Testing Service Angular

I am facing a problem with I have no clue how to solve it beacause I am so noobie with testing in front.

Right now I am testing a service that have this code:

import { Injectable } from '@angular/core';
import { EndpointLocatorService } from './endpointLocator.service';
import { Http, Headers } from '@angular/http';
import { Observable } from 'rxjs/Observable';
import 'rxjs/add/operator/map';
import 'rxjs/add/operator/catch';

@Injectable()
export class CancelAppService {

    constructor(private readonly http: Http,
        private readonly _endPointLocator: EndpointLocatorService) { }

    getScopeSignature(signatureToken: string) {
        const url = this._endPointLocator.locate('cancelApp');
        const language = sessionStorage.getItem('languageSession');
        const headers = new Headers({
            'Content-Type': 'application/json',
            'Accept-Language': language,
            'X-B3-TraceId': sessionStorage.getItem('requestID')
        });
        const body = JSON.stringify({ 'signatureToken': signatureToken });
        return this.http.post(url, body, { headers }).map(data => {
            return data.json();
        }).catch((error: any) => {
            return Observable.throw(new Error(error.status));
        });
    }
}

The testing file contains this:

import { TestBed } from '@angular/core/testing';
import { CancelAppService } from './cancelApp.service';
import { HttpModule } from '@angular/http';
import { EndpointLocatorService } from './endpointLocator.service';
import { AppConfig } from '../app.config';
import 'jasmine';

fdescribe('CancelAppService', () => {
    let cancelService: CancelAppService; // Add this
    let endLocator: EndpointLocatorService;
    const mockData = {
        "signature_token": "returnedToken"
    };
    const body = JSON.stringify({ 'signatureToken': 'givenToken' });
    beforeEach(() => {
        TestBed.configureTestingModule({
            imports: [
                HttpModule
            ],
            providers: [
                CancelAppService,
                AppConfig,
                EndpointLocatorService
            ]
        });
        cancelService = TestBed.get(CancelAppService); // Add this
        endLocator = TestBed.get(EndpointLocatorService);
    });

    it('should be created', () => { // Remove inject()
        expect(cancelService).toBeDefined();
    });

    it('should call the service', () => {
        spyOn(endLocator, 'locate').and.returnValue('someUrl');
        spyOn(cancelService, 'getScopeSignature').and.callThrough();
        cancelService.getScopeSignature(body);
        expect(cancelService.getScopeSignature).toHaveBeenCalled();
    });

    it('should return a object', () => {
        (done: DoneFn) => {
            spyOn(endLocator, 'locate').and.returnValue('someUrl');
            spyOn(cancelService, 'getScopeSignature').and.returnValue(mockData);
            cancelService.getScopeSignature(body).subscribe(data => {
                expect(data).toEqual(mockData);
                done();
            });
        }
    });
});

The problem is that, when I try to test the returned data map, appears me like a success test, but the coverage says that I have no coveraged the lines of map, and catch.

Any idea what am I doing wrong? and how to solve it?

Thank you so much!!