JS-Testing: Assertion Examples

assertions.spec.js

describe('greater than in obj', () => {
  // is the second value of the obj greater than 5?
  const obj = {value: [5, 4]};

  // different Assertions/Expectations/Matcher Variants
  it('jest equal', () => expect(obj.value[1] > 5).toBeTruthy());
  it('jest greater', () => expect(obj.value[1]).toBeGreaterThan(5));
  it('jest matchObject', () => expect(obj).toMatchObject({value: [5, 5]}));
  it('unexpected satisfy', () =>
    unexpect(obj, 'to satisfy', {value: [5, unexpect.it('to be greater than', 4)]})
   );
  it('power assert', () => assert(obj.value[1] > 5));
});