sample.cs

[TestCase("15 °", "-10 °", 25, typeof(Degrees))]
[TestCase("-10 °", "15 °", -25, typeof(Degrees))]
[TestCase("-10 °", "0 °", -10, typeof(Degrees))]
[TestCase("-90 °", "1.5707 rad", -3.1414, typeof(Radians))]
[TestCase("1.5707 rad", "-90 °", 3.1414, typeof(Radians))]
[TestCase("1.5707 rad", "1.5707 rad", 0, typeof(Radians))]
public void SubtractionTest(string lvs, string rvs, double ev, Type et)
{
    var lv = AngleUnitValue.Parse(lvs);
    var rv = AngleUnitValue.Parse(rvs);
    var diff = lv - rv;
    Assert.AreEqual(ev, diff.Value, 1e-3);
    Assert.AreEqual(et, diff.Unit.GetType());
}