I'm trying to write a simple test for a simple React component, and I want to use Jest to confirm that a function has been called when I simulate a click with enzyme. According to the Jest docs, I should be able to use spyOn to do this: spyOn.  H...
I recently wanted to test that some custom method gets conditionally called in the componentDidMount method of a React component.  componentDidMount() {   if (this.props.initOpen) {     this.methodName();   } }   I'm using Jest as my testing fram...
Simulating a button click seems like a very easy/standard operation. Yet, I can't get it to work in Jest.js tests.   This is what I tried (and also doing it using jquery), but it didn't seem to trigger anything:  import { mount } from 'en...
In my code, I trigger a callback upon "OK" click of a window.confirm prompt, and I want to test that the callback is triggered.  In sinon, I can stub the window.confirm function via:  const confirmStub = sinon.stub(window, 'confirm');...
I am creating a JS test on my react-native project. I'm specifically using firebase for react native, in which I would like to replace firebase instance with a mockfirebase instance if JS is running the code of my class.  For example I have class...
Jest runs your test suite in parallel by default, but there is a flag (--runInBand) that allows you to run the whole suite sequentially (as pointed out here)  I have some tests that cannot run in parallel, but running the whole suite sequentially tak...
I'm trying to mock an async function that is exported as a default export but all I get is TypeError: Cannot read property 'then' of undefined  What I'm trying to mock is config.js:  const configureEnvironment = async (nativeConfig) =...
This question pertains to testing javascript and mocking functions.   Say I have a module that looks like this:   export function alpha(n) {     return `${n}${beta(n)}${n}`; }  export function beta(n) {     return new Array(n).fill(0).map(() => &#...
I am struggling to jest mock the below method. Not able to mock. Please see my test case below it. Test case fails with error      TypeError: XXXXXXX is not a function.     When I run coverage report, it says all lines are covered. What is that I am...
I have seen this question which expects a Promise to work. In my case the Error is thrown before and outside a Promise.  How can I assert the error in this case? I have tried the options below.  test('Method should throw Error', async () =>...

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