1 files changed, 80 insertions, 0 deletions
diff --git a/t/t4001-diff-rename.sh b/t/t4001-diff-rename.sh
new file mode 100755
index 0000000000..a32692417d
--- /dev/null
+++ b/t/t4001-diff-rename.sh
@@ -0,0 +1,80 @@
+#!/bin/sh
+#
+# Copyright (c) 2005 Junio C Hamano
+#
+
+test_description='Test rename detection in diff engine.
+
+'
+. ./test-lib.sh
+. ../diff-lib.sh
+
+echo >path0 'Line 1
+Line 2
+Line 3
+Line 4
+Line 5
+Line 6
+Line 7
+Line 8
+Line 9
+Line 10
+line 11
+Line 12
+Line 13
+Line 14
+Line 15
+'
+
+test_expect_success \
+    'update-index --add a file.' \
+    'git update-index --add path0'
+
+test_expect_success \
+    'write that tree.' \
+    'tree=$(git write-tree) && echo $tree'
+
+sed -e 's/line/Line/' <path0 >path1
+rm -f path0
+test_expect_success \
+    'renamed and edited the file.' \
+    'git update-index --add --remove path0 path1'
+
+test_expect_success \
+    'git diff-index -p -M after rename and editing.' \
+    'git diff-index -p -M $tree >current'
+cat >expected <<\EOF
+diff --git a/path0 b/path1
+rename from path0
+rename to path1
+--- a/path0
++++ b/path1
+@@ -8,7 +8,7 @@ Line 7
+ Line 8
+ Line 9
+ Line 10
+-line 11
++Line 11
+ Line 12
+ Line 13
+ Line 14
+EOF
+
+test_expect_success \
+    'validate the output.' \
+    'compare_diff_patch current expected'
+
+test_expect_success 'favour same basenames over different ones' '
+	cp path1 another-path &&
+	git add another-path &&
+	git commit -m 1 &&
+	git rm path1 &&
+	mkdir subdir &&
+	git mv another-path subdir/path1 &&
+	git status | grep "renamed: .*path1 -> subdir/path1"'
+
+test_expect_success  'favour same basenames even with minor differences' '
+	git show HEAD:path1 | sed "s/15/16/" > subdir/path1 &&
+	git status | grep "renamed: .*path1 -> subdir/path1"'
+
+test_done