test: publicPath function

Author: karlvr

test/cases/function-publicpath/expected/main.css

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+body { background: red; background-image: url(../cd0bb358c45b584743d8ce4991777c42.svg); }
+

test/cases/function-publicpath/index.js

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+import './nested/style.css';

test/cases/function-publicpath/nested/style.css

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+body { background: red; background-image: url(../react.svg); }

test/cases/function-publicpath/react.svg

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+const Self = require('../../../');
+const path = require('path')
+
+module.exports = {
+  entry: './index.js',
+  module: {
+    rules: [
+      {
+        test: /\.css$/,
+        use: [
+          {
+            loader: Self.loader,
+            options: {
+              publicPath: (resourcePath, context) => path.relative(path.dirname(resourcePath), context) + '/',
+            }
+          },
+          'css-loader',
+        ],
+      }, {
+        test: /\.(svg|png)$/,
+        use: [{
+          loader: 'file-loader',
+          options: {
+            filename: '[name].[ext]'
+          }
+        }]
+      }
+    ],
+  },
+  plugins: [
+    new Self({
+      filename: '[name].css',
+    }),
+  ],
+};