created
const someMockFunction = jest.fn();
.mock property
执行次数
someMockFunction.mock.calls.length
参数
第一次执行的第一个参数someMockFunction.mock.calls[0][0]
instances
someMockFunction.mock.instances.length
someMockFunction.mock.instances[0].name
Custom Matchers
toBeCalled()
toBeCalledWith(arg1, arg2)
lastCalledWith(arg1, arg2)
toMatchSnapshot()
