public void DefaultEqualsUsesValueEqualityForAllMembers()
{
var s1 = new S3(235, 45);
var s2 = new S3(235, 45);
var s3 = new S3(235, 44);
var s4 = new S4(235, 45);
Assert.IsTrue(s1.Equals(s2), "#1");
Assert.IsFalse(s1.Equals(s3), "#2");
Assert.IsFalse(s1.Equals(s4), "#3");
}