Mocked service throws NG0201: No provider found for `_HttpClient` error

I'm writing unit tests for NX libraries and one service is driving me crazy. It injects generated services and calls their exposed methods.

I'm using Jest + Spectator combination and I'm getting this error:

ɵNotFound: NG0201: No provider found for _HttpClient. Source: Standalone[AppSearch]. Path: SearchService -> StructuredSearchService -> _HttpClient. Find more at https://angular.dev/errors/NG0201
​

My Unit test:

import { createServiceFactory, mockProvider, SpectatorService } from '@ngneat/spectator/jest';

describe('SearchSearch', () => {
let spectator: SpectatorService<SearchService>;
const createService = createServiceFactory({
service: SearchService,
providers: [
provideHttpClient(), // I believe those providers are in fact unnecessary
provideHttpClientTesting(), // The service does not use Http directly
mockProvider(SimpleSearchService, {
simpleSearch: () => of({ items: [] }),
}),
mockProvider(StructuredSearchService, {
structuredSearch: () => of({ items: [] }),
}),
// Ver. 2 - I tried this approach too
// {
// provide: SimpleSearchService,
// useValue: {
// simpleSearch: jest.fn().mockReturnValue(of({ items: [] })),
// },
// },
// {
// provide: StructuredSearchService,
// useValue: {
// structuredSearch: jest.fn().mockReturnValue(of({ items: [] })),
// },
// },
// Ver. 3 - Spectator's Mocks array does not help either
// mocks: [SimpleSearchService, StructuredSearchService],
],
});


It looks like Jest is ignoring my attempts at mocking OpenAPI generated services and fails on Http, which I don't really need. What did I forget of overlook? Versions:

"@ngneat/spectator": "^21.0.0",
"jest": "^29.0.0",
"@angular/*": "^20.1.6",

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