I'm writing a little testing tool for Jest (just to learn). It is called assertTruthy(msg, fn, args)
, expects a message, a function and arguments and should pass if the thing that is returned when the function is invoked with the arguments is truthy and fail if its not.
I would like to add it to Jest, so that you could call it without importing it in every environment.
describe('someFn()', () => {
// like 'it', 'describe' and 'expect' it should just be available here
it('is a function', () => {
expect(typeop someFN).toEqual('Function');
});
assertTruthy('it should return true', someFn, 3, 4);
});
I know Jest has setupFiles
and setupFilesAfterEnv
but I can't figure out how to use them to achieve this.
How do you add commands to Jest?
PS: On a single project basis (in CRA) I managed to do this like this:
// in src/setupFiles.js
const assertTruthy = // function definition ...
global.assertTruthy = assertTruthy
from How to add global commands to Jest like describe and it?
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