t6042: Add failing testcase for rename/modify/add-source conflict

If there is a cleanly resolvable rename/modify conflict AND there is a new
file introduced on the renamed side of the merge whose name happens to
match that of the source of the rename (but is otherwise unrelated to the
rename), then git fails to cleanly resolve the merge despite the fact that
the new file should not cause any problems.

Signed-off-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/t/t6042-merge-rename-corner-cases.sh b/t/t6042-merge-rename-corner-cases.sh
index 5054459987254239a004dce5616779db99f8852a..276d7dd2d7494e51a34f7e189aba3d3dc12492e5 100755 (executable)
--- a/t/t6042-merge-rename-corner-cases.sh
+++ b/t/t6042-merge-rename-corner-cases.sh
@@ -33,4 +33,43 @@ test_expect_failure "Does git preserve Gollum's precious artifact?" '
        test -f ring
 '
 
+# Testcase setup for rename/modify/add-source:
+#   Commit A: new file: a
+#   Commit B: modify a slightly
+#   Commit C: rename a->b, add completely different a
+#
+# We should be able to merge B & C cleanly
+
+test_expect_success 'setup rename/modify/add-source conflict' '
+       git rm -rf . &&
+       git clean -fdqx &&
+       rm -rf .git &&
+       git init &&
+
+       printf "1\n2\n3\n4\n5\n6\n7\n" >a &&
+       git add a &&
+       git commit -m A &&
+       git tag A &&
+
+       git checkout -b B A &&
+       echo 8 >>a &&
+       git add a &&
+       git commit -m B &&
+
+       git checkout -b C A &&
+       git mv a b &&
+       echo something completely different >a &&
+       git add a &&
+       git commit -m C
+'
+
+test_expect_failure 'rename/modify/add-source conflict resolvable' '
+       git checkout B^0 &&
+
+       git merge -s recursive C^0 &&
+
+       test $(git rev-parse B:a) = $(git rev-parse b) &&
+       test $(git rev-parse C:a) = $(git rev-parse a)
+'
+
 test_done