public void Write_To_Stream()
{
//arrange
var stream = new StringStream();
var order = new WalkDogOrder(new Dog("Santa's Little Helper", true, false), "Springfield", new DateTime(2017, 03, 17), 17.89);
var writer = new WalkDogOrderStreamWriter();
//act
writer.Write(stream, order);
//assert
var content = stream.GetContent();
content.Should().Be("Santa's Little Helper (small) in Springfield at 2017-03-17T00:00:00.0000000 for 17.89$");
}