public void Equals_NullableInt()
{
var comparer = new NullableIntComparer();
EqualityAssert.Equals(null, null, comparer);
EqualityAssert.NotEquals(null, 4, comparer);
EqualityAssert.NotEquals(4, null, comparer);
EqualityAssert.Equals(4, 4, comparer);
EqualityAssert.NotEquals(4, 7, comparer);
}
public void Compare_NullableInt()
{
var comparer = new NullableIntComparer();
CompareAssert.IsEqualTo(null, null, comparer);
CompareAssert.IsLessThan(null, 4, comparer);
CompareAssert.IsGreaterThan(4, null, comparer);
CompareAssert.IsEqualTo(4, 4, comparer);
CompareAssert.IsLessThan(4, 7, comparer);
CompareAssert.IsGreaterThan(4, 2, comparer);
}
public void GetHashCode_NullableInt()
{
var comparer = new NullableIntComparer();
Assert.AreEqual(0, comparer.GetHashCode(null));
var anyNonZero = new int?[] { 3, 7, 12, 45 }
.Select(comparer.GetHashCode)
.Any(hc => hc != 0);
Assert.IsTrue(anyNonZero, allHashCodesZero);
}
public void GetHashCode_NullableInt_NonGeneric()
{
IEqualityComparer comparer = new NullableIntComparer();
Assert.AreEqual(0, comparer.GetHashCode(null));
var anyNonZero = new int?[] { 3, 7, 12, 45 }
.Select(x => comparer.GetHashCode(x))
.Any(hc => hc != 0);
Assert.IsTrue(anyNonZero, allHashCodesZero);
ExceptionAssert.Throws <ArgumentException>(() => comparer.GetHashCode("abc"));
}
public void Equals_NullableInt_NonGeneric()
{
IEqualityComparer comparer = new NullableIntComparer();
Assert.IsTrue(comparer.Equals(null, null));
Assert.IsFalse(comparer.Equals(null, 4));
Assert.IsFalse(comparer.Equals(4, null));
Assert.IsTrue(comparer.Equals(4, 4));
Assert.IsFalse(comparer.Equals(4, 7));
ExceptionAssert.Throws <ArgumentException>(() => comparer.Equals(null, "abc"));
ExceptionAssert.Throws <ArgumentException>(() => comparer.Equals("abc", null));
ExceptionAssert.Throws <ArgumentException>(() => comparer.Equals("abc", "abc"));
ExceptionAssert.Throws <ArgumentException>(() => comparer.Equals("abc", "xyz"));
}
public void Compare_NullableInt_NonGeneric()
{
IComparer comparer = new NullableIntComparer();
Assert.AreEqual(0, Math.Sign(comparer.Compare(null, null)));
Assert.AreEqual(-1, Math.Sign(comparer.Compare(null, 4)));
Assert.AreEqual(1, Math.Sign(comparer.Compare(4, null)));
Assert.AreEqual(0, Math.Sign(comparer.Compare(4, 4)));
Assert.AreEqual(-1, Math.Sign(comparer.Compare(4, 7)));
Assert.AreEqual(1, Math.Sign(comparer.Compare(4, 2)));
ExceptionAssert.Throws <ArgumentException>(() => comparer.Compare(null, "abc"));
ExceptionAssert.Throws <ArgumentException>(() => comparer.Compare("abc", null));
ExceptionAssert.Throws <ArgumentException>(() => comparer.Compare("abc", "abc"));
ExceptionAssert.Throws <ArgumentException>(() => comparer.Compare("abc", "xyz"));
}