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Mock DateTime.Now

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16 Answers, 1 is accepted

answered on 20 Sep 2010, 11:54 AM

datetimetest001.zip

Hi zach,

Thank you for submitting the issue. I have prepared a tiny sample with your test code and attached it with the ticket. Please check it out.

In regard to your failing test, please also cross check the following:

As DateTIme is a mscorlib class, there is a MockClassAttribute on top of the test class.
If you are using NUnit and TestDriven.Net , make sure that you have the latest RTM of TestDriven.Net.
Please, make sure that you don’t have other mocking installed that uses profiler which can interfere with JustMock profiler in mocking concrete members.

Please do write back if you have further questions.

Regards,
the Telerik team

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answered on 05 Jan 2012, 06:07 PM

Hello,

I got the same issue here:

[TestClass, MockClass]
public class DateTimeTest
{
    [TestMethod]
    public void GetTimeTest()
    {
        DateTime expectedTime = new DateTime(2011,1,1);
        Mock.Arrange(() => DateTime.Now).Returns(expectedTime);

        Time time = new Time();
        DateTime now = time.GetTime();

        Assert.IsTrue(now.Year == 2011);
        Assert.IsTrue(now.Month == 1);
        Assert.IsTrue(now.Day == 1);
    }

}

public class Time
{
    public DateTime GetTime()
    {
        return DateTime.Now;
    }
}

Is there a way to get this working?

answered on 10 Jan 2012, 09:28 AM

Hi Zach,

Thanks for reporting the problem. At present the only way is to apply the MockClassAttribute on the Time class itself, in order to address nested mscorlib members. Therefore, it will look like:

[TestClass, MockClass]

public class DateTimeTest

{

[TestMethod]

public void GetTimeTest()

{

DateTime expectedTime = new DateTime(2011,1,1);

Mock.Arrange(() => DateTime.Now).Returns(expectedTime);

Time time = new Time();

DateTime now = time.GetTime();

Assert.IsTrue(now.Year == 2011);

Assert.IsTrue(now.Month == 1);

Assert.IsTrue(now.Day == 1);

}

[MockClass]

public class Time

{

public DateTime GetTime()

{

return DateTime.Now;

}

However, a fix for it will be available in the Q1 release where you don’t have to use the attribute at all.

Kind Regards,
Mehfuz
the Telerik team

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answered on 23 Apr 2012, 06:57 PM

Hi Andreas,

Thanks again for bringing up the question.

Mock.SetupStatic is useful if you are doing strict mocking using Behavior.Strict or want to fake the static constructor or by default you want your static calls to act as stub. But this is not required. You can always mock DateTime.Now or any other static method directly inside Mock.Arrange.

In addition, since Datetime, File or FileInfo is in default set of mscorlib members you don’t need to initialize them either using Mock.Initialize. More examples on this can be found here:

http://www.telerik.com/help/justmock/advanced-usage-mscorlib-mocking.html

Kind Regards,
Ricky
the Telerik team

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answered on 22 May 2012, 05:45 AM

Ashampoo-Snap-2012-05-22-01h42m13s-001.png

Ashampoo-Snap-2012-05-22-01h43m05s-002.png

Hi There!

I have downloaded the lastest version of JustMock (commercial) and tried to fake/mock DateTime.Now. It worked fine, but only when I call it straight in a class decorated by "MockClass" attribute. This is a serious problem to me, because when faking this call, I need to extend this it to CLR Infrastructure level. There are a few assemblies in my product wich dont have the source, and I cant decorate it's classes.

Is there any workaround for this kind of situation?
Thank you, and congratulations for such great product

answered on 02 Aug 2012, 06:39 AM

Hi Chris,

this should work:

public class Time
{
    public DateTime GetTime()
    {
        return DateTime.Now;
    }
}

Unit Test:

[TestFixture]
public class DateTimeTest
{
    [Test]
    public void GetTime_Returns_Current_Date()
    {
        DateTime expectedTime = new DateTime(2011, 1, 1);

        Mock.Replace(() => DateTime.Now).In<Time>(x => x.GetTime());

        Mock.Arrange(() => DateTime.Now).Returns(expectedTime);
        Time time = new Time();
        DateTime now = time.GetTime();

        Assert.IsTrue(now.Year == 2011);
        Assert.IsTrue(now.Month == 1);
        Assert.IsTrue(now.Day == 1);
    }

}

answered on 07 Aug 2012, 07:21 AM

I have found an issue with mocking DateTime.Now(may be this is applicable for all mscorlib mocking). Taking the example given above, assuming that GetTime takes an argument of reference type which is defined in another assembly, it's failing. I mean mocking is not happening. Rather, DateTime.Now is actually called. I'm not sure if I'm missing something. Consider the following code. Assuming that "User" class is defined in a different assembly, the mocking is failing.

public class Time
{
    public DateTime GetTime(User user)
    {
        return DateTime.Now;
    }
}

Unit Test:

[TestFixture]
public class DateTimeTest
{
    [Test]
    public void GetTime_Returns_Current_Date()
    {
        DateTime expectedTime = new DateTime(2011, 1, 1);
User user= new User();
        Mock.Replace(() => DateTime.Now).In<Time>(x => x.GetTime(user));

        Mock.Arrange(() => DateTime.Now).Returns(expectedTime);
        Time time = new Time();
        DateTime now = time.GetTime(user);

        Assert.IsTrue(now.Year == 2011);
        Assert.IsTrue(now.Month == 1);
        Assert.IsTrue(now.Day == 1);
    }

}