rm: better document side effects when removing a submodule

diff --git a/t/t3600-rm.sh b/t/t3600-rm.sh
index 540c49bab618ffb75dd789b098ef982634648f7c..3d305814b9d755a827d27ed9036ebb2f8d48abe6 100755 (executable)
--- a/t/t3600-rm.sh
+++ b/t/t3600-rm.sh
@@ -705,6 +705,22 @@ test_expect_success 'rm of a populated nested submodule with a nested .git direc
        rm -rf submod
 '
 
+test_expect_success 'checking out a commit after submodule removal needs manual updates' '
+       git commit -m "submodule removal" submod &&
+       git checkout HEAD^ &&
+       git submodule update &&
+       git checkout -q HEAD^ 2>actual &&
+       git checkout -q master 2>actual &&
+       echo "warning: unable to rmdir submod: Directory not empty" >expected &&
+       test_i18ncmp expected actual &&
+       git status -s submod >actual &&
+       echo "?? submod/" >expected &&
+       test_cmp expected actual &&
+       rm -rf submod &&
+       git status -s -uno --ignore-submodules=none > actual &&
+       ! test -s actual
+'
+
 test_expect_success 'rm of d/f when d has become a non-directory' '
        rm -rf d &&
        mkdir d &&