When I add the following code to my package.json I get an error saying it is not supported:
"jest": {
"resetMocks": true
},
Thanks in advance!
Solution
Add the following to src/setupTests.js:
beforeEach(() => {
jest.resetAllMocks()
})
Details
The documentation for the resetMocks option states that setting it to true is "Equivalent to calling jest.resetAllMocks() between each test."
Looking at the Jest source shows that the check for config.resetMocks happens within a beforeEach() and if true it calls jest.resetAllMocks().
Apps bootstrapped with create-react-app that are using react-scripts version 0.4.0 or higher will automatically run src/setupTests.js to initialize the test environment before each test runs.
So adding the above code to src/SetupTests.js is equivalent to setting the resetMocks option to true for a non-create-react-app app.