public async Task RetrieveToken_ExpiredAccessToken_ReturnsExpired()
{
var accessToken = "token1";
var cacheMock = new Mock <ITokenCache>();
var handler = TokenHandler.ExpiredToken();
Func <HttpClient> clientFactory = () => new HttpClient(handler)
{
BaseAddress = new Uri("http://dummy")
};
var sut = new RestTokenProvider(clientFactory, cacheMock.Object);
sut.Initialize(null, null, new Mock <ILogger>().Object);
var tokenResult = await sut.RetrieveTokenAsync(accessToken);
Assert.IsFalse(tokenResult.Success);
Assert.IsTrue(tokenResult.Expired);
}