otiai10/jestil

# jestil

jest test utils, mocking global `Date`, and other stuff.


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# Example

## Clock.freeze & release

```typescript
import {Clock} from "jestil";

describe("Back to the Future", () => {
  describe("DeLorean", () => {
    it("can go back to the future", () => {

      // Freeze the clock
      const clock = Clock.freeze("1955-11-12 22:04:00");

      // new Date().getFullYear() == 1955
      expect(delorean.jump()).toBe(true);

      // Release the clock
      clock.release();

      // new Date().getFullYear() == 2021 (maybe)
      expect(delorean.jump()).toBe(false);

    });
  });
});
```

## Fetch.replies

```typescript
import {Fetch} from "jestil";

describe('SchrodingerCat', () => {
  describe('exists', () => {
    it('should return its existence', async () => {

      // Define the response you want for any "fetch" call.
      Fetch.replies({message: 'Hey, I must exist!', status: 200});

      // Even it'll be called inside your method.
      const response = await SchrodingerCat.askInsideBox();

      // The response will be what you specified.
      expect(response.message).toBe('Hey, I must exist!');
      expect(response.status).toBe(200);

    });
  });
});
```

# Issues

- https://github.com/otiai10/jestil/issues