Fixes #212: Add tests

src/loader/__tests__/logger.js

@@ -0,0 +1,143 @@
+/**
+ * © 2014 Liferay, Inc. <https://liferay.com>
+ *
+ * SPDX-License-Identifier: LGPL-3.0-or-later
+ */
+
+import Logger from '../logger';
+
+/* eslint-disable no-console */
+
+const savedError = console.error;
+const savedWarn = console.warn;
+const savedInfo = console.info;
+const savedDebug = console.debug;
+const savedLog = console.log;
+
+describe('Logger', function() {
+	beforeEach(() => {
+		console.error = jest.fn();
+		console.warn = jest.fn();
+		console.info = jest.fn();
+		console.debug = jest.fn();
+		console.log = jest.fn();
+	});
+
+	afterEach(() => {
+		console.error = savedError;
+		console.warn = savedWarn;
+		console.info = savedInfo;
+		console.debug = savedDebug;
+		console.log = savedLog;
+	});
+
+	it('off does not write any message', () => {
+		const log = new Logger({logLevel: 'off'});
+
+		log.error('an error');
+		log.warn('a warn');
+		log.info('an info');
+		log.debug('a debug');
+
+		expect(console.error.mock.calls).toHaveLength(0);
+		expect(console.warn.mock.calls).toHaveLength(0);
+		expect(console.info.mock.calls).toHaveLength(0);
+		expect(console.debug.mock.calls).toHaveLength(0);
+	});
+
+	it('error writes error messages only', () => {
+		const log = new Logger({logLevel: 'error'});
+
+		log.error('an error');
+		log.warn('a warn');
+		log.info('an info');
+		log.debug('a debug');
+
+		expect(console.error.mock.calls).toHaveLength(1);
+		expect(console.error.mock.calls[0]).toEqual([
+			'liferay-amd-loader |',
+			'an error',
+		]);
+		expect(console.warn.mock.calls).toHaveLength(0);
+		expect(console.info.mock.calls).toHaveLength(0);
+		expect(console.debug.mock.calls).toHaveLength(0);
+	});
+
+	it('warn writes error and warn messages only', () => {
+		const log = new Logger({logLevel: 'warn'});
+
+		log.error('an error');
+		log.warn('a warn');
+		log.info('an info');
+		log.debug('a debug');
+
+		expect(console.error.mock.calls).toHaveLength(1);
+		expect(console.error.mock.calls[0]).toEqual([
+			'liferay-amd-loader |',
+			'an error',
+		]);
+		expect(console.warn.mock.calls).toHaveLength(1);
+		expect(console.warn.mock.calls[0]).toEqual([
+			'liferay-amd-loader |',
+			'a warn',
+		]);
+		expect(console.info.mock.calls).toHaveLength(0);
+		expect(console.debug.mock.calls).toHaveLength(0);
+	});
+
+	it('info writes error, warn and info messages only', () => {
+		const log = new Logger({logLevel: 'info'});
+
+		log.error('an error');
+		log.warn('a warn');
+		log.info('an info');
+		log.debug('a debug');
+
+		expect(console.error.mock.calls).toHaveLength(1);
+		expect(console.error.mock.calls[0]).toEqual([
+			'liferay-amd-loader |',
+			'an error',
+		]);
+		expect(console.warn.mock.calls).toHaveLength(1);
+		expect(console.warn.mock.calls[0]).toEqual([
+			'liferay-amd-loader |',
+			'a warn',
+		]);
+		expect(console.info.mock.calls).toHaveLength(1);
+		expect(console.info.mock.calls[0]).toEqual([
+			'liferay-amd-loader |',
+			'an info',
+		]);
+		expect(console.debug.mock.calls).toHaveLength(0);
+	});
+
+	it('debug writes all messages', () => {
+		const log = new Logger({logLevel: 'debug'});
+
+		log.error('an error');
+		log.warn('a warn');
+		log.info('an info');
+		log.debug('a debug');
+
+		expect(console.error.mock.calls).toHaveLength(1);
+		expect(console.error.mock.calls[0]).toEqual([
+			'liferay-amd-loader |',
+			'an error',
+		]);
+		expect(console.warn.mock.calls).toHaveLength(1);
+		expect(console.warn.mock.calls[0]).toEqual([
+			'liferay-amd-loader |',
+			'a warn',
+		]);
+		expect(console.info.mock.calls).toHaveLength(1);
+		expect(console.info.mock.calls[0]).toEqual([
+			'liferay-amd-loader |',
+			'an info',
+		]);
+		expect(console.debug.mock.calls).toHaveLength(1);
+		expect(console.debug.mock.calls[0]).toEqual([
+			'liferay-amd-loader |',
+			'a debug',
+		]);
+	});
+});