public async Task GetClientsTest() { var partners = new List <Partners> { new Partners() { PartnerID = 1 }, new Partners() { CompanyName = "JJJ" }, }; var fakeRepositoryMock = new Mock <IPartnersRepository>(); fakeRepositoryMock.Setup(x => x.GetAll()).ReturnsAsync(partners); var partnersService = new PartnersService(fakeRepositoryMock.Object); var resultPartners = await partnersService.GetPartners(); Assert.Collection(resultPartners, partners => { Assert.Equal(1, partners.PartnerID); }, partners => { Assert.Equal("JJJ", partners.CompanyName); }); }