Include a regex in the tests of addExternals.

Author: David Ellingsworth

test/WebpackConfig.js

@@ -944,10 +944,12 @@ describe('WebpackConfig object', () => {
 
             config.addExternals({ 'jquery': 'jQuery', 'react': 'react' });
             config.addExternals({ 'lodash': 'lodash' });
+			config.addExternals(/^(jquery|\$)$/i);
 
             expect(config.externals).to.deep.equals([
                 { 'jquery': 'jQuery', 'react': 'react'},
-                { 'lodash': 'lodash' }
+                { 'lodash': 'lodash' },
+				/^(jquery|\$)$/i
             ]);
         });
     });