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import { ApolloLink, Observable } from 'apollo-link';
import waitForPromises from 'helpers/wait_for_promises';
import { getSuppressNetworkErrorsDuringNavigationLink } from '~/lib/apollo/suppress_network_errors_during_navigation_link';
import { isNavigatingAway } from '~/lib/utils/is_navigating_away';
jest.mock('~/lib/utils/is_navigating_away');
describe('getSuppressNetworkErrorsDuringNavigationLink', () => {
const originalGon = window.gon;
let subscription;
beforeEach(() => {
window.gon = originalGon;
});
afterEach(() => {
if (subscription) {
subscription.unsubscribe();
}
});
const makeMockGraphQLErrorLink = () =>
new ApolloLink(() =>
Observable.of({
errors: [
{
message: 'foo',
},
],
}),
);
const makeMockNetworkErrorLink = () =>
new ApolloLink(
() =>
new Observable(() => {
throw new Error('NetworkError');
}),
);
const makeMockSuccessLink = () =>
new ApolloLink(() => Observable.of({ data: { foo: { id: 1 } } }));
const createSubscription = (otherLink, observer) => {
const mockOperation = { operationName: 'foo' };
const link = getSuppressNetworkErrorsDuringNavigationLink().concat(otherLink);
subscription = link.request(mockOperation).subscribe(observer);
};
describe('when disabled', () => {
it('returns null', () => {
expect(getSuppressNetworkErrorsDuringNavigationLink()).toBe(null);
});
});
describe('when enabled', () => {
beforeEach(() => {
window.gon = { features: { suppressApolloErrorsDuringNavigation: true } };
});
it('returns an ApolloLink', () => {
expect(getSuppressNetworkErrorsDuringNavigationLink()).toEqual(expect.any(ApolloLink));
});
describe('suppression case', () => {
describe('when navigating away', () => {
beforeEach(() => {
isNavigatingAway.mockReturnValue(true);
});
describe('given a network error', () => {
it('does not forward the error', async () => {
const spy = jest.fn();
createSubscription(makeMockNetworkErrorLink(), {
next: spy,
error: spy,
complete: spy,
});
// It's hard to test for something _not_ happening. The best we can
// do is wait a bit to make sure nothing happens.
await waitForPromises();
expect(spy).not.toHaveBeenCalled();
});
});
});
});
describe('non-suppression cases', () => {
describe('when not navigating away', () => {
beforeEach(() => {
isNavigatingAway.mockReturnValue(false);
});
it('forwards successful requests', (done) => {
createSubscription(makeMockSuccessLink(), {
next({ data }) {
expect(data).toEqual({ foo: { id: 1 } });
},
error: () => done.fail('Should not happen'),
complete: () => done(),
});
});
it('forwards GraphQL errors', (done) => {
createSubscription(makeMockGraphQLErrorLink(), {
next({ errors }) {
expect(errors).toEqual([{ message: 'foo' }]);
},
error: () => done.fail('Should not happen'),
complete: () => done(),
});
});
it('forwards network errors', (done) => {
createSubscription(makeMockNetworkErrorLink(), {
next: () => done.fail('Should not happen'),
error: (error) => {
expect(error.message).toBe('NetworkError');
done();
},
complete: () => done.fail('Should not happen'),
});
});
});
describe('when navigating away', () => {
beforeEach(() => {
isNavigatingAway.mockReturnValue(true);
});
it('forwards successful requests', (done) => {
createSubscription(makeMockSuccessLink(), {
next({ data }) {
expect(data).toEqual({ foo: { id: 1 } });
},
error: () => done.fail('Should not happen'),
complete: () => done(),
});
});
it('forwards GraphQL errors', (done) => {
createSubscription(makeMockGraphQLErrorLink(), {
next({ errors }) {
expect(errors).toEqual([{ message: 'foo' }]);
},
error: () => done.fail('Should not happen'),
complete: () => done(),
});
});
});
});
});
});
|
