public void Extensions_PropertValue_UnsetValue()
 {
     var uut = new Dictionary<string, string>();
     Assert.IsNull(uut.PropertyValue("anything"));
 }
 public void Extensions_PropertValue_SetValue()
 {
     var uut = new Dictionary<string, string>();
     uut.Add("anything", "the value");
     Assert.AreEqual("the value", uut.PropertyValue("anything"));
 }