t5510: add a bit more tests for fetch

diff --git a/t/t7400-submodule-basic.sh b/t/t7400-submodule-basic.sh
index 9d142ed649ef98adcbf7c6d158890c9f55370ef7..4fe3a41f07f2f05865b219ff00afaa5786c679d5 100755 (executable)
--- a/t/t7400-submodule-basic.sh
+++ b/t/t7400-submodule-basic.sh
@@ -152,6 +152,10 @@ test_expect_success 'the --cached sha1 should be rev1' '
        git-submodule --cached status | grep "^+$rev1"
 '
 
+test_expect_success 'git diff should report the SHA1 of the new submodule commit' '
+       git-diff | grep "^+Subproject commit $rev2"
+'
+
 test_expect_success 'update should checkout rev1' '
        git-submodule update &&
        head=$(cd lib && git rev-parse HEAD) &&