private void AssertValidRequest(string uri, HttpRequestMessage r, HttpMethod method = null)
{
if (method == null)
{
method = HttpMethod.Get;
}
Assert.AreEqual(r.Method, method);
Assert.AreEqual(r.RequestUri.ToString(), client.BaseUrl + uri);
Assert.IsNotNull(r.Headers.Authorization);
Assert.IsNotNull(r.Headers.UserAgent);
Assert.AreEqual(r.Headers.UserAgent.ToString(), client.GetUserAgent());
Assert.AreEqual(r.Headers.Accept.ToString(), "application/json");
}