Meu teste apresenta o seguinte erro: TypeError: relatorioService.buscarRelatorioEnfornamento is not a function

Meu teste apresenta o seguinte erro: TypeError: relatorioService.buscarRelatorioEnfornamento is not a function

import {
    HttpClientTestingModule,
    HttpTestingController,
} from '@angular/common/http/testing';
import { RelatoriosService } from './relatorios.service';
import { TestBed } from '@angular/core/testing';
import { buildRelatorioEnfornamento, buildRelatorioDesenfornamento } from './utils';

const mockDataEnfornamento = {
    api: 'http://localhost:5000/api/cq3/escala/relatorios/enfornamento',
    data: buildRelatorioEnfornamento(),
};

const mockDataDesenfornamento = {
    api: 'http://localhost:5000/api/cq3/escala/relatorios/desenfornamento',
    data: buildRelatorioDesenfornamento(),
};


describe(`${RelatoriosService.name}`, () => {

    let relatorioService: RelatoriosService;
    let httpController: HttpTestingController;

    beforeEach(async () => {

        await TestBed.configureTestingModule({
            imports: [HttpClientTestingModule],
            providers: [
                RelatoriosService,
                // {
                //     provide: PegarCoqueriaURLService,
                //     useValue: {
                //         coqeuria(): string { return 'cq3'; }
                //     },
                // },
                // {
                //     provide: RelatoriosService,
                //     useValue: {
                //         baseUrl: 'http://localhost:5000/api',
                //     },
                // },
                {
                    provide: RelatoriosService,
                    useValue: {
                        url(): string {
                            return 'http://localhost:5000/api/cq3/escala/relatorios';
                        },
                    },
                },
            ],
        }).compileComponents();

        relatorioService = TestBed.inject(RelatoriosService);
        httpController = TestBed.inject(HttpTestingController);

    });

    afterEach(() => {
        httpController.verify();
    });

    it('deve retornar uma lista de enfornamentos', (done) => {

        relatorioService.buscarRelatorioEnfornamento(new Date, new Date).subscribe(response => {
            expect(response[0].idForno).toBe(1);
            done();
        });
        httpController.expectOne(mockDataEnfornamento.api).flush(mockDataEnfornamento.data);

    });

    // it('deve retornar uma lista de desenfornamentos', (done) => {

    //     relatorioService.buscarRelatorioEnfornamento(new Date, new Date).subscribe(console.log);

    //     httpController.expectOne(mockDataDesenfornamento.api).flush(mockDataDesenfornamento.data);
    // });
});

o serviço que estou tentando testar é:

import { Injectable } from '@angular/core';
import { HttpClient } from '@angular/common/http';
import { SettingEnvironmentService } from 'src/app/common/service/setting-environment.service';
import { RelatorioEnfornamento } from './../models/relatorio-enfornamento.model';
import { RelatorioDesenfornamento } from '../models/relatorio-desenfornamento.model';
import { PegarCoqueriaURLService } from 'src/app/common/service/pegar-coqueria-url.service';

@Injectable({
    providedIn: 'root',
})
export class RelatoriosService {
    private baseUrl: string;

    constructor(
        private http: HttpClient,
        private pegarCoqueriaUrl: PegarCoqueriaURLService,
        private environmentService: SettingEnvironmentService
    ) {
        this.baseUrl = this.environmentService.baseUrl;
    }

    private get url() {
        return `${this.baseUrl}/${this.pegarCoqueriaUrl.coqueria}/escala/relatorios`;
    }

    buscarRelatorioEnfornamento(dataInicio: Date, dataFinal: Date) {
        return this.http
            .get<RelatorioEnfornamento[]>(
                `${this.url}/enfornamento?dataInicial=${dataInicio.toISOString()}&dataFinal=${dataFinal.toISOString()}`
            );
    }

    buscarRelatorioDesenfornamento(dataInicio: Date, dataFinal: Date) {
        return this.http
            .get<RelatorioDesenfornamento[]>(
                `${this.url}/desenfornamento?dataInicial=${dataInicio.toISOString()}&dataFinal=${dataFinal.toISOString()}`
            );
    }
}