KZAnalogClock.cs

public class KZAnalogClock {
    public int GetHour();
    public int GetMinute();
    public int GetSecond();

    public void SetTime(int h, int m);
    public void SetTime(int h, int m, int s);

    public void SetHourAngle(float angle); //hour effects hour only
    public void SetMinuteAngle(float angle); //minute effects hour
    public void SetSecondAngle(float angle); //second effects minute & hour

    public float GetHourAngle();
    public float GetMinuteAngle();
    public float GetSecondAngle();
}

public class Test {
    [Test]
    public void TestClock() {
        KZAnalogClock clock = new KZAnalogClock();
        clock.SetTime(0, 0);
        Assert.That(clock.GetHourAngle(), Is.EqualTo(90));
        Assert.That(clock.GetMinuteAngle(), Is.EqualTo(90));

        clock.SetTime(3, 0);
        Assert.That(clock.GetHourAngle(), Is.EqualTo(0));
        Assert.That(clock.GetMinuteAngle(), Is.EqualTo(90));

        clock.SetTime(6, 0);
        Assert.That(clock.GetHourAngle(), Is.EqualTo(-45));
        Assert.That(clock.GetMinuteAngle(), Is.EqualTo(90));

        clock.SetTime(9, 0);
        Assert.That(clock.GetHourAngle(), Is.EqualTo(180));
        Assert.That(clock.GetMinuteAngle(), Is.EqualTo(90));
    }
}