nextTick.spec.ts

import {nextTick} from "../src/ts-mockito";

describe("nextTick", () => {
    it('should execute after setImmediate()', async () => {
        let done = false;

        setImmediate(() => done = true);

        await nextTick();
        expect(done).toBe(true);
    });

    it('should execute after setTimeout(0)', async () => {
        let done = false;

        setTimeout(() => done = true, 0);

        await nextTick();
        expect(done).toBe(true);
    });

    it('should execute after promise', async () => {
        let done = false;

        Promise.resolve().then(() => done = true);

        await nextTick();
        expect(done).toBe(true);
    });

    if (typeof jest !== "undefined") {
        describe('with fake timers', () => {
            beforeEach(() => {
                jest.useFakeTimers();
            });

            afterEach(() => {
                jest.useRealTimers();
            });
            
            it('should execute after setImmediate()', async () => {
                let done = false;
        
                setImmediate(() => done = true);
        
                await nextTick();
                expect(done).toBe(true);
            });    
        });
    }
});