public async Task GetAllAdministrationStatuses_Valid_Test() { // Arrange _cityParticipantsService .Setup(c => c.GetAdministrationStatuses(It.IsAny <string>())) .ReturnsAsync(It.IsAny <IEnumerable <CityAdministrationStatusDTO> >()); CitiesController citycon = CreateCityController; // Act var result = await citycon.GetAllAdministrationStatuses(GetStringFakeId()); // Assert Assert.NotNull(result); Assert.IsInstanceOf <OkObjectResult>(result); }