public void UpdateAccounts_ShouldReturnAccounts_WhenAccountExists() { //Arrange _httpMessageHandlerMock .Protected() .Setup <Task <HttpResponseMessage> >("SendAsync", ItExpr.IsAny <HttpRequestMessage>(), ItExpr.IsAny <CancellationToken>()) .Returns(Task.FromResult(new HttpResponseMessage(HttpStatusCode.OK) { StatusCode = HttpStatusCode.OK, Content = new StringContent( @"{""serverTime"":1592395836992}") })) .Verifiable(); _httpMessageHandlerMock .Protected() .Setup <Task <HttpResponseMessage> >("SendAsync", ItExpr.IsAny <HttpRequestMessage>(), ItExpr.IsAny <CancellationToken>()) .Returns(Task.FromResult(new HttpResponseMessage(HttpStatusCode.OK) { StatusCode = HttpStatusCode.OK, Content = new StringContent( @"{""makerCommission"": 10,""takerCommission"": 10,""buyerCommission"": 0,""sellerCommission"": 0, ""canTrade"": true,""canWithdraw"": true,""canDeposit"": true,""updateTime"": 1561284536404,""accountType"": ""MARGIN"", ""balances"": [ {""asset"": ""BTC"",""free"": ""0.00000000"",""locked"": ""0.00000000""}, {""asset"": ""LTC"",""free"": ""0.00000000"",""locked"": ""0.00000000""}, {""asset"": ""ETH"",""free"": ""0.00000000"",""locked"": ""0.00000000""}], ""permissions"": [""SPOT""]}") })) .Verifiable(); HttpClient httpClient = new HttpClient(_httpMessageHandlerMock.Object); _connectionAdapter.HttpClient = httpClient; Binance subjectUnderTest = new Binance { ConnectionAdapter = _connectionAdapter }; //Act subjectUnderTest.UpdateAccountsAsync().Wait(); Assert.IsNotNull(subjectUnderTest.BinanceAccount); }