public new void GetHashCode()
{
var obj1 = new Testing(5, "ABC");
var obj2 = new Testing(3, "NA");
var obj3 = new Testing(2, "ABCDE");
var obj4 = new Testing(5, "NA");
var obj5 = new Testing(7, null);
var comparer = new EqualityComparerStateful <int>((lhs, rhs) => lhs == rhs, obj => obj.GetHashCode());
Assert.Equal(comparer.GetHashCode(5), 5.GetHashCode());
Assert.Equal(comparer.GetHashCode(3), 3.GetHashCode());
Assert.Equal(comparer.GetHashCode(67), 67.GetHashCode());
var stringComparer = new EqualityComparerStateful <string>((lhs, rhs) => lhs == rhs);
Assert.Equal(stringComparer.GetHashCode("ABC"), "ABC".GetHashCode());
Assert.Equal(stringComparer.GetHashCode("CBA"), "CBA".GetHashCode());
Assert.Equal(stringComparer.GetHashCode("abcd"), "abcd".GetHashCode());
Assert.Equal(stringComparer.GetHashCode(null), 0);
var objComparer = new EqualityComparerStateful <Testing>((lhs, rhs) => lhs.A == rhs.A, obj => obj.A.GetHashCode() * 2);
Assert.Equal(objComparer.GetHashCode(obj1), obj1.A.GetHashCode() * 2);
Assert.Equal(objComparer.GetHashCode(obj2), obj2.A.GetHashCode() * 2);
Assert.Equal(objComparer.GetHashCode(obj3), obj3.A.GetHashCode() * 2);
Assert.Equal(objComparer.GetHashCode(obj4), obj4.A.GetHashCode() * 2);
Assert.Equal(objComparer.GetHashCode(obj5), obj5.A.GetHashCode() * 2);
}
public void Equals()
{
var comparer = new EqualityComparerStateful <int>((lhs, rhs) => lhs == rhs);
Assert.True(comparer.Equals(1, 1));
Assert.True(comparer.Equals(-1, -1));
Assert.False(comparer.Equals(-1, 1));
Assert.False(comparer.Equals(1, -1));
Assert.False(comparer.Equals(2, 1));
Assert.False(comparer.Equals(-2, -1));
Assert.False(comparer.Equals(1, 2));
Assert.False(comparer.Equals(-1, -2));
Assert.False(comparer.Equals(2, -1));
Assert.False(comparer.Equals(-2, 1));
Assert.False(comparer.Equals(1, -2));
Assert.False(comparer.Equals(-1, 2));
var stringComparer = new EqualityComparerStateful <string>((lhs, rhs) => lhs == rhs);
Assert.True(stringComparer.Equals("ABC", "ABC"));
Assert.True(stringComparer.Equals(null, null));
Assert.False(stringComparer.Equals("ABC", "abc"));
Assert.False(stringComparer.Equals("abc", "ABC"));
Assert.False(stringComparer.Equals("ABC", "CBA"));
Assert.False(stringComparer.Equals("ABCD", "ABC"));
Assert.False(stringComparer.Equals("ABC", "ABCD"));
Assert.False(stringComparer.Equals("ABC", null));
Assert.False(stringComparer.Equals(null, "ABC"));
var objComparer = new EqualityComparerStateful <Testing>((lhs, rhs) => lhs.B.Length == rhs.A);
var obj1 = new Testing(5, "ABC");
var obj2 = new Testing(3, "NA");
var obj3 = new Testing(2, "ABCDE");
Assert.True(objComparer.Equals(obj1, obj2));
Assert.False(objComparer.Equals(obj1, obj3));
Assert.False(objComparer.Equals(obj2, obj1));
Assert.True(objComparer.Equals(obj2, obj3));
Assert.True(objComparer.Equals(obj3, obj1));
Assert.False(objComparer.Equals(obj3, obj2));
}
