Add test case checking renaming of a branch to a new name prefixed with

the old name succeeds, e.g. refs/heads/foo -> refs/heads/foo/bar

Reported-by: nulltoken <emeric.fermas@gmail.com>
Signed-off-by: schu <schu-github@schulog.org>

tests/t10-refs.c

@@ -686,6 +686,37 @@ BEGIN_TEST(rename6, "can not overwrite name of existing reference")
 	close_temp_repo(repo);
 END_TEST
 
+static const char *ref_two_name_new = "refs/heads/two/two";
+
+BEGIN_TEST(rename7, "can be renamed to a new name prefixed with the old name")
+	git_reference *ref, *ref_two, *looked_up_ref;
+	git_repository *repo;
+	git_oid id;
+
+	must_pass(open_temp_repo(&repo, REPOSITORY_FOLDER));
+
+	must_pass(git_reference_lookup(&ref, repo, ref_master_name));
+	must_be_true(ref->type & GIT_REF_OID);
+
+	git_oid_cpy(&id, git_reference_oid(ref));
+
+	/* Create loose references */
+	must_pass(git_reference_create_oid(&ref_two, repo, ref_two_name, &id));
+
+	/* An existing reference... */
+	must_pass(git_reference_lookup(&looked_up_ref, repo, ref_two_name));
+
+	/* Can be rename to a new name starting with the old name. */
+	must_pass(git_reference_rename(looked_up_ref, ref_two_name_new));
+
+	/* Check we actually renamed it */
+	must_pass(git_reference_lookup(&looked_up_ref, repo, ref_two_name_new));
+	must_be_true(!strcmp(looked_up_ref->name, ref_two_name_new));
+	must_fail(git_reference_lookup(&looked_up_ref, repo, ref_two_name));
+
+	close_temp_repo(repo);
+END_TEST
+
 BEGIN_TEST(delete0, "deleting a ref which is both packed and loose should remove both tracks in the filesystem")
 	git_reference *looked_up_ref, *another_looked_up_ref;
 	git_repository *repo;
@@ -968,6 +999,7 @@ BEGIN_SUITE(refs)
 	ADD_TEST(rename4);
 	ADD_TEST(rename5);
 	ADD_TEST(rename6);
+	ADD_TEST(rename7);
 
 	ADD_TEST(delete0);
 	ADD_TEST(list0);