public void RemoveFeature_ItemSetFeatures2Items1__ReturnsItemHasNotFeature()
{
// arrange
List <string> featureNames = new List <string> {
"F1", "F2"
};
ItemNumericalSet set = new ItemNumericalSet(featureNames);
ItemNumerical i = set.CreateItem();
i.SetValue("F1", 3.2);
i.SetValue("F2", 1.1);
set.AddItem(i);
// act
bool r = set.RemoveFeature("F2");
// assert
Assert.AreEqual(true, r & !i.HasValue("F2"));
}