Attach output as a file on CI (Azure#23025)

Author: pakrym

sdk/core/Azure.Core.TestFramework/src/RecordedTestBase.cs

@@ -9,6 +9,7 @@
 using Castle.DynamicProxy;
 using NUnit.Framework;
 using NUnit.Framework.Interfaces;
+using NUnit.Framework.Internal;
 
 namespace Azure.Core.TestFramework
 {
@@ -79,7 +80,6 @@ public T InstrumentClientOptions<T>(T clientOptions, TestRecording recording = d
         protected string GetSessionFilePath()
         {
             TestContext.TestAdapter testAdapter = TestContext.CurrentContext.Test;
-
             string name = new string(testAdapter.Name.Select(c => s_invalidChars.Contains(c) ? '%' : c).ToArray());
             string additionalParameterName = testAdapter.Properties.ContainsKey(ClientTestFixtureAttribute.RecordingDirectorySuffixKey) ?
                 testAdapter.Properties.Get(ClientTestFixtureAttribute.RecordingDirectorySuffixKey).ToString() :
@@ -153,6 +153,13 @@ public virtual void StartTestRecording()
         [TearDown]
         public virtual void StopTestRecording()
         {
+            if (TestEnvironment.GlobalIsRunningInCI)
+            {
+                var tempFileName = Path.GetTempFileName() + ".txt";
+                File.WriteAllText(tempFileName, TestExecutionContext.CurrentContext.CurrentResult.Output);
+                TestContext.AddTestAttachment(tempFileName, "Test Output");
+            }
+
             bool testPassed = TestContext.CurrentContext.Result.Outcome.Status == TestStatus.Passed;
 
             if (ValidateClientInstrumentation && testPassed)