public void ThrowArgumentNullException_WhenNullValueIsPassed()
{
var contextOptions = new DbContextOptionsBuilder <DealershipContext>()
.UseInMemoryDatabase(databaseName:
"EditModelCorrectly_WhenValidParametersArePassed").Options;
string[] invalidParameters = null;
IEditCarService sut;
using (var dealershipContext = new DealershipContext(contextOptions))
{
var carServiceStub = new Mock <ICarService>();
sut = new Dealership.Services.EditCarService(dealershipContext, carServiceStub.Object);
}
Assert.ThrowsException <ArgumentNullException>(() => sut.EditHorsePower(invalidParameters));
}