describe('Test warning', () => { let spy: jest.SpyInstance; beforeAll(() => { spy = jest.spyOn(console, 'error').mockImplementation(() => {}); }); afterAll(() => { spy.mockRestore(); }); beforeEach(() => { jest.resetModules(); }); afterEach(() => { spy.mockReset(); }); it('Test noop', async () => { const { noop } = await import('../warning'); const value = noop(); expect(value).toBe(undefined); expect(spy).not.toHaveBeenCalled(); expect(noop).not.toThrow(); }); describe('process.env.NODE_ENV !== "production"', () => { it('If `false`, exec `console.error`', async () => { const warning = (await import('../warning')).default; warning(false, 'error'); expect(spy).toHaveBeenCalled(); }); it('If `true`, do not exec `console.error`', async () => { const warning = (await import('../warning')).default; warning(true, 'error message'); expect(spy).not.toHaveBeenCalled(); }); }); describe('process.env.NODE_ENV === "production"', () => { it('Whether `true` or `false`, do not exec `console.error`', async () => { const prevEnv = process.env.NODE_ENV; process.env.NODE_ENV = 'production'; const { default: warning, noop } = await import('../warning'); expect(warning).toEqual(noop); warning(false, 'error message'); expect(spy).not.toHaveBeenCalled(); warning(true, 'error message'); expect(spy).not.toHaveBeenCalled(); process.env.NODE_ENV = prevEnv; }); }); });