rename' '
-	test_create_repo 13c &&
+test_setup_13c () {
+	test_create_repo 13c_$1 &&
 	(
-		cd 13c &&
+		cd 13c_$1 &&
 
 		mkdir x &&
 		mkdir z &&
@@ -4269,11 +4440,12 @@ test_expect_success '13c-setup: messages for rename/rename(1to1) via transitive
 		test_tick &&
 		git commit -m "B"
 	)
-'
+}
 
-test_expect_success '13c-check(conflict): messages for rename/rename(1to1) via transitive rename' '
+test_expect_success '13c(conflict): messages for rename/rename(1to1) via transitive rename' '
+	test_setup_13c conflict &&
 	(
-		cd 13c &&
+		cd 13c_conflict &&
 
 		git checkout A^0 &&
 
@@ -4290,9 +4462,10 @@ test_expect_success '13c-check(conflict): messages for rename/rename(1to1) via t
 	)
 '
 
-test_expect_success '13c-check(info): messages for rename/rename(1to1) via transitive rename' '
+test_expect_success '13c(info): messages for rename/rename(1to1) via transitive rename' '
+	test_setup_13c info &&
 	(
-		cd 13c &&
+		cd 13c_info &&
 
 		git reset --hard &&
 		git checkout A^0 &&
@@ -4324,10 +4497,10 @@ test_expect_success '13c-check(info): messages for rename/rename(1to1) via trans
 #               * B renames a/y to c/y, and A renames c/->d/ => a/y -> d/y
 #               No conflict in where a/y ends up, so put it in d/y.
 
-test_expect_success '13d-setup: messages for rename/rename(1to1) via dual transitive rename' '
-	test_create_repo 13d &&
+test_setup_13d () {
+	test_create_repo 13d_$1 &&
 	(
-		cd 13d &&
+		cd 13d_$1 &&
 
 		mkdir a &&
 		mkdir b &&
@@ -4356,11 +4529,12 @@ test_expect_success '13d-setup: messages for rename/rename(1to1) via dual transi
 		test_tick &&
 		git commit -m "B"
 	)
-'
+}
 
-test_expect_success '13d-check(conflict): messages for rename/rename(1to1) via dual transitive rename' '
+test_expect_success '13d(conflict): messages for rename/rename(1to1) via dual transitive rename' '
+	test_setup_13d conflict &&
 	(
-		cd 13d &&
+		cd 13d_conflict &&
 
 		git checkout A^0 &&
 
@@ -4380,9 +4554,10 @@ test_expect_success '13d-check(conflict): messages for rename/rename(1to1) via d
 	)
 '
 
-test_expect_success '13d-check(info): messages for rename/rename(1to1) via dual transitive rename' '
+test_expect_success '13d(info): messages for rename/rename(1to1) via dual transitive rename' '
+	test_setup_13d info &&
 	(
-		cd 13d &&
+		cd 13d_info &&
 
 		git reset --hard &&
 		git checkout A^0 &&
@@ -4448,7 +4623,7 @@ test_expect_success '13d-check(info): messages for rename/rename(1to1) via dual
 #          in the outer merge for this special kind of setup, but it at
 #          least avoids hitting a BUG().
 #
-test_expect_success '13e-setup: directory rename detection in recursive case' '
+test_setup_13e () {
 	test_create_repo 13e &&
 	(
 		cd 13e &&
@@ -4493,9 +4668,10 @@ test_expect_success '13e-setup: directory rename detection in recursive case' '
 		test_tick &&
 		git commit -m "D"
 	)
-'
+}
 
-test_expect_success '13e-check: directory rename detection in recursive case' '
+test_expect_success '13e: directory rename detection in recursive case' '
+	test_setup_13e &&
 	(
 		cd 13e &&
 
diff --git a/t/t6046-merge-skip-unneeded-updates.sh b/t/t6046-merge-skip-unneeded-updates.sh
index 3a47623ed3..b7e4669832 100755
--- a/t/t6046-merge-skip-unneeded-updates.sh
+++ b/t/t6046-merge-skip-unneeded-updates.sh
@@ -36,10 +36,10 @@ test_description="merge cases"
 #   Commit B: b_3
 #   Expected: b_2
 
-test_expect_success '1a-setup: Modify(A)/Modify(B), change on B subset of A' '
-	test_create_repo 1a &&
+test_setup_1a () {
+	test_create_repo 1a_$1 &&
 	(
-		cd 1a &&
+		cd 1a_$1 &&
 
 		test_write_lines 1 2 3 4 5 6 7 8 9 10 >b &&
 		git add b &&
@@ -62,13 +62,12 @@ test_expect_success '1a-setup: Modify(A)/Modify(B), change on B subset of A' '
 		test_tick &&
 		git commit -m "B"
 	)
-'
+}
 
-test_expect_success '1a-check-L: Modify(A)/Modify(B), change on B subset of A' '
-	test_when_finished "git -C 1a reset --hard" &&
-	test_when_finished "git -C 1a clean -fd" &&
+test_expect_success '1a-L: Modify(A)/Modify(B), change on B subset of A' '
+	test_setup_1a L &&
 	(
-		cd 1a &&
+		cd 1a_L &&
 
 		git checkout A^0 &&
 
@@ -96,11 +95,10 @@ test_expect_success '1a-check-L: Modify(A)/Modify(B), change on B subset of A' '
 	)
 '
 
-test_expect_success '1a-check-R: Modify(A)/Modify(B), change on B subset of A' '
-	test_when_finished "git -C 1a reset --hard" &&
-	test_when_finished "git -C 1a clean -fd" &&
+test_expect_success '1a-R: Modify(A)/Modify(B), change on B subset of A' '
+	test_setup_1a R &&
 	(
-		cd 1a &&
+		cd 1a_R &&
 
 		git checkout B^0 &&
 
@@ -133,10 +131,10 @@ test_expect_success '1a-check-R: Modify(A)/Modify(B), change on B subset of A' '
 #   Commit B: c_1
 #   Expected: c_2
 
-test_expect_success '2a-setup: Modify(A)/rename(B)' '
-	test_create_repo 2a &&
+test_setup_2a () {
+	test_create_repo 2a_$1 &&
 	(
-		cd 2a &&
+		cd 2a_$1 &&
 
 		test_seq 1 10 >b &&
 		git add b &&
@@ -158,13 +156,12 @@ test_expect_success '2a-setup: Modify(A)/rename(B)' '
 		test_tick &&
 		git commit -m "B"
 	)
-'
+}
 
-test_expect_success '2a-check-L: Modify/rename, merge into modify side' '
-	test_when_finished "git -C 2a reset --hard" &&
-	test_when_finished "git -C 2a clean -fd" &&
+test_expect_success '2a-L: Modify/rename, merge into modify side' '
+	test_setup_2a L &&
 	(
-		cd 2a &&
+		cd 2a_L &&
 
 		git checkout A^0 &&
 
@@ -189,11 +186,10 @@ test_expect_success '2a-check-L: Modify/rename, merge into modify side' '
 	)
 '
 
-test_expect_success '2a-check-R: Modify/rename, merge into rename side' '
-	test_when_finished "git -C 2a reset --hard" &&
-	test_when_finished "git -C 2a clean -fd" &&
+test_expect_success '2a-R: Modify/rename, merge into rename side' '
+	test_setup_2a R &&
 	(
-		cd 2a &&
+		cd 2a_R &&
 
 		git checkout B^0 &&
 
@@ -224,10 +220,10 @@ test_expect_success '2a-check-R: Modify/rename, merge into rename side' '
 #   Commit B: b_3
 #   Expected: c_2
 
-test_expect_success '2b-setup: Rename+Mod(A)/Mod(B), B mods subset of A' '
-	test_create_repo 2b &&
+test_setup_2b () {
+	test_create_repo 2b_$1 &&
 	(
-		cd 2b &&
+		cd 2b_$1 &&
 
 		test_write_lines 1 2 3 4 5 6 7 8 9 10 >b &&
 		git add b &&
@@ -251,13 +247,12 @@ test_expect_success '2b-setup: Rename+Mod(A)/Mod(B), B mods subset of A' '
 		test_tick &&
 		git commit -m "B"
 	)
-'
+}
 
-test_expect_success '2b-check-L: Rename+Mod(A)/Mod(B), B mods subset of A' '
-	test_when_finished "git -C 2b reset --hard" &&
-	test_when_finished "git -C 2b clean -fd" &&
+test_expect_success '2b-L: Rename+Mod(A)/Mod(B), B mods subset of A' '
+	test_setup_2b L &&
 	(
-		cd 2b &&
+		cd 2b_L &&
 
 		git checkout A^0 &&
 
@@ -288,11 +283,10 @@ test_expect_success '2b-check-L: Rename+Mod(A)/Mod(B), B mods subset of A' '
 	)
 '
 
-test_expect_success '2b-check-R: Rename+Mod(A)/Mod(B), B mods subset of A' '
-	test_when_finished "git -C 2b reset --hard" &&
-	test_when_finished "git -C 2b clean -fd" &&
+test_expect_success '2b-R: Rename+Mod(A)/Mod(B), B mods subset of A' '
+	test_setup_2b R &&
 	(
-		cd 2b &&
+		cd 2b_R &&
 
 		git checkout B^0 &&
 
@@ -332,7 +326,7 @@ test_expect_success '2b-check-R: Rename+Mod(A)/Mod(B), B mods subset of A' '
 #         skip the update, then we're in trouble.  This test verifies we do
 #         not make that particular mistake.
 
-test_expect_success '2c-setup: Modify b & add c VS rename b->c' '
+test_setup_2c () {
 	test_create_repo 2c &&
 	(
 		cd 2c &&
@@ -358,9 +352,10 @@ test_expect_success '2c-setup: Modify b & add c VS rename b->c' '
 		test_tick &&
 		git commit -m "B"
 	)
-'
+}
 
-test_expect_success '2c-check: Modify b & add c VS rename b->c' '
+test_expect_success '2c: Modify b & add c VS rename b->c' '
+	test_setup_2c &&
 	(
 		cd 2c &&
 
@@ -428,10 +423,10 @@ test_expect_success '2c-check: Modify b & add c VS rename b->c' '
 #   Commit B: bq_1, bar/whatever
 #   Expected: bar/{bq_2, whatever}
 
-test_expect_success '3a-setup: bq_1->foo/bq_2 on A, foo/->bar/ on B' '
-	test_create_repo 3a &&
+test_setup_3a () {
+	test_create_repo 3a_$1 &&
 	(
-		cd 3a &&
+		cd 3a_$1 &&
 
 		mkdir foo &&
 		test_seq 1 10 >bq &&
@@ -456,13 +451,12 @@ test_expect_success '3a-setup: bq_1->foo/bq_2 on A, foo/->bar/ on B' '
 		test_tick &&
 		git commit -m "B"
 	)
-'
+}
 
-test_expect_success '3a-check-L: bq_1->foo/bq_2 on A, foo/->bar/ on B' '
-	test_when_finished "git -C 3a reset --hard" &&
-	test_when_finished "git -C 3a clean -fd" &&
+test_expect_success '3a-L: bq_1->foo/bq_2 on A, foo/->bar/ on B' '
+	test_setup_3a L &&
 	(
-		cd 3a &&
+		cd 3a_L &&
 
 		git checkout A^0 &&
 
@@ -487,11 +481,10 @@ test_expect_success '3a-check-L: bq_1->foo/bq_2 on A, foo/->bar/ on B' '
 	)
 '
 
-test_expect_success '3a-check-R: bq_1->foo/bq_2 on A, foo/->bar/ on B' '
-	test_when_finished "git -C 3a reset --hard" &&
-	test_when_finished "git -C 3a clean -fd" &&
+test_expect_success '3a-R: bq_1->foo/bq_2 on A, foo/->bar/ on B' '
+	test_setup_3a R &&
 	(
-		cd 3a &&
+		cd 3a_R &&
 
 		git checkout B^0 &&
 
@@ -522,10 +515,10 @@ test_expect_success '3a-check-R: bq_1->foo/bq_2 on A, foo/->bar/ on B' '
 #   Commit B: bq_2, bar/whatever
 #   Expected: bar/{bq_2, whatever}
 
-test_expect_success '3b-setup: bq_1->foo/bq_2 on A, foo/->bar/ on B' '
-	test_create_repo 3b &&
+test_setup_3b () {
+	test_create_repo 3b_$1 &&
 	(
-		cd 3b &&
+		cd 3b_$1 &&
 
 		mkdir foo &&
 		test_seq 1 10 >bq &&
@@ -550,13 +543,12 @@ test_expect_success '3b-setup: bq_1->foo/bq_2 on A, foo/->bar/ on B' '
 		test_tick &&
 		git commit -m "B"
 	)
-'
+}
 
-test_expect_success '3b-check-L: bq_1->foo/bq_2 on A, foo/->bar/ on B' '
-	test_when_finished "git -C 3b reset --hard" &&
-	test_when_finished "git -C 3b clean -fd" &&
+test_expect_success '3b-L: bq_1->foo/bq_2 on A, foo/->bar/ on B' '
+	test_setup_3b L &&
 	(
-		cd 3b &&
+		cd 3b_L &&
 
 		git checkout A^0 &&
 
@@ -581,11 +573,10 @@ test_expect_success '3b-check-L: bq_1->foo/bq_2 on A, foo/->bar/ on B' '
 	)
 '
 
-test_expect_success '3b-check-R: bq_1->foo/bq_2 on A, foo/->bar/ on B' '
-	test_when_finished "git -C 3b reset --hard" &&
-	test_when_finished "git -C 3b clean -fd" &&
+test_expect_success '3b-R: bq_1->foo/bq_2 on A, foo/->bar/ on B' '
+	test_setup_3b R &&
 	(
-		cd 3b &&
+		cd 3b_R &&
 
 		git checkout B^0 &&
 
@@ -621,7 +612,7 @@ test_expect_success '3b-check-R: bq_1->foo/bq_2 on A, foo/->bar/ on B' '
 #   Working copy: b_4
 #   Expected: b_2 for merge, b_4 in working copy
 
-test_expect_success '4a-setup: Change on A, change on B subset of A, dirty mods present' '
+test_setup_4a () {
 	test_create_repo 4a &&
 	(
 		cd 4a &&
@@ -647,7 +638,7 @@ test_expect_success '4a-setup: Change on A, change on B subset of A, dirty mods
 		test_tick &&
 		git commit -m "B"
 	)
-'
+}
 
 # NOTE: For as long as we continue using unpack_trees() without index_only
 #   set to true, it will error out on a case like this claiming the the locally
@@ -655,9 +646,8 @@ test_expect_success '4a-setup: Change on A, change on B subset of A, dirty mods
 #   correct requires doing the merge in-memory first, then realizing that no
 #   updates to the file are necessary, and thus that we can just leave the path
 #   alone.
-test_expect_failure '4a-check: Change on A, change on B subset of A, dirty mods present' '
-	test_when_finished "git -C 4a reset --hard" &&
-	test_when_finished "git -C 4a clean -fd" &&
+test_expect_failure '4a: Change on A, change on B subset of A, dirty mods present' '
+	test_setup_4a &&
 	(
 		cd 4a &&
 
@@ -695,7 +685,7 @@ test_expect_failure '4a-check: Change on A, change on B subset of A, dirty mods
 #   Working copy: c_4
 #   Expected: c_2
 
-test_expect_success '4b-setup: Rename+Mod(A)/Mod(B), change on B subset of A, dirty mods present' '
+test_setup_4b () {
 	test_create_repo 4b &&
 	(
 		cd 4b &&
@@ -722,11 +712,10 @@ test_expect_success '4b-setup: Rename+Mod(A)/Mod(B), change on B subset of A, di
 		test_tick &&
 		git commit -m "B"
 	)
-'
+}
 
-test_expect_success '4b-check: Rename+Mod(A)/Mod(B), change on B subset of A, dirty mods present' '
-	test_when_finished "git -C 4b reset --hard" &&
-	test_when_finished "git -C 4b clean -fd" &&
+test_expect_success '4b: Rename+Mod(A)/Mod(B), change on B subset of A, dirty mods present' '
+	test_setup_4b &&
 	(
 		cd 4b &&