graphql / Apollo test case fails Error: Expected one matching operation for criteria "Match DocumentNode", found none - jasmine

Question

I am trying to write a test for an angular service which I am using with graphql & Apollo.
I'm receiving these errors: Error: Expected one matching operation for criteria "Match DocumentNode", found none.
and
Error: Expected no open operations, found 1:
foo.spec.ts
import { TestBed } from '#angular/core/testing';
import {
....
const fragment: DocumentNode = gql`
fragment SummaryDetails on SummaryDetails {
foo
...
}
`;
const summaryQuery: DocumentNode = gql`
query Summary(
) {
Summary(
) {
...SummaryDetails
}
}
${fragment}
`;
const fundDataServiceParams: FundDataServiceParams = {
foo ...
};
const expectedRawSummaryDetails: any = {
Summary: [
{
foo ...
},
],
};
const expectedSummaryDetails: SummaryDetail[] = [
{
foo ...
},
];
describe('FundSummaryServiceRegisterMethod', () => {
let controller: ApolloTestingController;
let fundSummaryService: FundSummaryService;
beforeEach(() => {
TestBed.configureTestingModule({
imports: [ApolloTestingModule, HttpClientTestingModule],
});
controller = TestBed.inject(ApolloTestingController);
foo = TestBed.inject(foo);
});
afterEach(() => {
controller.verify();
});
fit('should return foodetails', (done: DoneFn) => {
fundSummaryService
.register(fragment, fundDataServiceParams)
.subscribe((foo) => {
expect(foo).toEqual(foo);
done();
});
const op = controller.expectOne(fooQuery);
expect(op.operation.variables.foo).toEqual(foo.foo);
op.flushData(expectedfoo);
});
});
Note: I tried this old post's suggestion, didn't work.

Answer 1

The good news for you is that in the afterEach, controller.verify() is failing meaning there is a query in queue and not all of them have been dealt with. I am thinking that your summaryQuery is slightly off where it is not matching exactly the query where the afterEach is saying is still in queue and has not been flushed.
I think you can use a different definition of expectOne from the documentation to match the query in queue. I don't have much experience with Apollo or GraphQL but try something like this for the expectOne:
const op = controller.expectOne(operation => {
// can assert some stuff on the operation like the documentation shows
return true;
});
If the above works, it most likely means that summaryQuery does not match the query that ApolloTestingController sees.