public void NullsAreEqual()
{
var falseComparer = new DelegateEqualityComparer <ExampleClass>((c1, c2) => false);
var result = falseComparer.Equals(null, null);
Assert.That(result, Is.True);
}
public void SelfIsAlwaysEqualWithSelf()
{
var self = new ExampleClass();
var falseComparer = new DelegateEqualityComparer <ExampleClass>((c1, c2) => false);
var result = falseComparer.Equals(self, self);
Assert.That(result, Is.True);
}
public void NullWithNonNullIsAlwaysUnequal()
{
var otherClass = new ExampleClass();
var trueComparer = new DelegateEqualityComparer <ExampleClass>((c1, c2) => true);
var result = trueComparer.Equals(null, otherClass);
Assert.That(result, Is.False);
}
public void EqualsCallsTheProvidedDelegate()
{
var comparerWasCalled = false;
Func<string, string, bool> comparer = (string x, string y) =>
{
comparerWasCalled = true;
return true;
};
var sut = new DelegateEqualityComparer<string>(comparer, this.defaultHash);
sut.Equals("test", "test");
Assert.True(comparerWasCalled);
}
public void CanMakeEqualityTest()
{
var first = new ExampleClass {
Number = 1, Word = "Hat"
};
var second = new ExampleClass {
Number = 1, Word = "Sock"
};
var comparer = new DelegateEqualityComparer <ExampleClass>((c1, c2) => c1.Number == c2.Number);
var defaultEquals = first == second;
var result = comparer.Equals(first, second);
Assume.That(defaultEquals, Is.False);
Assert.That(result, Is.True);
}
public static void AddRange <T, TSort, TEquality>(
this ObservableCollection <T> target,
IEnumerable <T> collection,
Func <T, TSort> sortSelector,
Func <T, TEquality> equalitySelector)
where TSort : IComparable
{
var sortComparer = new DelegateComparer <T>(
(x, y) => sortSelector(x).CompareTo(sortSelector(y)));
var equalityComparer = new DelegateEqualityComparer <T>(
(x, y) => equalitySelector(x).Equals(equalitySelector(y)));
var index = target.Count - 1;
foreach (var addItem in collection.OrderBy(sortSelector))
{
if (index < 0)
{
target.Insert(0, addItem);
}
else
{
while (index >= 0)
{
var currentItem = target[index];
if (sortComparer.Compare(currentItem, addItem) >= 0)
{
if (equalityComparer.Equals(currentItem, addItem) != true)
{
target.Insert(index + 1, addItem);
}
break;
}
index -= 1;
}
}
}
}
public void Equals_CompareEqualTwoIntegers_ReturnTrue()
{
var comparer = new DelegateEqualityComparer <int>((value1, value2) => value1 == value2);
Assert.True(comparer.Equals(1234, 1234));
}
public void Equals_CompareNotEqualTwoIntegers_ReturnFalse()
{
var comparer = new DelegateEqualityComparer <int>((value1, value2) => value1 == value2);
Assert.False(comparer.Equals(1234, 2345));
}
