public void GetHashCode_SourceAndOtherAreDefault_ExpectValuesAreEqual()
{
var source = default(TaggedUnion <RefType, StructType>);
var other = new TaggedUnion <RefType?, StructType>();
var sourceHashCode = source.GetHashCode();
var otherHashCode = other.GetHashCode();
Assert.AreEqual(sourceHashCode, otherHashCode);
}