Add retry to ApplicationDeployer delete

src/Microsoft.AspNetCore.Server.IntegrationTesting/Common/RetryHelper.cs

@@ -72,5 +72,27 @@ namespace Microsoft.AspNetCore.Server.IntegrationTesting
             logger.LogInformation("Failed to connect, retry limit exceeded.");
             throw new OperationCanceledException("Failed to connect, retry limit exceeded.");
         }
+
+        public static void RetryOperation(
+            Action retryBlock,
+            Action<Exception> exceptionBlock,
+            int retryCount = 3,
+            int retryDelayMilliseconds = 0)
+        {
+            for (var retry = 0; retry < retryCount; ++retry)
+            {
+                try
+                {
+                    retryBlock();
+                    break;
+                }
+                catch (Exception exception)
+                {
+                    exceptionBlock(exception);
+                }
+
+                Thread.Sleep(retryDelayMilliseconds);
+            }
+        }
     }
 }

src/Microsoft.AspNetCore.Server.IntegrationTesting/Deployers/ApplicationDeployer.cs

@@ -90,15 +90,11 @@ namespace Microsoft.AspNetCore.Server.IntegrationTesting
             }
             else
             {
-                try
-                {
-                    // We've originally published the application in a temp folder. We need to delete it.
-                    Directory.Delete(DeploymentParameters.PublishedApplicationRootPath, true);
-                }
-                catch (Exception exception)
-                {
-                    Logger.LogWarning($"Failed to delete directory : {exception.Message}");
-                }
+                RetryHelper.RetryOperation(
+                    () => Directory.Delete(DeploymentParameters.PublishedApplicationRootPath, true),
+                    e => Logger.LogWarning($"Failed to delete directory : {e.Message}"),
+                    retryCount: 3,
+                    retryDelayMilliseconds: 100);
             }
         }