public void GetStreetsReturnsListOfStreets()
{
//Arrange
var moq = new Mock <ICityRepository>();
moq.Setup(m => m.GetStreets(It.IsAny <int>())).Returns(Task.FromResult(new List <Street>() as IEnumerable <Street>));
CitiesController controller = new CitiesController(moq.Object);
//Act
var result = controller.GetStreets(3).Result;
//Assert
Assert.IsInstanceOfType(result, typeof(IEnumerable <Street>));
}