Having trouble resolving all parameters for the Response error in my Jasmine test

Below is a snippet of the code from my test:

import {
  beforeEach, beforeEachProviders,
  describe, xdescribe,
  expect, it, xit,
  async, inject
} from '@angular/core/testing';
import { UserService } from './user.service';
import { Http, ConnectionBackend, Response, Headers, RequestOptions } from '@angular/http';
import { Observable }     from 'rxjs/Observable';
import { LocalStorage, SessionStorage, WEB_STORAGE_PROVIDERS } from 'h5webstorage';

beforeEachProviders(() => [
  UserService, Http, Response, Observable, ConnectionBackend, LocalStorage, Headers, RequestOptions
]);

describe('Service: UserService', () => {

  it('testtest', inject([UserService], (service) => {
    expect('test').toEqual('test');
  }));
});

Upon running this code, an error message appears:

Error: Cannot resolve all parameters for 'Response'(?). Make sure that all the parameters are decorated with Inject or have valid type annotations and that 'Response' is decorated with Injectable.

Could this be due to improper dependency injection in the test? What is the correct way to handle dependency injection in a Jasmine test?

Answer №1

Here is a solution for your issue:

import { provide } from '@angular/core';
import {
    beforeEach, 
    addProviders,
    inject
} from '@angular/core/testing';
import { UserService } from './user.service';

import {BaseRequestOptions, Http, Response, ResponseOptions, RequestMethod} from '@angular/http';

import {MockBackend} from '@angular/http/testing';

describe('Service: UserService', () => {
    beforeEach(() => addProviders([
        UserService,
            BaseRequestOptions,
            MockBackend,
            provide(Http, {
                useFactory: (backend: MockBackend, defaultOptions: BaseRequestOptions) => {
                    return new Http(backend, defaultOptions);
                },
                deps: [MockBackend, BaseRequestOptions]
            })
        ]));

    it('testtest', inject([UserService], (service) => {
        expect('test').toEqual('test');
    }));
});

Make sure to include a factory when providing Http in order to mock responses successfully.

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