expect.anything() error

[rrustia]

In the expect.anything sample code, it's throwing an error in line 3("[1].map(mock)").

// Test code as below:

test('map calls its argument with a non-null argument', () => {
const mock = jest.fn();
[1].map(mock);
expect(mock).toBeCalledWith(expect.anything());
});

// Output from test below:

expect(jest.fn()).toBeCalledWith(expected)

Expected mock function to have been called with:
  [Anything]
But it was called with:
  [1, 0, [1]]

[rogeliog]

Hi, thanks for reporting!

When you call mock(1) it calls the mock function with one arg, which is why this works...

  mock(1)
  expect(mock).toBeCalledWith(expect.anything());

But calling [1].map(mock); fails because map adds two extra parameters to the mock call(index and array).

To make it work you could do one of the following:

1. Add more arguments to toBeCalledWith

[1].map(mock);
expect(mock).toBeCalledWith(expect.anything(), expect.anything(), expect.anything());

2. Call mock from an anonymous function in the map

[1].map(x => mock(x));
expect(mock).toBeCalledWith(expect.anything());

[thymikee]

Thanks @rogeliog <3

[SimenB]

@thymikee @rogeliog the issue is that the the example in the OP is from the docs.

https://github.com/facebook/jest/blob/2ae45c306bf03612061ce2c802857d74cca7d215/docs/ExpectAPI.md#expectanything

@rrustia would you like to send a PR with one of the fixes above?

[alopezsanchez]

Hello! I just did a PR fixing this small issue 😃

[rrustia]

Thanks! -------------------------------------------- On Sun, 12/3/17, Alejandro López <[email protected]> wrote: Subject: Re: [facebook/jest] expect.anything() error (#4916) To: "facebook/jest" <[email protected]> Cc: "Ronel Rustia" <[email protected]>, "Mention" <[email protected]> Date: Sunday, December 3, 2017, 1:25 PM Hello! I just did a PR fixing this small issue 😃 — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub, or mute the thread.

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