use immoery channel for func tests to increase stability

test/EmptyApp20.FunctionalTests/Startup.cs

@@ -21,6 +21,7 @@
 
             var builder = new ConfigurationBuilder();
             builder.AddApplicationInsightsSettings(instrumentationKey: InProcessServer.IKey, endpointAddress: endpointAddress.ConnectionString, developerMode: true);
+            services.AddSingleton(typeof(ITelemetryChannel), new InMemoryChannel());
             services.AddApplicationInsightsTelemetry(builder.Build());
         }
 

test/MVCFramework20.FunctionalTests/Startup.cs

@@ -33,6 +33,7 @@ namespace MVCFramework20.FunctionalTests
             applicationInsightsOptions.EndpointAddress = endpointAddress.ConnectionString;
             applicationInsightsOptions.InstrumentationKey = InProcessServer.IKey;
 
+            services.AddSingleton(typeof(ITelemetryChannel), new InMemoryChannel());
             services.AddApplicationInsightsTelemetry(applicationInsightsOptions);
             services.AddMvc();
         }

test/WebApi20.FunctionalTests/Startup.cs

@@ -3,7 +3,7 @@ using Microsoft.AspNetCore.Hosting;
 using Microsoft.Extensions.Configuration;
 using Microsoft.Extensions.DependencyInjection;
 using FunctionalTestUtils;
-
+using Microsoft.ApplicationInsights.Channel;
 
 namespace WebApi20.FunctionalTests
 {
@@ -24,6 +24,7 @@ namespace WebApi20.FunctionalTests
 
             var builder = new ConfigurationBuilder();
             builder.AddApplicationInsightsSettings(instrumentationKey: InProcessServer.IKey, endpointAddress: endpointAddress.ConnectionString, developerMode: true);
+            services.AddSingleton(typeof(ITelemetryChannel), new InMemoryChannel());
             services.AddApplicationInsightsTelemetry(builder.Build());
 
             services.AddMvc();