So, I'm attempting to do something which on the surface should be very simple...
I have some constants defined in: ` //constants.js
module.exports = {
MY_CONSTANT: "TEST"
}
` I have a file which I'm trying to test which has a branching statement like this:
`
//file to test
//...
if(CONSTANTS.MY_CONSTANT === "TEST")
{...}
...
`
And I have a test like this: `
//test
it("Should do something when MY_CONSTANT === "TEST, () => {
//This is fine as it is exported as TEST
})
it("Should do something else when MY_CONSTANT !== "TEST, () => {
//This seems annoyingly difficult to get working...
})
`
I've tried this - With no luck, it doesn't change the actual value
I've tried changing the constant export to export an object instead (that didn't work)
I've tried adding a jest.mock(..) for the constants in my test file and doing an unmock in the tests I don't need them mocked.
I've tried adding a jest.doMock(...) within the test function I need to change the value. (along with jest.resetModules and another require)
I've tried adding a jest.doMock(...) to a tests beforeEach (along with jest.resetModules and another require)
I'm at a loss really...literally all I want to do is change a property value before a test runs 😂
Update So I've done some of the suggestions made:
I now have a mocks folder adjacent to the constant folder It contains a file named the same as the actual constants file and a custom export
I've then added jest.mock("../constants);
inside the test.
I've then also added a const funcImTesting = require("../../file").testFunction
inside the test.
Still the constant remains unchanged and the test fails
To mock for one test only:
jest.mock('./constants.js', () => ({
MY_CONSTANT: 'something fake'
}));
https://jestjs.io/docs/en/manual-mocks
To provide a mock for every test:
__mocks__
directory adiacent to the module you desire to mockjest.mock('./moduleName')
in your test