Question

I am wondering how to you test TimeZone logic? For me my timezone stuff is used to filter data from the database(what of course in unit tests gets mocked up and not tested).

But I would like to test the logic around it to see if I give certain times in that it would be converted right.

I am not sure how to do this though.

Answer 1

public class ClassToTest
{
    public Func<TimeZone> TimeZoneProvider = () => TimeZone.CurrentTimeZone;

    public void MethodToTest()
    {
        var timeZone = TimeZoneProvider();
        // Do something with the time zone
    }
}

[TestMethod]
public void Test()
{
    // Arrange
    var sut = new ClassToTest();
    sut.TimeZoneProvider = () => ... // return the time zone you would like for the test

    // Act
    sut.MethodToTest();

    // Assert
    // ...
}

---

EDIT: Another alternative would be to use constructor injection to pass a time zone into your class:

public class ClassToTest
{
    private readonly TimeZone _timeZone;
    public ClassToTest(TimeZone timeZone)
    {
        _timeZone = timeZone;
    }

    public void MethodToTest()
    {
        // Do something with _timeZone
    }
}

[TestMethod]
public void Test()
{
    // Arrange
    var timeZone = ... // return the time zone you would like for the test
    var sut = new ClassToTest(timeZone);

    // Act
    sut.MethodToTest();

    // Assert
    // ...
}