describe('CatService', () => {
  let classUnderTest: CatService;
  
  beforeAll(() => {
    classUnderTest = new CatService();
  });

  it('returns undefined for an unknown cat breed', () => {
    const result = classUnderTest.getBreed('Maine Coon');
    
    expect(result).toBeUndefined();
  });
  
  it('suceeds to provide a known cat breed', () => {
    classUnderTest.addKnownBreed('Maine Coon');
    const result = classUnderTest.getBreed('Maine Coon');
    
    expect(result).toBeDefined();
  });
})