public void DefineSetAndGetLocalValue()
{
ValueEnvironment parent = new ValueEnvironment(ValueEnvironmentType.Public);
ValueEnvironment environment = new ValueEnvironment(parent, ValueEnvironmentType.Local);
environment.SetLocalValue("foo", null);
environment.SetValue("foo", "bar");
Assert.AreEqual("bar", environment.GetValue("foo"));
Assert.IsNull(parent.GetValue("foo"));
}