test(webpack): add tests

test/fixtures/webpack/webpack.config.js

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+import path from 'path'
+import webpack from 'webpack'
+
+export default {
+  entry: path.resolve(__dirname, './src/assets/js/index.js'),
+  output: {
+    path: path.resolve(__dirname, './dist/assets/js'),
+    filename: 'bundle.js'
+  },
+  module: {
+    loaders: []
+  }
+};

test/webpack.js

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+import path from 'path';
+import configureWebpack from '../src/config/configure-webpack';
+import createDefaults from '../src/config/defaults';
+import {
+  expect
+} from 'chai';
+
+describe('webpack config', () => {
+
+  it('should override module.loaders completely', function(done) {
+    var config = configureWebpack({
+      basePath: path.resolve(__dirname, './fixtures/webpack'),
+      webpack: {
+        dev: './webpack.config.js',
+        prod: './webpack.config.js'
+      }
+    })
+    expect(config.dev.module.loaders).to.have.lengthOf(0)
+    done();
+  });
+
+  it('should keep original module.loaders in tact', function(done) {
+    var config = configureWebpack({
+      basePath: path.resolve(__dirname, './fixtures/webpack'),
+      bower: true,
+      jquery: true
+    })
+    expect(config.dev.module.loaders).to.have.lengthOf(4)
+    done();
+  });
+
+  it('should create correct defaults without loaders', function(done) {
+    var defaults = createDefaults({
+      basePath: path.resolve(__dirname, './fixtures/webpack'),
+      bower: true,
+      jquery: true,
+      webpack: {
+        dev: './webpack.config.js',
+        prod: './webpack.config.js'
+      }
+    })
+    expect(defaults.webpack.dev.module.loaders).to.have.lengthOf(0)
+    done();
+  });
+
+  it('should create correct defaults with default loaders', function(done) {
+    var defaults = createDefaults({
+      basePath: path.resolve(__dirname, './fixtures/webpack'),
+      bower: true,
+      jquery: true
+    })
+    expect(defaults.webpack.dev.module.loaders).to.have.lengthOf(4);
+    done();
+  });
+
+})