public void GetHashCodeTest()
{
var time0 = new DateTime(2000, 1, 1, 0, 0, 0, DateTimeKind.Utc);
var time1 = new DateTime(2015, 12, 31, 0, 0, 0, DateTimeKind.Utc);
var range0 = new DateTimeRange(time0, time1);
var range1 = new DateTimeRange(time0, time1);
var range2 = new DateTimeRange(time0, new DateTime(2016, 1, 1, 0, 0, 0, DateTimeKind.Utc));
Assert.AreNotEqual(0.0, range0.GetHashCode());
Assert.AreEqual(range0.GetHashCode(), range1.GetHashCode());
Assert.AreNotEqual(range0.GetHashCode(), range2.GetHashCode());
}
public void GetHashCode_ShouldReturnUniqueHashCode()
{
// Arrange.
var start = new DateTime(2001, 1, 1, 1, 0, 0, 0, DateTimeKind.Local);
var oneMillisecondLater = start.AddMilliseconds(1);
var twoMillisecondsLater = start.AddMilliseconds(2);
var tomorrow = start.AddDays(1);
var nextWeek = start.AddDays(7);
var nextYear = start.AddYears(1);
var minValue = DateTime.MinValue;
var maxValue = DateTime.MaxValue;
var oneMillisecondRange = new DateTimeRange(start, oneMillisecondLater);
var twoMillisecondRange = new DateTimeRange(start, twoMillisecondsLater);
var oneDayRange = new DateTimeRange(start, tomorrow);
var oneWeekRange = new DateTimeRange(start, nextWeek);
var oneYearRange = new DateTimeRange(start, nextYear);
var maxRange = new DateTimeRange(minValue, maxValue);
// Act.
var results = new Int32[]
{
oneMillisecondRange.GetHashCode(),
twoMillisecondRange.GetHashCode(),
oneDayRange.GetHashCode(),
oneWeekRange.GetHashCode(),
oneYearRange.GetHashCode(),
maxRange.GetHashCode()
};
// Assert.
results.Should().OnlyHaveUniqueItems();
}
public void ReturnDifferentHashForDifferentValues()
{
var nowTicks = DateTimeOffset.UtcNow.Ticks;
var offset = DateTimeOffset.UtcNow.Offset;
var a = new DateTimeRange(
new DateTimeOffset(nowTicks, offset),
new DateTimeOffset(nowTicks + 1, offset));
var b = new DateTimeRange(
new DateTimeOffset(nowTicks, offset),
new DateTimeOffset(nowTicks + 2, offset));
Assert.AreNotEqual(a.GetHashCode(), b.GetHashCode());
}
public void ReturnEqualHashForIdenticalValues()
{
var nowTicks = DateTimeOffset.UtcNow.Ticks;
var offset = DateTimeOffset.UtcNow.Offset;
var a = new DateTimeRange(
new DateTimeOffset(nowTicks, offset),
new DateTimeOffset(nowTicks + 1, offset));
var b = new DateTimeRange(
new DateTimeOffset(nowTicks, offset),
new DateTimeOffset(nowTicks + 1, offset));
Assert.AreEqual(a.GetHashCode(), b.GetHashCode());
}
public void HashCodeIsAccurate()
{
// arrange
var start = DateTime.Now.AddDays(-30);
var end = DateTime.Now.AddDays(30);
var range = new DateTimeRange(start, end);
// act
var startHash = start.GetHashCode() * 397;
var endHash = end.GetHashCode();
var rangeHash = range.GetHashCode();
var areEqual = rangeHash == (startHash ^ endHash);
// assert
areEqual.Should().BeTrue();
}
public int GetHashCode(object x)
{
DateTimeRange value = (DateTimeRange)x;
return(value.GetHashCode());
}
