Allow mocha to use webpack aliasses via babel

js/.babelrc

@@ -16,6 +16,15 @@
     },
     "development": {
       "plugins": ["react-hot-loader/babel"]
+    },
+    "test": {
+      "plugins": [
+        [
+          "babel-plugin-webpack-alias", {
+            "config": "webpack/test.js"
+          }
+        ]
+      ]
     }
   }
 }

js/package.json

@@ -40,7 +40,7 @@
     "coveralls": "npm run testCoverage && coveralls < coverage/lcov.info",
     "lint": "eslint --ignore-path .gitignore ./src/",
     "lint:cached": "eslint --cache --ignore-path .gitignore ./src/",
-    "test": "mocha 'src/**/*.spec.js'",
+    "test": "NODE_ENV=test mocha 'src/**/*.spec.js'",
     "test:coverage": "istanbul cover _mocha -- 'src/**/*.spec.js'",
     "test:e2e": "mocha 'src/**/*.e2e.js'",
     "test:npm": "(cd .npmjs && npm i) && node test/npmLibrary && (rm -rf .npmjs/node_modules)",
@@ -56,6 +56,7 @@
     "babel-plugin-transform-decorators-legacy": "1.3.4",
     "babel-plugin-transform-react-remove-prop-types": "0.2.11",
     "babel-plugin-transform-runtime": "6.15.0",
+    "babel-plugin-webpack-alias": "2.1.2",
     "babel-polyfill": "6.16.0",
     "babel-preset-es2015": "6.18.0",
     "babel-preset-es2015-rollup": "1.2.0",

js/webpack/test.js

@@ -0,0 +1,26 @@
+// Copyright 2015, 2016 Ethcore (UK) Ltd.
+// This file is part of Parity.
+
+// Parity is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// Parity is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with Parity.  If not, see <http://www.gnu.org/licenses/>.
+
+const path = require('path');
+
+module.exports = {
+  context: path.join(__dirname, '../src'),
+  resolve: {
+    alias: {
+      '~': path.resolve(__dirname, '../src')
+    }
+  }
+};