submodule: add a test for a renamed submdoule dir

tests/submodule/lookup.c

@@ -333,3 +333,58 @@ void test_submodule_lookup__prefix_name(void)
 
 	git_submodule_free(sm);
 }
+
+void test_submodule_lookup__renamed(void)
+{
+	const char *newpath = "sm_actually_changed";
+	git_index *idx;
+	sm_lookup_data data;
+
+	cl_git_pass(git_repository_index__weakptr(&idx, g_repo));
+
+	/* We're replicating 'git mv sm_unchanged sm_actually_changed' in this test */
+
+	cl_git_pass(p_rename("submod2/sm_unchanged", "submod2/sm_actually_changed"));
+
+	/* Change the path in .gitmodules and stage it*/
+	{
+		git_config *cfg;
+
+		cl_git_pass(git_config_open_ondisk(&cfg, "submod2/.gitmodules"));
+		cl_git_pass(git_config_set_string(cfg, "submodule.sm_unchanged.path", newpath));
+		git_config_free(cfg);
+
+		cl_git_pass(git_index_add_bypath(idx, ".gitmodules"));
+	}
+
+	/* Change the worktree info in the the submodule's config */
+	{
+		git_config *cfg;
+
+		cl_git_pass(git_config_open_ondisk(&cfg, "submod2/.git/modules/sm_unchanged/config"));
+		cl_git_pass(git_config_set_string(cfg, "core.worktree", "../../../sm_actually_changed"));
+		git_config_free(cfg);
+	}
+
+	/* Rename the entry in the index */
+	{
+		const git_index_entry *e;
+		git_index_entry entry = { 0 };
+
+		e = git_index_get_bypath(idx, "sm_unchanged", 0);
+		cl_assert(e);
+		cl_assert_equal_i(GIT_FILEMODE_COMMIT, e->mode);
+
+		entry.path = newpath;
+		entry.mode = GIT_FILEMODE_COMMIT;
+		git_oid_cpy(&entry.id, &e->id);
+
+		cl_git_pass(git_index_remove(idx, "sm_unchanged", 0));
+		cl_git_pass(git_index_add(idx, &entry));
+		cl_git_pass(git_index_write(idx));
+	}
+
+	memset(&data, 0, sizeof(data));
+	cl_git_pass(git_submodule_foreach(g_repo, sm_lookup_cb, &data));
+	cl_assert_equal_i(8, data.count);
+}