public void TestUpdate()
{
IExternalSurrogate s1 = new CGuidSurrogate();
IExternalSurrogate s2 = new CDateTimeSurrogate();
IExternalSurrogate s3 = new CUtcDateTimeSurrogate();
IExternalSurrogate accum = null;
accum = CExternalSurrogatePair.Update(accum, null);
Assert.IsNull(accum, "Updating NULL with NULL should result in NULL");
accum = CExternalSurrogatePair.Update(accum, s1);
Assert.AreSame(s1, accum, "After UPDATEing null with s1, the accumulator should be s1");
accum = CExternalSurrogatePair.Update(accum, null);
Assert.AreSame(s1, accum, "After UPDATEing the s1 accumulator with NULL, the accumulator should not have changed");
accum = CExternalSurrogatePair.Update(accum, s2);
Assert.AreEqual(typeof(CExternalSurrogatePair), accum.GetType(), "After UPDATEing accumulator with s2, the accumulator should now be a surrogate Pair.");
Assert.AreSame(s1, (accum as CExternalSurrogatePair).Surrogate1, "The first surrogate of the Pair should be s1");
Assert.AreSame(s2, (accum as CExternalSurrogatePair).Surrogate2, "The second surrogate of the Pair should be s2");
accum = CExternalSurrogatePair.Update(accum, s3);
Assert.AreEqual(typeof(CExternalSurrogatePair), accum.GetType(), "After UPDATEing accumulator with s3, the accumulator should still be a surrogate Pair.");
Assert.AreEqual(typeof(CExternalSurrogatePair), (accum as CExternalSurrogatePair).Surrogate1.GetType(), "The Type of the first surrogate of the Pair should be a Pair");
Assert.AreEqual(typeof(CUtcDateTimeSurrogate), (accum as CExternalSurrogatePair).Surrogate2.GetType(), "The Type of the second surrogate of the Pair should be the UTC Time surrogate");
}
public void TestConstructor()
{
IExternalSurrogate s1 = new CGuidSurrogate();
IExternalSurrogate s2 = new CDateTimeSurrogate();
var pair = new CExternalSurrogatePair(s1, s2);
Assert.AreSame(s1, pair.Surrogate1, "Surrogate1 does not point to the same object");
Assert.AreSame(s2, pair.Surrogate2, "Surrogate2 does not point to the same object");
}