test: clean up (webpack-contrib#780)

Author: alexander-akait

test/cases/asset-modules/test.filter.js

@@ -1,5 +1,3 @@
-import { version as webpackVersion } from 'webpack';
-
 import Self from '../../../src';
 
 module.exports = {
@@ -15,10 +13,7 @@ module.exports = {
   plugins: [
     new Self({
       filename: '[name].css',
-      chunkFilename:
-        webpackVersion[0] === '4'
-          ? '[id].[name].css'
-          : ({ chunk }) => `${chunk.id}.${chunk.name}.css`,
+      chunkFilename: ({ chunk }) => `${chunk.id}.${chunk.name}.css`,
     }),
   ],
 };

test/cases/chunkFilename-as-function/webpack.config.js

@@ -1,18 +1,13 @@
-import { version as webpackVersion } from 'webpack';
-
 import Self from '../../../src';
 
 function recursiveIssuer(m, c) {
-  const issuer =
-    webpackVersion[0] === '4' ? m.issuer : c.moduleGraph.getIssuer(m);
+  const issuer = c.moduleGraph.getIssuer(m);
 
   if (issuer) {
     return recursiveIssuer(issuer, c);
   }
 
-  const chunks =
-    // eslint-disable-next-line no-underscore-dangle
-    webpackVersion[0] === '4' ? m._chunks : c.chunkGraph.getModuleChunks(m);
+  const chunks = c.chunkGraph.getModuleChunks(m);
 
   for (const chunk of chunks) {
     return chunk.name;