feat(ui-tests): add retry helper

Author: Franz-Fischbach

ui-tests/Utils/RetryHelpers.cs

@@ -0,0 +1,58 @@
+using System;
+using System.Threading.Tasks;
+
+namespace UtTestsExperimentalConsoleAppication.Utils;
+
+/// <summary>
+/// Helper utilities for retrying flaky asynchronous operations.
+/// </summary>
+public static class RetryHelpers
+{
+    /// <summary>
+    /// Repeatedly executes an asynchronous condition until it returns <c>true</c>
+    /// or the retry count is exhausted.
+    /// </summary>
+    /// <param name="condition">The asynchronous predicate to evaluate.</param>
+    /// <param name="maxAttempts">Maximum number of attempts.</param>
+    /// <param name="delayMs">Delay in milliseconds between attempts.</param>
+    /// <exception cref="TimeoutException">Thrown when the condition never evaluates to <c>true</c>.</exception>
+    public static async Task RetryAsync(Func<Task<bool>> condition, int maxAttempts = 50, int delayMs = 100)
+    {
+        for (int attempt = 0; attempt < maxAttempts; attempt++)
+        {
+            if (await condition())
+            {
+                return;
+            }
+            await Task.Delay(delayMs);
+        }
+        throw new TimeoutException($"Condition was not satisfied after {maxAttempts} attempts.");
+    }
+
+    /// <summary>
+    /// Repeatedly invokes an asynchronous action until it completes without
+    /// throwing an exception or the retry count is exceeded.
+    /// </summary>
+    /// <param name="action">The asynchronous action to execute.</param>
+    /// <param name="maxAttempts">Maximum number of attempts.</param>
+    /// <param name="delayMs">Delay in milliseconds between attempts.</param>
+    /// <exception cref="Exception">Rethrows the last exception when retries are exhausted.</exception>
+    public static async Task RetryAsync(Func<Task> action, int maxAttempts = 50, int delayMs = 100)
+    {
+        Exception? lastError = null;
+        for (int attempt = 0; attempt < maxAttempts; attempt++)
+        {
+            try
+            {
+                await action();
+                return;
+            }
+            catch (Exception ex)
+            {
+                lastError = ex;
+            }
+            await Task.Delay(delayMs);
+        }
+        throw new TimeoutException($"Action failed after {maxAttempts} attempts", lastError);
+    }
+}