public void Equals_String()
{
var comparer = new OrdinalStringComparer();
EqualityAssert.Equals(null, null, comparer);
EqualityAssert.NotEquals(null, "abc", comparer);
EqualityAssert.NotEquals("abc", null, comparer);
EqualityAssert.Equals("abc", "abc", comparer);
EqualityAssert.NotEquals("abc", "xyz", comparer);
}
public void Compare_String()
{
var comparer = new OrdinalStringComparer();
CompareAssert.IsEqualTo(null, null, comparer);
CompareAssert.IsLessThan(null, "abc", comparer);
CompareAssert.IsGreaterThan("abc", null, comparer);
CompareAssert.IsEqualTo("abc", "abc", comparer);
CompareAssert.IsLessThan("abc", "xyz", comparer);
CompareAssert.IsGreaterThan("abc", "a", comparer);
}
public void GetHashCode_String()
{
var comparer = new OrdinalStringComparer();
Assert.AreEqual(0, comparer.GetHashCode(null));
var anyNonZero = new [] { "abc", "xyz", "pqr" }
.Select(comparer.GetHashCode)
.Any(hc => hc != 0);
Assert.IsTrue(anyNonZero, allHashCodesZero);
}
public void GetHashCode_String_NonGeneric()
{
IEqualityComparer comparer = new OrdinalStringComparer();
Assert.AreEqual(0, comparer.GetHashCode(null));
var anyNonZero = new[] { "abc", "xyz", "pqr" }
.Select(comparer.GetHashCode)
.Any(hc => hc != 0);
Assert.IsTrue(anyNonZero, allHashCodesZero);
ExceptionAssert.Throws <ArgumentException>(() => comparer.GetHashCode(4));
}
public void Equals_String_NonGeneric()
{
IEqualityComparer comparer = new OrdinalStringComparer();
Assert.IsTrue(comparer.Equals(null, null));
Assert.IsFalse(comparer.Equals(null, "abc"));
Assert.IsFalse(comparer.Equals("abc", null));
Assert.IsTrue(comparer.Equals("abc", "abc"));
Assert.IsFalse(comparer.Equals("abc", "xyz"));
ExceptionAssert.Throws <ArgumentException>(() => comparer.Equals(null, 4));
ExceptionAssert.Throws <ArgumentException>(() => comparer.Equals(4, null));
ExceptionAssert.Throws <ArgumentException>(() => comparer.Equals(4, 4));
ExceptionAssert.Throws <ArgumentException>(() => comparer.Equals(4, 7));
}
public void Compare_String_NonGeneric()
{
IComparer comparer = new OrdinalStringComparer();
Assert.AreEqual(0, Math.Sign(comparer.Compare(null, null)));
Assert.AreEqual(-1, Math.Sign(comparer.Compare(null, "abc")));
Assert.AreEqual(1, Math.Sign(comparer.Compare("abc", null)));
Assert.AreEqual(0, Math.Sign(comparer.Compare("abc", "abc")));
Assert.AreEqual(-1, Math.Sign(comparer.Compare("abc", "xyz")));
Assert.AreEqual(1, Math.Sign(comparer.Compare("abc", "a")));
ExceptionAssert.Throws <ArgumentException>(() => comparer.Compare(null, 4));
ExceptionAssert.Throws <ArgumentException>(() => comparer.Compare(4, null));
ExceptionAssert.Throws <ArgumentException>(() => comparer.Compare(4, 4));
ExceptionAssert.Throws <ArgumentException>(() => comparer.Compare(4, 7));
}
