public void AddMilliseconds_ShouldMimicSystem()
{
var anyDateTimeTicks = 200;
var anyMilliseconds = 5.5d;
var sut = new Abstractions.DateTime(anyDateTimeTicks);
var systemDateTime = new System.DateTime(anyDateTimeTicks);
// Act.
var res = sut.AddMilliseconds(anyMilliseconds);
// Assert.
var expectedResult = systemDateTime.AddMilliseconds(anyMilliseconds);
AssertEquals(expectedResult, res);
}