public static void GetHashCode___Should_return_same_hash_code___When_called_twice_with_null()
{
// Arrange
var systemUnderTest = new NullableDateTimeEqualityComparer();
// Act
var hash1 = systemUnderTest.GetHashCode(null);
var hash2 = systemUnderTest.GetHashCode(null);
// Assert
hash1.Should().Be(hash2);
}
public static void GetHashCode___Should_return_same_hash_code___When_called_twice_on_same_object_reference()
{
// Arrange
DateTime?dateTime = DateTime.UtcNow;
var systemUnderTest = new NullableDateTimeEqualityComparer();
// Act
var hash1 = systemUnderTest.GetHashCode(dateTime);
var hash2 = systemUnderTest.GetHashCode(dateTime);
// Assert
hash1.Should().Be(hash2);
}
public static void GetHashCode___Should_return_same_hash_code___For_DateTime_objects_that_are_equal()
{
// Arrange
DateTime?item1 = DateTime.UtcNow;
DateTime?item2 = new DateTime(((DateTime)item1).Ticks, ((DateTime)item1).Kind);
var systemUnderTest = new NullableDateTimeEqualityComparer();
// Act
var hash1 = systemUnderTest.GetHashCode(item1);
var hash2 = systemUnderTest.GetHashCode(item2);
// Assert
hash1.Should().Be(hash2);
}
public static void GetHashCode___Should_not_throw___When_Nullable_DateTime_is_null()
{
// Arrange
var systemUnderTest = new NullableDateTimeEqualityComparer();
// Act
var hash = Record.Exception(() => systemUnderTest.GetHashCode(null));
// Assert
hash.Should().BeNull();
}
public static void GetHashCode___Should_return_different_hash_code___For_different_DateTime_objects()
{
// Arrange
DateTime?item1a = DateTime.UtcNow;
DateTime?item1b = ((DateTime)item1a).AddTicks(1);
DateTime?item2a = DateTime.Now;
DateTime?item2b = ((DateTime)item2a).AddTicks(1);
DateTime?item3a = new DateTime(DateTime.UtcNow.Ticks, DateTimeKind.Unspecified);
DateTime?item3b = ((DateTime)item3a).AddTicks(1);
DateTime?item4a = DateTime.UtcNow;
DateTime?item4b = new DateTime(((DateTime)item4a).Ticks, DateTimeKind.Local);
DateTime?item5a = DateTime.UtcNow;
DateTime?item5b = new DateTime(((DateTime)item5a).Ticks, DateTimeKind.Unspecified);
DateTime?item6a = DateTime.Now;
DateTime?item6b = new DateTime(((DateTime)item6a).Ticks, DateTimeKind.Unspecified);
var systemUnderTest = new NullableDateTimeEqualityComparer();
// Act
var hash1a = systemUnderTest.GetHashCode(item1a);
var hash1b = systemUnderTest.GetHashCode(item1b);
var hash2a = systemUnderTest.GetHashCode(item2a);
var hash2b = systemUnderTest.GetHashCode(item2b);
var hash3a = systemUnderTest.GetHashCode(item3a);
var hash3b = systemUnderTest.GetHashCode(item3b);
var hash4a = systemUnderTest.GetHashCode(item4a);
var hash4b = systemUnderTest.GetHashCode(item4b);
var hash5a = systemUnderTest.GetHashCode(item5a);
var hash5b = systemUnderTest.GetHashCode(item5b);
var hash6a = systemUnderTest.GetHashCode(item6a);
var hash6b = systemUnderTest.GetHashCode(item6b);
// Assert
hash1a.Should().NotBe(hash1b);
hash2a.Should().NotBe(hash2b);
hash3a.Should().NotBe(hash3b);
hash4a.Should().NotBe(hash4b);
hash5a.Should().NotBe(hash5b);
hash6a.Should().NotBe(hash6b);
}
