public void TestUInt16ToSByteOrDefault()
{
// Test conversion of source type minimum value
UInt16 source = UInt16.MinValue;
Assert.IsInstanceOfType(source, typeof(UInt16));
SByte?result = source.ToSByteOrDefault((sbyte)86);
Assert.AreEqual((sbyte)0, result);
Assert.IsInstanceOfType(result, typeof(SByte));
// Test conversion of source type value 42 to target type
source = (ushort)42;
Assert.IsInstanceOfType(source, typeof(UInt16));
result = source.ToSByteOrDefault((sbyte)86);
Assert.AreEqual((sbyte)42, result);
Assert.IsInstanceOfType(result, typeof(SByte));
// Test conversion of source type maximum value
source = UInt16.MaxValue;
Assert.IsInstanceOfType(source, typeof(UInt16));
result = source.ToSByteOrDefault((sbyte)86);
// Here we would expect this conversion to fail (and return the default value of (sbyte)86),
// since the source type's maximum value (65535) is greater than the target type's maximum value (127).
Assert.AreEqual((sbyte)86, result);
Assert.IsInstanceOfType(result, typeof(SByte));
}