submodule.c: report the submodule that an error occurs in

diff --git a/t/t7001-mv.sh b/t/t7001-mv.sh
index 6e5031f56fb4f211e0ba43911d4495b1bb0b5b62..d4e6485a26eef8985856413a1bf977c95f6ec345 100755 (executable)
--- a/t/t7001-mv.sh
+++ b/t/t7001-mv.sh
@@ -38,6 +38,12 @@ test_expect_success \
     'git diff-tree -r -M --name-status  HEAD^ HEAD | \
     grep "^R100..*path1/COPYING..*path0/COPYING"'
 
+test_expect_success \
+    'mv --dry-run does not move file' \
+    'git mv -n path0/COPYING MOVED &&
+     test -f path0/COPYING &&
+     test ! -f MOVED'
+
 test_expect_success \
     'checking -k on non-existing file' \
     'git mv -k idontexist path0'