Fixes failing tests

Author: Andrew Omondi (from Dev Box)

tests/Microsoft.Graph.DotnetCore.Test/Requests/Functional/ErrorTests.cs

@@ -11,7 +11,7 @@ public async Task ErrorThrottlingError()
             // To get a throttling error, I mocked up a 429 response in a text file and turned on the Fiddler
             // autoresponder to return the text file as the response envelope. The autoresponder for this 
             // scenario responds to EXACT:https://graph.microsoft.com/v1.0/groups/036bd54c-c6e5-43eb-b8b5-03e019e75bd1
-            ServiceException e = await Assert.ThrowsAsync<ServiceException>(async () => await graphClient.Groups["036bd54c-c6e5-43eb-b8b5-03e019e75bd1"].GetAsync(requestConfiguration => requestConfiguration.Headers.Add("client-request-id", "dddddddd-dddd-dddd-dddd-dddddddddddd")));
+            ServiceException e = await Assert.ThrowsAsync<ServiceException>(() => graphClient.Groups["036bd54c-c6e5-43eb-b8b5-03e019e75bd1"].GetAsync(requestConfiguration => requestConfiguration.Headers.Add("client-request-id", "dddddddd-dddd-dddd-dddd-dddddddddddd")));
 
             Assert.Contains("tooManyRetries", e.Message);
         }

tests/Microsoft.Graph.DotnetCore.Test/Requests/Generated/CollectionReferencesRequestTests.cs

@@ -78,7 +78,7 @@ public async System.Threading.Tasks.Task AddAsync_IdRequired()
             ).Returns(new JsonSerializationWriter());  
 
 
-            await Assert.ThrowsAsync<ODataError>(async () => await graphServiceClient.Groups["groupId"].Members.Ref.PostAsync(userToCreate));
+            await Assert.ThrowsAsync<ODataError>(() => graphServiceClient.Groups["groupId"].Members.Ref.PostAsync(userToCreate));
 
         }