test_expect_success \
'make sure index-pack detects the SHA1 collision' \
- 'test_must_fail git index-pack -o bad.idx test-3.pack'
+ 'test_must_fail git index-pack -o bad.idx test-3.pack 2>msg &&
+ grep "SHA1 COLLISION FOUND" msg'
test_expect_success \
'honor pack.packSizeLimit' \