Facebook functional test fixes (#5931)

* Enable triggers in FB test

* Add "Clear the message queue" to test

FunctionalTests/Microsoft.Bot.Builder.FunctionalTests/FacebookChatTests.cs

@@ -29,6 +29,9 @@ namespace Microsoft.Bot.Builder.FunctionalTests
         {
             GetEnvironmentVars();
 
+            // Clear the message queue in case of an old message.
+            await ReceiveMessageAsync();
+
             var echoGuid = Guid.NewGuid().ToString();
             await SendMessageAsync(echoGuid);
 
@@ -38,7 +41,7 @@ namespace Microsoft.Bot.Builder.FunctionalTests
         }
 
         private async Task SendMessageAsync(string echoGuid)
-        {            
+        {
             using (var client = new HttpClient())
             using (var request = new HttpRequestMessage())
             {
@@ -52,7 +55,7 @@ namespace Microsoft.Bot.Builder.FunctionalTests
                 request.RequestUri = new Uri(_botEndpoint);
 
                 await client.SendAsync(request);
-            }            
+            }
         }
 
         private async Task<string> ReceiveMessageAsync()

build/yaml/botbuilder-dotnet-ci-facebook-test.yml

@@ -8,29 +8,29 @@ name: $(Build.BuildId)
 pool:
   vmImage: $[ coalesce( variables['VMImage'], 'windows-2019' ) ] # or 'windows-latest' or 'vs2017-win2016'
 
-# trigger: # ci trigger
-#   batch: true
-#   branches:
-#     include:
-#     - main
-#   paths:
-#     include:
-#     - '*'
-#     exclude:
-#     - doc/
-#     - specs/
-#     - Changes.md
-#     - LICENSE
-#     - README.md
-#     - UsingMyGet.md
+trigger: # ci trigger
+  batch: true
+  branches:
+    include:
+    - main
+  paths:
+    include:
+    - '*'
+    exclude:
+    - doc/
+    - specs/
+    - Changes.md
+    - LICENSE
+    - README.md
+    - UsingMyGet.md
 
-# pr: # pr trigger
-#   branches:
-#     include:
-#     - main
-#   paths:
-#     include:
-#     - build/yaml/botbuilder-dotnet-ci-facebook-test.yml
+pr: # pr trigger
+  branches:
+    include:
+    - main
+  paths:
+    include:
+    - build/yaml/botbuilder-dotnet-ci-facebook-test.yml
 
 variables:
   AppId: $(FacebookTestBotAppId)