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) &&
git-checkout master
'
+test_expect_success 'apply submodule diff' '
+ git branch second &&
+ (
+ cd lib &&
+ echo s >s &&
+ git add s &&
+ git commit -m "change subproject"
+ ) &&
+ git update-index --add lib &&
+ git-commit -m "change lib" &&
+ git-format-patch -1 --stdout >P.diff &&
+ git checkout second &&
+ git apply --index P.diff &&
+ D=$(git diff --cached master) &&
+ test -z "$D"
+'
+
test_done