feat: add test

Author: ryoppippi

tests/assets/class.module.css

@@ -0,0 +1,6 @@
+.error {
+	color: red;
+}
+.success {
+	color: green;
+}

tests/assets/style.module.css

@@ -0,0 +1,9 @@
+section {
+	padding: 10px;
+}
+.error {
+	color: red;
+}
+.success-message {
+	color: green;
+}

tests/compiler.ts

@@ -0,0 +1,21 @@
+import path from 'node:path';
+import { preprocess } from 'svelte/compiler';
+import { cssModules } from '../src';
+
+type Params = {
+	source: string;
+	preprocessOptions: Parameters<typeof preprocess>[2];
+};
+
+export async function compiler({
+	source,
+	preprocessOptions,
+}: Params) {
+	const { code } = await preprocess(
+		source,
+		[cssModules()],
+		preprocessOptions,
+	);
+
+	return code;
+};

tests/test1/Input.svelte

@@ -0,0 +1,11 @@
+<script>
+	import s from '../assets/class.module.css';
+</script>
+
+<div class={s.error}>
+	hello
+</div>
+
+<div class={s.success}>
+	world
+</div>

tests/test1/test1.spec.ts

@@ -0,0 +1,21 @@
+import fs from 'node:fs/promises';
+import path from 'node:path';
+import { expect, it } from 'vitest';
+import { compiler } from '../compiler';
+
+function resolve(file: string) {
+	return path.resolve(__dirname, file);
+}
+
+it('test0', async () => {
+	const filename = resolve('Input.svelte');
+
+	const source = await fs.readFile(filename, 'utf-8');
+
+	const code = await compiler({
+		source,
+		preprocessOptions: { filename },
+	});
+
+	await expect(code).toMatchFileSnapshot('./Output.svelte');
+});