public void TestComparerEquality()
{
Func <string, string, bool> sameLength = (a, b) => a.Length == b.Length;
Func <string, int> getLength = s => s.Length;
ComparersTest.TestEquality(EqualityComparers.Create(sameLength, getLength), EqualityComparers.Create(sameLength, getLength), EqualityComparers.Create(getLength));
ComparersTest.TestEquality(EqualityComparers.Create(getLength), EqualityComparers.Create(getLength, EqualityComparer <int> .Default), EqualityComparers.Create((string s) => s[0]));
ComparersTest.TestEquality(EqualityComparers.GetReferenceComparer <string>(), EqualityComparers.GetReferenceComparer <string>(), EqualityComparer <string> .Default);
ComparersTest.TestEquality(EqualityComparers.GetCollectionComparer(EqualityComparer <string> .Default), EqualityComparers.GetCollectionComparer <string>(), EqualityComparers.GetCollectionComparer(StringComparer.OrdinalIgnoreCase));
ComparersTest.TestEquality(EqualityComparers.GetSequenceComparer(StringComparer.Ordinal), EqualityComparers.GetSequenceComparer(StringComparer.Ordinal), EqualityComparers.GetCollectionComparer(StringComparer.Ordinal));
}
public void TestReferenceComparer()
{
var referenceComparer = EqualityComparers.GetReferenceComparer <string>();
Assert.Same(referenceComparer, EqualityComparers.GetReferenceComparer <string>());
referenceComparer.Equals(new string('a', 1), new string('a', 1)).ShouldEqual(false);
var text = new string('a', 1);
referenceComparer.Equals(text, text).ShouldEqual(true);
referenceComparer.GetHashCode(text).ShouldEqual(referenceComparer.GetHashCode(text));
referenceComparer.Equals(text, null).ShouldEqual(false);
referenceComparer.Equals(null, null).ShouldEqual(true);
var obj = new object();
EqualityComparers.GetReferenceComparer <object>().GetHashCode(obj)
.ShouldEqual(obj.GetHashCode());
}