Added RetryFactAttribute

tests/Berufsschule_HAM.E2ETests/RetryFactAttribute.cs

@@ -0,0 +1,49 @@
+using System;
+using Xunit;
+using Xunit.Abstractions;
+using Xunit.Sdk;
+
+namespace Berufsschule_HAM.E2ETests;
+
+[XunitTestCaseDiscoverer("YourNamespace.RetryFactDiscoverer", "YourAssemblyName")]
+public class RetryFactAttribute(int maxRetries = 5) : FactAttribute
+{
+    public int MaxRetries { get; } = maxRetries;
+}
+
+public class RetryTestCase : XunitTestCase
+{
+    private int _maxRetries;
+
+    [Obsolete("Called by the de-serializer", true)]
+    public RetryTestCase() { }
+
+    public RetryTestCase(int maxRetries, ITestMethod testMethod)
+        : base(new NullMessageSink(), TestMethodDisplay.Method, TestMethodDisplayOptions.None, testMethod)
+    {
+        _maxRetries = maxRetries;
+    }
+
+    public override async Task<RunSummary> RunAsync(
+        IMessageSink diagnosticMessageSink,
+        IMessageBus messageBus,
+        object[] constructorArguments,
+        ExceptionAggregator aggregator,
+        CancellationTokenSource cancellationTokenSource)
+    {
+        var summary = new RunSummary();
+
+        for (int i = 1; i <= _maxRetries; i++)
+        {
+            var result = await base.RunAsync(
+                diagnosticMessageSink, messageBus, constructorArguments, aggregator, cancellationTokenSource);
+
+            summary.Aggregate(result);
+
+            if (result.Failed == 0)
+                break; // success, stop retrying
+        }
+
+        return summary;
+    }
+}