gistfile1.cs

[TestClass]
public class DateTimeExtensionTest
{
    [TestMethod]
    public void FiveMinAgoShouldBeBeforeCurrent()
    {
        var current = DateTime.Now;
        var fiveMinAgo = current.AddMinutes(-5);

        Assert.IsTrue(fiveMinAgo.IsBefore(current));
        Assert.IsFalse(current.IsBefore(fiveMinAgo));
    }

    [TestMethod]
    public void FiveMinAfterShouldBeAfterCurrent()
    {
        var current = DateTime.Now;
        var fiveMinAfter = current.AddMinutes(5);

        Assert.IsTrue(fiveMinAfter.IsAfter(current));
        Assert.IsFalse(current.IsAfter(fiveMinAfter));
    }

    [TestMethod]
    public void YesterdayShouldBeBeforeDateOfToday()
    {
        var today = DateTime.Today;
        var yesterday = today.AddDays(-1);
        Assert.IsTrue(yesterday.IsBeforeDate(today));
        Assert.IsFalse(today.IsBeforeDate(yesterday));

        var current = DateTime.Now;
        var fiveMinAgo = current.AddMinutes(-5);
        Assert.IsFalse(current.IsBeforeDate(fiveMinAgo));
        Assert.IsFalse(fiveMinAgo.IsBeforeDate(current));
    }

    [TestMethod]
    public void TomorrowShouldBeAfterDateOfToday()
    {
        var today = DateTime.Today;
        var tomorrow = today.AddDays(1);
        Assert.IsTrue(tomorrow.IsAfterDate(today));
        Assert.IsFalse(today.IsAfterDate(tomorrow));

        var current = DateTime.Now;
        var fiveMinAfter = current.AddMinutes(5);
        Assert.IsFalse(current.IsAfterDate(fiveMinAfter));
        Assert.IsFalse(fiveMinAfter.IsAfterDate(current));
    }
}