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-rwxr-xr-xt/t4044-diff-index-unique-abbrev.sh35
1 files changed, 35 insertions, 0 deletions
diff --git a/t/t4044-diff-index-unique-abbrev.sh b/t/t4044-diff-index-unique-abbrev.sh
new file mode 100755
index 0000000000..d5ce72be63
--- /dev/null
+++ b/t/t4044-diff-index-unique-abbrev.sh
@@ -0,0 +1,35 @@
+#!/bin/sh
+
+test_description='test unique sha1 abbreviation on "index from..to" line'
+. ./test-lib.sh
+
+cat >expect_initial <<EOF
+100644 blob 51d2738463ea4ca66f8691c91e33ce64b7d41bb1 foo
+EOF
+
+cat >expect_update <<EOF
+100644 blob 51d2738efb4ad8a1e40bed839ab8e116f0a15e47 foo
+EOF
+
+test_expect_success 'setup' '
+ echo 4827 > foo &&
+ git add foo &&
+ git commit -m "initial" &&
+ git cat-file -p HEAD: > actual &&
+ test_cmp expect_initial actual &&
+ echo 11742 > foo &&
+ git commit -a -m "update" &&
+ git cat-file -p HEAD: > actual &&
+ test_cmp expect_update actual
+'
+
+cat >expect <<EOF
+index 51d27384..51d2738e 100644
+EOF
+
+test_expect_success 'diff does not produce ambiguous index line' '
+ git diff HEAD^..HEAD | grep index > actual &&
+ test_cmp expect actual
+'
+
+test_done