public void TestGetEnumerator()
{
var wrapper = new BsonDocumentWrapper(new BsonDocument("x", 1));
Assert.AreEqual(false, wrapper.IsMaterialized);
var enumerator = wrapper.GetEnumerator();
Assert.AreEqual(true, wrapper.IsMaterialized);
Assert.IsTrue(enumerator.MoveNext());
Assert.AreEqual("x", enumerator.Current.Name);
Assert.AreEqual(new BsonInt32(1), enumerator.Current.Value);
Assert.IsFalse(enumerator.MoveNext());
}