Log extra CertificateOperation events received (Azure#20668)

Test run failed over the weekend that had extra events. Not sure where they came from, so log them if the count isn't right.

Author: heaths

sdk/keyvault/Azure.Security.KeyVault.Certificates/tests/CertificateOperationTests.cs

@@ -5,6 +5,7 @@
 using System.Collections.Generic;
 using System.Diagnostics.Tracing;
 using System.Linq;
+using System.Text;
 using System.Text.Json;
 using System.Threading;
 using System.Threading.Tasks;
@@ -69,7 +70,7 @@ public async Task UpdateStatusCompleted()
 
             // Begin
             IEnumerable<EventWrittenEventArgs> messages = _listener.EventsById(CertificatesEventSource.BeginUpdateStatusEvent);
-            Assert.AreEqual(1, messages.Count());
+            AssertMessageCount(1, messages);
 
             EventWrittenEventArgs message = messages.Last();
             Assert.AreEqual(EventLevel.Verbose, message.Level);
@@ -80,7 +81,7 @@ public async Task UpdateStatusCompleted()
 
             // End
             messages = _listener.EventsById(CertificatesEventSource.EndUpdateStatusEvent);
-            Assert.AreEqual(1, messages.Count());
+            AssertMessageCount(1, messages);
 
             message = messages.Last();
             Assert.AreEqual(EventLevel.Verbose, message.Level);
@@ -129,7 +130,7 @@ public async Task UpdateStatusEventuallyCompleted()
 
             // End
             messages = _listener.EventsById(CertificatesEventSource.EndUpdateStatusEvent);
-            Assert.AreEqual(10, messages.Count());
+            AssertMessageCount(10, messages);
 
             message = messages.Last();
             Assert.AreEqual(EventLevel.Verbose, message.Level);
@@ -162,7 +163,7 @@ public async Task UpdateStatusCanceled()
 
             // Begin
             IEnumerable<EventWrittenEventArgs> messages = _listener.EventsById(CertificatesEventSource.BeginUpdateStatusEvent);
-            Assert.AreEqual(5, messages.Count());
+            AssertMessageCount(5, messages);
 
             EventWrittenEventArgs message = messages.Last();
             Assert.AreEqual(EventLevel.Verbose, message.Level);
@@ -173,7 +174,7 @@ public async Task UpdateStatusCanceled()
 
             // End
             messages = _listener.EventsById(CertificatesEventSource.EndUpdateStatusEvent);
-            Assert.AreEqual(5, messages.Count());
+            AssertMessageCount(5, messages);
 
             message = messages.Last();
             Assert.AreEqual(EventLevel.Verbose, message.Level);
@@ -206,7 +207,7 @@ public async Task UpdateStatusDeleted()
 
             // Begin
             IEnumerable<EventWrittenEventArgs> messages = _listener.EventsById(CertificatesEventSource.BeginUpdateStatusEvent);
-            Assert.AreEqual(5, messages.Count());
+            AssertMessageCount(5, messages);
 
             EventWrittenEventArgs message = messages.Last();
             Assert.AreEqual(EventLevel.Verbose, message.Level);
@@ -217,7 +218,7 @@ public async Task UpdateStatusDeleted()
 
             // End
             messages = _listener.EventsById(CertificatesEventSource.EndUpdateStatusEvent);
-            Assert.AreEqual(5, messages.Count());
+            AssertMessageCount(5, messages);
 
             message = messages.Last();
             Assert.AreEqual(EventLevel.Verbose, message.Level);
@@ -250,7 +251,7 @@ public async Task UpdateStatusErred()
 
             // Begin
             IEnumerable<EventWrittenEventArgs> messages = _listener.EventsById(CertificatesEventSource.BeginUpdateStatusEvent);
-            Assert.AreEqual(5, messages.Count());
+            AssertMessageCount(5, messages);
 
             EventWrittenEventArgs message = messages.Last();
             Assert.AreEqual(EventLevel.Verbose, message.Level);
@@ -261,7 +262,7 @@ public async Task UpdateStatusErred()
 
             // End
             messages = _listener.EventsById(CertificatesEventSource.EndUpdateStatusEvent);
-            Assert.AreEqual(5, messages.Count());
+            AssertMessageCount(5, messages);
 
             message = messages.Last();
             Assert.AreEqual(EventLevel.Verbose, message.Level);
@@ -271,6 +272,21 @@ public async Task UpdateStatusErred()
             Assert.AreEqual("mock failure message", message.GetProperty<string>("error"));
         }
 
+        private static void AssertMessageCount(int expected, IEnumerable<EventWrittenEventArgs> messages)
+        {
+            int actual = messages.Count();
+            if (actual != expected)
+            {
+                StringBuilder sb = new StringBuilder($"Expected {expected} messages; got {actual}\nMessages:\n");
+                foreach (EventWrittenEventArgs message in messages)
+                {
+                    sb.AppendFormat("- {0} ({1}): {2}\n", message.EventName, message.EventId, message.Message);
+                }
+
+                Assert.Fail(sb.ToString());
+            }
+        }
+
         private CertificateClient CreateClient(HttpPipelineTransport transport)
         {
             CertificateClientOptions options = new CertificateClientOptions