I'm testing my GraphQL api using Jest.
I'm using a separate test suit for each query/mutation
I have 2 tests (each one in a separate test suit) where I mock one function (namely, Meteor's callMethod
) that is used in mutations.
it('should throw error if email not found', async () => {
callMethod
.mockReturnValue(new Error('User not found [403]'))
.mockName('callMethod');
const query = FORGOT_PASSWORD_MUTATION;
const params = { email: '[email protected]' };
const result = await simulateQuery({ query, params });
console.log(result);
// test logic
expect(callMethod).toBeCalledWith({}, 'forgotPassword', {
email: '[email protected]',
});
// test resolvers
});
When I console.log(result)
I get
{ data: { forgotPassword: true } }
This behaviour is not what I want because in .mockReturnValue
I throw an Error and therefore expect result
to have an error object
Before this test, however, another is ran
it('should throw an error if wrong credentials were provided', async () => {
callMethod
.mockReturnValue(new Error('cannot login'))
.mockName('callMethod');
And it works fine, the error is thrown
I guess the problem is that mock doesn't get reset after the test finishes.
In my jest.conf.js
I have clearMocks: true
Each test suit is in a separate file, and I mock functions before tests like this:
import simulateQuery from '../../../helpers/simulate-query';
import callMethod from '../../../../imports/api/users/functions/auth/helpers/call-accounts-method';
import LOGIN_WITH_PASSWORD_MUTATION from './mutations/login-with-password';
jest.mock(
'../../../../imports/api/users/functions/auth/helpers/call-accounts-method'
);
describe('loginWithPassword mutation', function() {
...
UPDATE
When I substituted .mockReturnValue
with .mockImplementation
everything worked out as expected:
callMethod.mockImplementation(() => {
throw new Error('User not found');
});
But that doesn't explain why in another test .mockReturnValue
works fine...
Change .mockReturnValue
with .mockImplementation
:
yourMockInstance.mockImplementation(() => {
throw new Error();
});