public void Should_save_data()
{
_serviceMock.Setup(mock => mock.Save(It.IsAny <string>(), It.IsAny <DiffContent>()));
const string id = "dsgfdsfsdfasdf";
var left = new byte[] { 4, 5, 6 };
var right = new byte[] { 3, 8, 7, 9 };
var model = new DiffModel(_serviceMock.Object, id).SetLeft(left).SetRight(right);
model.Save();
_serviceMock.Verify(mock => mock.Save(It.IsAny <string>(), It.IsAny <DiffContent>()), Times.Once());
_serviceMock.Verify(mock => mock.Save(id, It.Is <DiffContent>(actual => actual.Left == left && actual.Right == right)));
}
