Add test coverage for new library feature

Author: christophersmith262

lib/DrupalLibraryModule.js

@@ -4,7 +4,7 @@ const Module = require('webpack').Module,
 /**
  * A webpack module representing a Drupal library dependency.
  */
-class DrupalLibraryModule extends Module {
+module.exports = class DrupalLibraryModule extends Module {
 
   constructor(name) {
     super("", null)

test/fixtures/require-drupal.es6.js

@@ -0,0 +1 @@
+require('@drupal(drupal/core)')

test/library-dependency.test.js

@@ -0,0 +1,18 @@
+const path = require('path'),
+  runWebpack = require('./lib/webpack-wrapper')
+
+test('Generates a library entry for @drupal(core/drupal)', async () => {
+  const result = (await runWebpack({
+    entry: {
+      'require-drupal': path.resolve(__dirname, './fixtures/require-drupal.es6.js'),
+    },
+  })).result
+
+  expect(result).toEqual({
+    'require-drupal': {
+      version: '1.x',
+      js: { 'require-drupal.js': {} },
+      dependencies: [ 'drupal/core' ],
+    },
+  })
+})