[POI] fix test (#2581)

Author: xieofxie

skills/csharp/tests/pointofinterestskill.tests/API/AzureMapsGeoSpatialServiceTests.cs

@@ -43,7 +43,7 @@ public async Task GetPointOfInterestDetailsTest()
             var pointOfInterestList = await service.GetNearbyPointOfInterestListAsync(MockData.Latitude, MockData.Longitude);
 
             var pointOfInterest = await service.GetPointOfInterestDetailsAsync(pointOfInterestList[0]);
-            Assert.AreEqual(pointOfInterest.PointOfInterestImageUrl, string.Format("https://atlas.microsoft.com/map/static/png?api-version=1.0&layer=basic&style=main&zoom={2}&center={0},{1}&width=440&height=240&pins=default|la15+50|al0.75|cod83b01||{0} {1}&subscription-key={3}", pointOfInterestList[0].Geolocation.Longitude, pointOfInterestList[0].Geolocation.Latitude, 14, MockData.Key));
+            Assert.AreEqual(pointOfInterest.PointOfInterestImageUrl.Substring(0, 23), "data:image/jpeg;base64,");
         }
 
         [TestMethod]

skills/csharp/tests/pointofinterestskill.tests/API/Fakes/MockHttpClientHandlerGen.cs

@@ -1,4 +1,7 @@
-using System.Linq;
+using System.Drawing;
+using System.Drawing.Imaging;
+using System.IO;
+using System.Linq;
 using System.Net.Http;
 using System.Threading;
 using System.Threading.Tasks;
@@ -150,6 +153,24 @@ private void SetHttpMockBehavior(ref Mock<HttpClientHandler> mockClient)
                {
                    Content = new StringContent(this.GetFoursquareParkingCategory()),
                });
+
+            MemoryStream ms = new MemoryStream();
+            using (var image = new Bitmap(1, 1))
+            {
+                image.SetPixel(0, 0, Color.White);
+                image.Save(ms, ImageFormat.Png);
+            }
+
+            mockClient
+               .Protected()
+               .Setup<Task<HttpResponseMessage>>(
+               MockData.SendAsync,
+               ItExpr.Is<HttpRequestMessage>(r => r.RequestUri.ToString().StartsWith("https://atlas.microsoft.com/map/static/png")),
+               ItExpr.IsAny<CancellationToken>())
+               .ReturnsAsync(() => new HttpResponseMessage()
+               {
+                   Content = new ByteArrayContent(ms.ToArray()),
+               });
         }
 
         private string GetAzureMapsPointOfInterest()