public void TestTryGetValue()
{
var wrapper = new BsonDocumentWrapper(new BsonDocument("x", 1));
Assert.AreEqual(false, wrapper.IsMaterialized);
BsonValue value;
var result = wrapper.TryGetValue("x", out value);
Assert.AreEqual(true, wrapper.IsMaterialized);
Assert.AreEqual(true, result);
Assert.AreEqual(new BsonInt32(1), value);
}