test(config): run the hook install test against its own clone (#1800)

Author: FelixTJDietrich

scripts/enable-hooks.test.ts

@@ -11,6 +11,15 @@ const REPO_ROOT = resolve(import.meta.dirname, "..");
 const SCRIPT = join(REPO_ROOT, "scripts", "enable-hooks.ts");
 const repositories: string[] = [];
 
+/**
+ * Git exports `GIT_DIR` and its siblings to every hook process, and they outrank a child's `cwd`.
+ * Inherited, they would point both the script under test and the assertions at the repository the
+ * hook is running in rather than at the clone made below.
+ */
+const ENV = Object.fromEntries(
+	Object.entries(process.env).filter(([key]) => !key.startsWith("GIT_")),
+);
+
 after(() => {
 	for (const repository of repositories) rmSync(repository, { recursive: true, force: true });
 });
@@ -24,9 +33,7 @@ function clone(): { repository: string; git: (...args: string[]) => string } {
 			cwd: repository,
 			encoding: "utf8",
 			maxBuffer: CAPTURE_LIMIT_BYTES,
-			env: Object.fromEntries(
-				Object.entries(process.env).filter(([key]) => !key.startsWith("GIT_")),
-			),
+			env: ENV,
 		}).trim();
 	git("init", "--quiet");
 	git("config", "core.hooksPath", ".husky/_");
@@ -40,10 +47,11 @@ void test("an install moves Git from an earlier hooks directory to the dispatche
 		cwd: repository,
 		encoding: "utf8",
 		maxBuffer: CAPTURE_LIMIT_BYTES,
+		env: ENV,
 	});
 	assert.equal(result.status, 0, `${result.stdout}${result.stderr}`);
 	assert.equal(git("config", "core.hooksPath"), ".vite-hooks/_");
-	const again = spawnSync("node", [SCRIPT], { cwd: repository, encoding: "utf8" });
+	const again = spawnSync("node", [SCRIPT], { cwd: repository, encoding: "utf8", env: ENV });
 	assert.equal(again.status, 0, `${again.stdout}${again.stderr}`);
 	assert.equal(git("config", "core.hooksPath"), ".vite-hooks/_");
 });