Merge branch 'jk/test-shell-trace'

Test scripts were taught to notice "-x" option to show shell trace,
as if the tests were run under "sh -x".

* jk/test-shell-trace:
  test-lib.sh: support -x option for shell-tracing
  t5304: use helper to report failure of "test foo = bar"
  t5304: use test_path_is_* instead of "test -f"

4 files changed, 84 insertions, 35 deletions

diff --git a/t/README b/t/README
index 52c77ae936..9952261299 100644
--- a/t/README
+++ b/t/README
@@ -82,6 +82,12 @@ appropriately before running "make".
 	numbers matching <pattern>.  The number matched against is
 	simply the running count of the test within the file.
 
+-x::
+	Turn on shell tracing (i.e., `set -x`) during the tests
+	themselves. Implies `--verbose`. Note that this can cause
+	failures in some tests which redirect and test the
+	output of shell functions. Use with caution.
+
 -d::
 --debug::
 	This may help the person who is developing a new test.
diff --git a/t/t5304-prune.sh b/t/t5304-prune.sh
index 01c6a3fc1d..e32e46dee1 100755
--- a/t/t5304-prune.sh
+++ b/t/t5304-prune.sh
@@ -13,8 +13,8 @@ add_blob() {
 	before=$(git count-objects | sed "s/ .*//") &&
 	BLOB=$(echo aleph_0 | git hash-object -w --stdin) &&
 	BLOB_FILE=.git/objects/$(echo $BLOB | sed "s/^../&\//") &&
-	test $((1 + $before)) = $(git count-objects | sed "s/ .*//") &&
-	test -f $BLOB_FILE &&
+	verbose test $((1 + $before)) = $(git count-objects | sed "s/ .*//") &&
+	test_path_is_file $BLOB_FILE &&
 	test-chmtime =+0 $BLOB_FILE
 }
 
@@ -35,9 +35,9 @@ test_expect_success 'prune stale packs' '
 	: > .git/objects/tmp_2.pack &&
 	test-chmtime =-86501 .git/objects/tmp_1.pack &&
 	git prune --expire 1.day &&
-	test -f $orig_pack &&
-	test -f .git/objects/tmp_2.pack &&
-	! test -f .git/objects/tmp_1.pack
+	test_path_is_file $orig_pack &&
+	test_path_is_file .git/objects/tmp_2.pack &&
+	test_path_is_missing .git/objects/tmp_1.pack
 
 '
 
@@ -45,12 +45,12 @@ test_expect_success 'prune --expire' '
 
 	add_blob &&
 	git prune --expire=1.hour.ago &&
-	test $((1 + $before)) = $(git count-objects | sed "s/ .*//") &&
-	test -f $BLOB_FILE &&
+	verbose test $((1 + $before)) = $(git count-objects | sed "s/ .*//") &&
+	test_path_is_file $BLOB_FILE &&
 	test-chmtime =-86500 $BLOB_FILE &&
 	git prune --expire 1.day &&
-	test $before = $(git count-objects | sed "s/ .*//") &&
-	! test -f $BLOB_FILE
+	verbose test $before = $(git count-objects | sed "s/ .*//") &&
+	test_path_is_missing $BLOB_FILE
 
 '
 
@@ -59,12 +59,12 @@ test_expect_success 'gc: implicit prune --expire' '
 	add_blob &&
 	test-chmtime =-$((2*$week-30)) $BLOB_FILE &&
 	git gc &&
-	test $((1 + $before)) = $(git count-objects | sed "s/ .*//") &&
-	test -f $BLOB_FILE &&
+	verbose test $((1 + $before)) = $(git count-objects | sed "s/ .*//") &&
+	test_path_is_file $BLOB_FILE &&
 	test-chmtime =-$((2*$week+1)) $BLOB_FILE &&
 	git gc &&
-	test $before = $(git count-objects | sed "s/ .*//") &&
-	! test -f $BLOB_FILE
+	verbose test $before = $(git count-objects | sed "s/ .*//") &&
+	test_path_is_missing $BLOB_FILE
 
 '
 
@@ -110,7 +110,7 @@ test_expect_success 'prune: do not prune detached HEAD with no reflog' '
 	git commit --allow-empty -m "detached commit" &&
 	# verify that there is no reflogs
 	# (should be removed and disabled by previous test)
-	test ! -e .git/logs &&
+	test_path_is_missing .git/logs &&
 	git prune -n >prune_actual &&
 	: >prune_expected &&
 	test_cmp prune_actual prune_expected
@@ -144,8 +144,8 @@ test_expect_success 'gc --no-prune' '
 	test-chmtime =-$((5001*$day)) $BLOB_FILE &&
 	git config gc.pruneExpire 2.days.ago &&
 	git gc --no-prune &&
-	test 1 = $(git count-objects | sed "s/ .*//") &&
-	test -f $BLOB_FILE
+	verbose test 1 = $(git count-objects | sed "s/ .*//") &&
+	test_path_is_file $BLOB_FILE
 
 '
 
@@ -153,10 +153,10 @@ test_expect_success 'gc respects gc.pruneExpire' '
 
 	git config gc.pruneExpire 5002.days.ago &&
 	git gc &&
-	test -f $BLOB_FILE &&
+	test_path_is_file $BLOB_FILE &&
 	git config gc.pruneExpire 5000.days.ago &&
 	git gc &&
-	test ! -f $BLOB_FILE
+	test_path_is_missing $BLOB_FILE
 
 '
 
@@ -165,9 +165,9 @@ test_expect_success 'gc --prune=<date>' '
 	add_blob &&
 	test-chmtime =-$((5001*$day)) $BLOB_FILE &&
 	git gc --prune=5002.days.ago &&
-	test -f $BLOB_FILE &&
+	test_path_is_file $BLOB_FILE &&
 	git gc --prune=5000.days.ago &&
-	test ! -f $BLOB_FILE
+	test_path_is_missing $BLOB_FILE
 
 '
 
@@ -175,9 +175,9 @@ test_expect_success 'gc --prune=never' '
 
 	add_blob &&
 	git gc --prune=never &&
-	test -f $BLOB_FILE &&
+	test_path_is_file $BLOB_FILE &&
 	git gc --prune=now &&
-	test ! -f $BLOB_FILE
+	test_path_is_missing $BLOB_FILE
 
 '
 
@@ -186,10 +186,10 @@ test_expect_success 'gc respects gc.pruneExpire=never' '
 	git config gc.pruneExpire never &&
 	add_blob &&
 	git gc &&
-	test -f $BLOB_FILE &&
+	test_path_is_file $BLOB_FILE &&
 	git config gc.pruneExpire now &&
 	git gc &&
-	test ! -f $BLOB_FILE
+	test_path_is_missing $BLOB_FILE
 
 '
 
@@ -197,9 +197,9 @@ test_expect_success 'prune --expire=never' '
 
 	add_blob &&
 	git prune --expire=never &&
-	test -f $BLOB_FILE &&
+	test_path_is_file $BLOB_FILE &&
 	git prune &&
-	test ! -f $BLOB_FILE
+	test_path_is_missing $BLOB_FILE
 
 '
 
@@ -209,11 +209,11 @@ test_expect_success 'gc: prune old objects after local clone' '
 	git clone --no-hardlinks . aclone &&
 	(
 		cd aclone &&
-		test 1 = $(git count-objects | sed "s/ .*//") &&
-		test -f $BLOB_FILE &&
+		verbose test 1 = $(git count-objects | sed "s/ .*//") &&
+		test_path_is_file $BLOB_FILE &&
 		git gc --prune &&
-		test 0 = $(git count-objects | sed "s/ .*//") &&
-		! test -f $BLOB_FILE
+		verbose test 0 = $(git count-objects | sed "s/ .*//") &&
+		test_path_is_missing $BLOB_FILE
 	)
 '
 
@@ -250,7 +250,7 @@ test_expect_success 'prune .git/shallow' '
 	grep $SHA1 .git/shallow &&
 	grep $SHA1 out &&
 	git prune &&
-	! test -f .git/shallow
+	test_path_is_missing .git/shallow
 '
 
 test_done
diff --git a/t/test-lib-functions.sh b/t/test-lib-functions.sh
index dafd6ad21a..b7957b87bb 100644
--- a/t/test-lib-functions.sh
+++ b/t/test-lib-functions.sh
@@ -634,6 +634,15 @@ test_cmp_bin() {
 	cmp "$@"
 }
 
+# Call any command "$@" but be more verbose about its
+# failure. This is handy for commands like "test" which do
+# not output anything when they fail.
+verbose () {
+	"$@" && return 0
+	echo >&2 "command failed: $(git rev-parse --sq-quote "$@")"
+	return 1
+}
+
 # Check if the file expected to be empty is indeed empty, and barfs
 # otherwise.
 
diff --git a/t/test-lib.sh b/t/test-lib.sh
index 0f4a67bfc6..cf19339cce 100644
--- a/t/test-lib.sh
+++ b/t/test-lib.sh
@@ -233,6 +233,10 @@ do
 	--root=*)
 		root=$(expr "z$1" : 'z[^=]*=\(.*\)')
 		shift ;;
+	-x)
+		trace=t
+		verbose=t
+		shift ;;
 	*)
 		echo "error: unknown test option '$1'" >&2; exit 1 ;;
 	esac
@@ -517,10 +521,39 @@ maybe_setup_valgrind () {
 	fi
 }
 
+# This is a separate function because some tests use
+# "return" to end a test_expect_success block early
+# (and we want to make sure we run any cleanup like
+# "set +x").
+test_eval_inner_ () {
+	# Do not add anything extra (including LF) after '$*'
+	eval "
+		test \"$trace\" = t && set -x
+		$*"
+}
+
 test_eval_ () {
-	# This is a separate function because some tests use
-	# "return" to end a test_expect_success block early.
-	eval </dev/null >&3 2>&4 "$*"
+	# We run this block with stderr redirected to avoid extra cruft
+	# during a "-x" trace. Once in "set -x" mode, we cannot prevent
+	# the shell from printing the "set +x" to turn it off (nor the saving
+	# of $? before that). But we can make sure that the output goes to
+	# /dev/null.
+	#
+	# The test itself is run with stderr put back to &4 (so either to
+	# /dev/null, or to the original stderr if --verbose was used).
+	{
+		test_eval_inner_ "$@" </dev/null >&3 2>&4
+		test_eval_ret_=$?
+		if test "$trace" = t
+		then
+			set +x
+			if test "$test_eval_ret_" != 0
+			then
+				say_color error >&4 "error: last command exited with \$?=$test_eval_ret_"
+			fi
+		fi
+	} 2>/dev/null
+	return $test_eval_ret_
 }
 
 test_run_ () {
@@ -531,7 +564,8 @@ test_run_ () {
 	eval_ret=$?
 	teardown_malloc_check
 
-	if test -z "$immediate" || test $eval_ret = 0 || test -n "$expecting_failure"
+	if test -z "$immediate" || test $eval_ret = 0 ||
+	   test -n "$expecting_failure" && test "$test_cleanup" != ":"
 	then
 		setup_malloc_check
 		test_eval_ "$test_cleanup"