test: unit tests of css

Author: sxzz

tests/__snapshots__/css/basic.snap.md

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+## index.css
+
+```css
+body { color: red }
+
+```
+## index.js
+
+```js
+export {  };
+```

tests/__snapshots__/css/unbundle.snap.md

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+## index.js
+
+```js
+import "./style.js";
+
+export {  };
+```
+## style-CDacwehR.css
+
+```css
+body { color: red }
+
+```
+## style.js
+
+```js
+export {  };
+```

tests/__snapshots__/css/with-dts.snap.md

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+## style.css
+
+```css
+body { color: red }
+
+```
+## style.js
+
+```js
+export {  };
+```

tests/css.test.ts

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+import { describe, expect, test } from 'vitest'
+import { testBuild } from './utils'
+
+describe('css', () => {
+  test('basic', async (context) => {
+    const { outputFiles } = await testBuild({
+      context,
+      files: {
+        'index.ts': `import './style.css'`,
+        'style.css': `body { color: red }`,
+      },
+    })
+    expect(outputFiles).toEqual(['index.css', 'index.js'])
+  })
+
+  test.fails('unbundle', async (context) => {
+    const { outputFiles } = await testBuild({
+      context,
+      files: {
+        'index.ts': `import './style.css'`,
+        'style.css': `body { color: red }`,
+      },
+      options: {
+        unbundle: true,
+      },
+    })
+    expect(outputFiles).toEqual(['index.js', 'style.js', 'style.css'])
+  })
+
+  test.fails('with dts', async (context) => {
+    const { outputFiles } = await testBuild({
+      context,
+      files: {
+        'style.css': `body { color: red }`,
+      },
+      options: {
+        entry: ['style.css'],
+        dts: true,
+      },
+    })
+    expect(outputFiles).toEqual(['style.css', 'style.js', 'style.d.ts'])
+  })
+})