Merge pull request #726 from ckeditor/ci/741

Other (tests): Added in the Karma configuration a list of available plugins to avoid an error related to loading a non-registered plugin.

packages/ckeditor5-dev-tests/lib/utils/automated-tests/getkarmaconfig.js

@@ -41,6 +41,20 @@ module.exports = function getKarmaConfig( options ) {
 		// Frameworks to use. Available frameworks: https://npmjs.org/browse/keyword/karma-adapter
 		frameworks: [ 'mocha', 'sinon-chai' ],
 
+		// For unknown reasons, sometimes Karma does not fill the list automatically. So, all available plugins must be specified manually.
+		plugins: [
+			require.resolve( 'karma-chai' ),
+			require.resolve( 'karma-chrome-launcher' ),
+			require.resolve( 'karma-coverage' ),
+			require.resolve( 'karma-firefox-launcher' ),
+			require.resolve( 'karma-mocha' ),
+			require.resolve( 'karma-mocha-reporter' ),
+			require.resolve( 'karma-sinon' ),
+			require.resolve( 'karma-sinon-chai' ),
+			require.resolve( 'karma-sourcemap-loader' ),
+			require.resolve( 'karma-webpack' )
+		],
+
 		// Files saved in directory `ckeditor5/packages/ckeditor5-utils/tests/_assets/` are available under: http://0.0.0.0:{port}/assets/
 		proxies: {
 			'/assets/': '/base/packages/ckeditor5-utils/tests/_assets/',

packages/ckeditor5-dev-tests/tests/utils/automated-tests/getkarmaconfig.js

@@ -118,4 +118,24 @@ describe( 'getKarmaConfig()', () => {
 		expect( karmaConfig.proxies ).to.have.own.property( '/example.com/image.png' );
 		expect( karmaConfig.proxies ).to.have.own.property( '/www.example.com/image.png' );
 	} );
+
+	it( 'should contain a list of available plugins', () => {
+		const karmaConfig = getKarmaConfig( {
+			files: [ '*' ],
+			reporter: 'mocha',
+			sourceMap: false,
+			coverage: false,
+			browsers: [ 'Chrome' ],
+			watch: false,
+			verbose: false,
+			themePath: 'workspace/path/to/theme.css',
+			entryFile: 'workspace/entry-file.js',
+			globPatterns: {
+				'*': 'workspace/packages/ckeditor5-*/tests/**/*.js'
+			}
+		} );
+
+		expect( karmaConfig.plugins ).to.be.an( 'array' );
+		expect( karmaConfig.plugins ).to.have.lengthOf.above( 0 );
+	} );
 } );