push: test pushing ambiguously named branches

Signed-off-by: Dennis Kaarsemaker <dennis@kaarsemaker.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/t5528-push-default.sh

@@ -98,6 +98,16 @@ test_expect_success 'push from/to new branch with upstream, matching and simple'
 	test_push_failure upstream
 '
 
+test_expect_success 'push ambiguously named branch with upstream, matching and simple' '
+	git checkout -b ambiguous &&
+	test_config branch.ambiguous.remote parent1 &&
+	test_config branch.ambiguous.merge refs/heads/ambiguous &&
+	git tag ambiguous &&
+	test_push_success simple ambiguous &&
+	test_push_success matching ambiguous &&
+	test_push_success upstream ambiguous
+'
+
 test_expect_success 'push from/to new branch with current creates remote branch' '
 	test_config branch.new-branch.remote repo1 &&
 	git checkout new-branch &&