t7605: add a testcase demonstrating a bug with trivial merges

diff --git a/t/t7605-merge-resolve.sh b/t/t7605-merge-resolve.sh
index 0cb9d11f2171de19b260391017310f0ee792f89b..2f80037c9a814e5a1de266843d7eedfa37fd0b6a 100755 (executable)
--- a/t/t7605-merge-resolve.sh
+++ b/t/t7605-merge-resolve.sh
@@ -27,7 +27,7 @@ test_expect_success 'setup' '
        git tag c3
 '
 
-test_expect_success 'merge c1 to c2' '
+merge_c1_to_c2_cmds='
        git reset --hard c1 &&
        git merge -s resolve c2 &&
        test "$(git rev-parse c1)" != "$(git rev-parse HEAD)" &&
@@ -41,6 +41,10 @@ test_expect_success 'merge c1 to c2' '
        test 3 = $(git ls-files | wc -l)
 '
 
+test_expect_success 'merge c1 to c2'        "$merge_c1_to_c2_cmds"
+
+test_expect_failure 'merge c1 to c2, again' "$merge_c1_to_c2_cmds"
+
 test_expect_success 'merge c2 to c3 (fails)' '
        git reset --hard c2 &&
        test_must_fail git merge -s resolve c3