ci: fix css rules test

Author: yyx990803

packages/@vue/cli-service/__tests__/css.spec.js

@@ -133,8 +133,10 @@ test('css.extract', () => {
     // does not support mixing config files with loader options.
     expect(findLoaders(config2, lang)).toEqual(['vue-style', 'css', 'postcss', 'postcss'].concat(loader))
     expect(findOptions(config2, lang, 'css').importLoaders).toBe(3)
-    // minification loader should be injected before the user-facing postcss-loader
-    expect(findOptions(config2, lang, 'postcss').plugins).toBeTruthy()
+    // minification loader should be injected after the user-facing postcss-loader
+    const rule = findRule(config2, lang)
+    const postcssUse = rule.use.slice().reverse().find(({ loader }) => loader === 'postcss-loader')
+    expect(postcssUse.options.plugins).toBeTruthy()
   })
 })
 

packages/@vue/cli-service/package.json

@@ -63,7 +63,7 @@
     "thread-loader": "^1.1.5",
     "uglifyjs-webpack-plugin": "^1.2.7",
     "url-loader": "^1.1.0",
-    "vue-loader": "^15.3.0",
+    "vue-loader": "^15.4.2",
     "webpack": "^4.15.1",
     "webpack-bundle-analyzer": "^2.13.1",
     "webpack-chain": "^4.8.0",