1 files changed, 92 insertions, 0 deletions
diff --git a/third_party/git/t/t4000-diff-format.sh b/third_party/git/t/t4000-diff-format.sh
new file mode 100755
index 000000000000..8de36b7d1222
--- /dev/null
+++ b/third_party/git/t/t4000-diff-format.sh
@@ -0,0 +1,92 @@
+#!/bin/sh
+#
+# Copyright (c) 2005 Junio C Hamano
+#
+
+test_description='Test built-in diff output engine.
+
+'
+. ./test-lib.sh
+. "$TEST_DIRECTORY"/diff-lib.sh
+
+echo >path0 'Line 1
+Line 2
+line 3'
+cat path0 >path1
+chmod +x path1
+
+test_expect_success 'update-index --add two files with and without +x.' '
+	git update-index --add path0 path1
+'
+
+mv path0 path0-
+sed -e 's/line/Line/' <path0- >path0
+chmod +x path0
+rm -f path1
+test_expect_success 'git diff-files -p after editing work tree.' '
+	git diff-files -p >actual
+'
+
+# that's as far as it comes
+if [ "$(git config --get core.filemode)" = false ]
+then
+	say 'filemode disabled on the filesystem'
+	test_done
+fi
+
+cat >expected <<\EOF
+diff --git a/path0 b/path0
+old mode 100644
+new mode 100755
+--- a/path0
++++ b/path0
+@@ -1,3 +1,3 @@
+ Line 1
+ Line 2
+-line 3
++Line 3
+diff --git a/path1 b/path1
+deleted file mode 100755
+--- a/path1
++++ /dev/null
+@@ -1,3 +0,0 @@
+-Line 1
+-Line 2
+-line 3
+EOF
+
+test_expect_success 'validate git diff-files -p output.' '
+	compare_diff_patch expected actual
+'
+
+test_expect_success 'git diff-files -s after editing work tree' '
+	git diff-files -s >actual 2>err &&
+	test_must_be_empty actual &&
+	test_must_be_empty err
+'
+
+test_expect_success 'git diff-files --no-patch as synonym for -s' '
+	git diff-files --no-patch >actual 2>err &&
+	test_must_be_empty actual &&
+	test_must_be_empty err
+'
+
+test_expect_success 'git diff-files --no-patch --patch shows the patch' '
+	git diff-files --no-patch --patch >actual &&
+	compare_diff_patch expected actual
+'
+
+test_expect_success 'git diff-files --no-patch --patch-with-raw shows the patch and raw data' '
+	git diff-files --no-patch --patch-with-raw >actual &&
+	grep -q "^:100644 100755 .* 0000000000000000000000000000000000000000 M	path0\$" actual &&
+	tail -n +4 actual >actual-patch &&
+	compare_diff_patch expected actual-patch
+'
+
+test_expect_success 'git diff-files --patch --no-patch does not show the patch' '
+	git diff-files --patch --no-patch >actual 2>err &&
+	test_must_be_empty actual &&
+	test_must_be_empty err
+'
+
+test_done