public void ReturnCollectionOfCities()
{
//Arrange
var resultFromCityRepo = new List <City>()
{
firstCityMock.Object, secondCityMock.Object
};
var expectedList = new List <string>()
{
"TestCityOne", "TestCityTwo"
};
unitOfWork.Setup(x => x.Cities).Returns(cityRepoMock.Object);
cityRepoMock.Setup(repo => repo.All()).Returns(resultFromCityRepo.AsQueryable());
//Act
var cityService = new CityServices(unitOfWork.Object);
var result = cityService.GetCityNames();
//Assert
CollectionAssert.AreEquivalent(expectedList, result.ToList());
}