tests: more git_repository_head_detached() coverage

tests-clar/repo/head.c

@@ -177,3 +177,12 @@ void test_repo_head__retrieving_an_orphaned_head_returns_GIT_EORPHANEDHEAD(void)
 
 	cl_assert_equal_i(GIT_EORPHANEDHEAD, git_repository_head(&head, repo));
 }
+
+void test_repo_head__can_tell_if_an_orphaned_head_is_detached(void)
+{
+	git_reference *head;
+
+	make_head_orphaned(repo, NON_EXISTING_HEAD);
+
+	cl_assert_equal_i(false, git_repository_head_detached(repo));
+}