public void ReplaceFeatureTest()
        {
            Feature     testingFeature = new DoubleFeature(new AbsoluteDistance(), 2.0);
            Feature     replacement    = new DoubleFeature(new AbsoluteDistance(), 6.0);
            Observation testingObs     = new Observation(1);

            testingObs.AddFeature(testingFeature);
            testingObs.ReplaceFeature(0, replacement);

            Assert.AreSame(replacement, testingObs.GetFeature(0));
            Assert.AreEqual(6.0, testingObs.GetFeature(0).FeatureValue);
        }