monkey-test.spec.ts

  describe('monkey test', () => {

    let userInputs: any[] = [
      {budget: 70, apple: 1, pear: 2, orange: 3},
      {apple: 3, orange: 1},
      {budget: 0},   // <<-- causes change detection exception
      {pear: 10}
    ];

    beforeEach(() => {
      fixture.autoDetectChanges(true);
    });

    it('survives the monkey test', () => {
      userInputs.forEach((userInput) => {
        fillValueAndLeave('#budget', userInput.budget);
        fillValueAndLeave('#fruit0', userInput.apple);
        fillValueAndLeave('#fruit1', userInput.pear);
        fillValueAndLeave('#fruit2', userInput.orange);
      });
    });
  });