ci: add rules for test env

packages/xpub-faraday/webpack/rules.test.js

+const ExtractTextPlugin = require('extract-text-webpack-plugin')
+const include = require('./babel-includes')
+const stringReplaceRule = require('./string-replace')
+
+module.exports = [
+  stringReplaceRule,
+  {
+    oneOf: [
+      // ES6 JS
+      {
+        test: /\.jsx?$/,
+        include,
+        loader: 'babel-loader',
+        options: {
+          presets: [
+            [require('babel-preset-env'), { modules: false }],
+            require('babel-preset-react'),
+            require('babel-preset-stage-2'),
+          ],
+        },
+      },
+
+      // CSS Modules
+      {
+        test: /\.local\.css$/,
+        include,
+        use: ExtractTextPlugin.extract({
+          fallback: 'style-loader',
+          use: [
+            {
+              loader: 'css-loader',
+              options: {
+                modules: true,
+                localIdentName: '[name]_[local]-[hash:base64:8]',
+              },
+            },
+          ],
+        }),
+      },
+
+      // global CSS
+      {
+        test: /\.css$/,
+        use: ExtractTextPlugin.extract({
+          fallback: 'style-loader',
+          use: ['css-loader'],
+        }),
+      },
+
+      // files
+      {
+        exclude: [/\.jsx?$/, /\.html$/, /\.json$/],
+        loader: 'file-loader',
+        options: {
+          name: 'static/media/[name].[hash:8].[ext]',
+        },
+      },
+    ],
+  },
+]