public async Task GetAddressByCountryShouldReturnOkIfFoundInDatabase() { // Arrange var country = "Polska"; var address = new Address() { Id = 1, Country = country, City = "Sopot", Street = "Ciasna", BuildingNumber = "1", FlatNumber = "69", PostalCode = "80-765" }; mockRepo.Setup(x => x.Address).Returns(_addressRepoMock.Object); _addressRepoMock.Setup(x => x.GetAddressByCountry(country)).ReturnsAsync(new[] { address }); // Act var result = await _sut.GetAddressByCountry(country); // Assert Assert.IsType <OkObjectResult>(result); Assert.IsNotType <NotFoundResult>(result); }