How can I get the arguments called in jest mock function?

JavascriptJestjs

Javascript Problem Overview

How can I get the arguments called in jest mock function?

I want to inspect the object that is passed as argument.

Javascript Solutions

Solution 1 - Javascript

Just use mockObject.calls. In my case I used:

const call = mockUpload.mock.calls[0][0]

Here's the documentation about the mock property

Solution 2 - Javascript

Here is a simple way to assert the parameter passed.

expect(mockedFunction).toHaveBeenCalledWith("param1","param2");

Solution 3 - Javascript

You can use toHaveBeenCalledWith() together with expect.stringContaining or expect.arrayContaining() or expect.objectContaining()

...
const { host } = new URL(url);
expect(mockedFunction).toHaveBeenCalledWith("param1", expect.stringContaining(`http://${host}...`);

Solution 4 - Javascript

I prefer lastCalledWith() over toHaveBeenCalledWith(). They are both the same but the former is shorter and help me reduce the cognitive load when reading code.

expect(mockedFn).lastCalledWith('arg1', 'arg2')
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Content TypeOriginal AuthorOriginal Content on Stackoverflow
QuestionBruno QuaresmaView Question on Stackoverflow
Solution 1 - JavascriptBruno QuaresmaView Answer on Stackoverflow
Solution 2 - JavascriptSenthil Arumugam SPView Answer on Stackoverflow
Solution 3 - JavascriptJeremiah FlagaView Answer on Stackoverflow
Solution 4 - JavascriptNearHuscarlView Answer on Stackoverflow