public void TestAddMetricDataPoint()
{
var httpResponseMock = new Mock <HttpResponse>();
var headerDictionary = new HeaderDictionary();
httpResponseMock.SetupGet(m => m.Headers).Returns(headerDictionary);
Extensions.AddMetricDataPoint(httpResponseMock.Object, null);
Assert.Empty(headerDictionary);
Extensions.AddMetricDataPoint(httpResponseMock.Object, new DataPoint());
Assert.Empty(headerDictionary);
var dp = BuildDataPoint();
httpResponseMock.Object.AddMetricDataPoint(dp);
Assert.Single(headerDictionary);
var header = headerDictionary.First();
Assert.StartsWith("sfx_metric_datapoint-", header.Key);
Assert.Equal(JsonConvert.SerializeObject(dp), header.Value);
}