public static void EqualityOperators()
{
var s1 = new string(new char[] { 'a' });
var s1a = new string(new char[] { 'a' });
var s2 = new string(new char[] { 'b' });
Assert.True(s1 == s1a);
Assert.False(s1 != s1a);
Assert.False(s1 == s2);
Assert.True(s1 != s2);
}