jslib/spec/common/services/consoleLog.service.spec.ts

import { ConsoleLogService } from '../../../src/services/consoleLog.service';

const originalConsole = console;
let caughtMessage: any;

declare var console: any;

export function interceptConsole(interceptions: any): object {
    console = {
        // tslint:disable-next-line
        log: function () {
            interceptions.log = arguments;
        },
        // tslint:disable-next-line
        warn: function () {
            interceptions.warn = arguments;
        },
        // tslint:disable-next-line
        error: function () {
            interceptions.error = arguments;
        },
    };
    return interceptions;
}

export function restoreConsole() {
    console = originalConsole;
}

describe('ConsoleLogService', () => {
    let logService: ConsoleLogService;
    beforeEach(() => {
        caughtMessage = {};
        interceptConsole(caughtMessage);
        logService = new ConsoleLogService(true);
    });

    afterAll(() => {
        restoreConsole();
    });

    it('filters messages below the set threshold', () => {
        logService = new ConsoleLogService(true, level => true);
        logService.debug('debug');
        logService.info('info');
        logService.warning('warning');
        logService.error('error');

        expect(caughtMessage).toEqual({});
    });
    it('only writes debug messages in dev mode', () => {
        logService = new ConsoleLogService(false);

        logService.debug('debug message');
        expect(caughtMessage.log).toBeUndefined();
    });


    it('writes debug/info messages to console.log', () => {
        logService.debug('this is a debug message');
        expect(caughtMessage).toEqual({ log: jasmine.arrayWithExactContents(['this is a debug message']) });

        logService.info('this is an info message');
        expect(caughtMessage).toEqual({ log: jasmine.arrayWithExactContents(['this is an info message']) });
    });
    it('writes warning messages to console.warn', () => {
        logService.warning('this is a warning message');
        expect(caughtMessage).toEqual({ warn: jasmine.arrayWithExactContents(['this is a warning message']) });
    });
    it('writes error messages to console.error', () => {
        logService.error('this is an error message');
        expect(caughtMessage).toEqual({ error: jasmine.arrayWithExactContents(['this is an error message']) });
    });

    it('times with output to info', async () => {
        logService.time();
        await new Promise(r => setTimeout(r, 250));
        const duration = logService.timeEnd();
        expect(duration[0]).toBe(0);
        expect(duration[1]).toBeGreaterThan(0);
        expect(duration[1]).toBeLessThan(500 * 10e6);

        expect(caughtMessage).toEqual(jasmine.arrayContaining([]));
        expect(caughtMessage.log.length).toBe(1);
        expect(caughtMessage.log[0]).toEqual(jasmine.stringMatching(/^default: \d+\.?\d*ms$/));
    });

    it('filters time output', async () => {
        logService = new ConsoleLogService(true, level => true);
        logService.time();
        logService.timeEnd();

        expect(caughtMessage).toEqual({});
    });
});