test: test case for compose/from path resolution

packages/vite/src/node/__tests__/plugins/css.spec.ts

@@ -1,4 +1,7 @@
-import { cssUrlRE } from '../../plugins/css'
+import { cssUrlRE, cssPlugin } from '../../plugins/css'
+import { resolveConfig } from '../../config'
+import fs from 'fs'
+import path from 'path'
 
 describe('search css url function', () => {
   test('some spaces before it', () => {
@@ -41,3 +44,71 @@ describe('search css url function', () => {
     ).toBe(true)
   })
 })
+
+describe('css path resolutions', () => {
+  const mockedProjectPath = '/foo/bar/project'
+  const mockedBarCssRelativePath = '/css/bar.module.css'
+  const mockedFooCssRelativePath = '/css/foo.module.css'
+
+  test('cssmodule compose/from path resolutions', async () => {
+    const config = await resolveConfig(
+      {
+        resolve: {
+          alias: [
+            {
+              find: '@',
+              replacement: mockedProjectPath
+            }
+          ]
+        }
+      },
+      'serve'
+    )
+
+    const { transform, buildStart } = cssPlugin(config)
+
+    await buildStart.call({})
+
+    const mockFs = jest
+      .spyOn(fs, 'readFile')
+      // @ts-ignore jest.spyOn not recognize overrided `fs.readFile` definition.
+      .mockImplementationOnce((p, encoding, callback) => {
+        expect(p).toBe(path.join(mockedProjectPath, mockedBarCssRelativePath))
+        expect(encoding).toBe('utf-8')
+        callback(
+          null,
+          Buffer.from(`
+.bar {
+  display: block;
+  background: #f0f;
+}
+      `)
+        )
+      })
+
+    const { code } = await transform.call(
+      {
+        addWatchFile() {
+          return
+        }
+      },
+      `
+.foo {
+  composes: bar from '@${mockedBarCssRelativePath}';
+}
+    `,
+      path.join(mockedProjectPath, mockedFooCssRelativePath)
+    )
+
+    expect(code).toBe(`
+._bar_soicv_2 {
+  display: block;
+  background: #f0f;
+}
+._foo_ede2y_2 {
+}
+    `)
+
+    mockFs.mockReset()
+  })
+})