chore(test): give chunks names (#478)

to make filenames consistent between webpack versions

Author: sokra

test/cases/composes-async/expected/2.css renamed to test/cases/composes-async/expected/async-1.css

@@ -1,2 +1,2 @@
-import('./async-1.css');
-import('./async-2.css');
+import(/* webpackChunkName: "async-1" */ './async-1.css');
+import(/* webpackChunkName: "async-2" */ './async-2.css');

test/cases/composes-async/expected/1.css renamed to test/cases/composes-async/expected/dedupe.css

@@ -25,6 +25,7 @@ module.exports = {
       cacheGroups: {
         cssDedupe: {
           test: /\.css$/,
+          name: 'dedupe',
           chunks: 'all',
           minChunks: 2,
           enforce: true,