t6030: add a bit more tests to git-bisect

diff --git a/t/t5300-pack-object.sh b/t/t5300-pack-object.sh
index eacb1e92c20bf0efef069ff5ec0af792f95b1252..35e036a86465ce066b3e3a5f98c769fba6cd4276 100755 (executable)
--- a/t/t5300-pack-object.sh
+++ b/t/t5300-pack-object.sh
@@ -255,4 +255,14 @@ test_expect_success \
 
      :'
 
+test_expect_success \
+    'fake a SHA1 hash collision' \
+    'test -f   .git/objects/c8/2de19312b6c3695c0c18f70709a6c535682a67 &&
+     cp -f     .git/objects/9d/235ed07cd19811a6ceb342de82f190e49c9f68 \
+               .git/objects/c8/2de19312b6c3695c0c18f70709a6c535682a67'
+
+test_expect_failure \
+    'make sure index-pack detects the SHA1 collision' \
+    'git-index-pack -o bad.idx test-3.pack'
+
 test_done