一、語法

expect(實(shí)際變量).toBe(期望值);
普通匹配器
expect({a:1}).toBe({a:1})//判斷兩個(gè)對(duì)象是否相等
expect(1).not.toBe(2)//判斷不等
expect(n).toBeNull(); //判斷是否為null
expect(n).toBeUndefined(); //判斷是否為undefined
expect(n).toBeDefined(); //判斷結(jié)果與toBeUndefined相反
expect(n).toBeTruthy(); //判斷結(jié)果為true
expect(n).toBeFalsy(); //判斷結(jié)果為false
expect(value).toBeGreaterThan(3); //大于3
expect(value).toBeGreaterThanOrEqual(3.5); //大于等于3.5
expect(value).toBeLessThan(5); //小于5
expect(value).toBeLessThanOrEqual(4.5); //小于等于4.5
expect(value).toBeCloseTo(0.3); // 浮點(diǎn)數(shù)判斷相等
expect('Christoph').toMatch(/stop/); //正則表達(dá)式判斷
expect(['one','two']).toContain('one'); //不解釋
測(cè)試函數(shù)的匹配器
toBeCalled()//驗(yàn)證函數(shù)是否被調(diào)用
toBeCalledTimes(number)//驗(yàn)證被調(diào)用函數(shù)的被調(diào)用次數(shù)