Berufsschule_HAM/tests/Berufsschule_HAM.E2ETests/RetryFactAttribute.cs

using System;
using Xunit;
using Xunit.Abstractions;
using Xunit.Sdk;

namespace Berufsschule_HAM.E2ETests;

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(
        IMessageSink diagnosticMessageSink,
        TestMethodDisplay defaultMethodDisplay,
        TestMethodDisplayOptions defaultMethodDisplayOptions,
        ITestMethod testMethod,
        int maxRetries)
        : base(diagnosticMessageSink, defaultMethodDisplay, defaultMethodDisplayOptions, 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++)
        {
            try
            {                
                var result = await base.RunAsync(
                    diagnosticMessageSink, messageBus, constructorArguments, aggregator, cancellationTokenSource);

                summary.Aggregate(result);

                if (result.Failed == 0)
                    break; // success, stop retrying
            } catch (Exception) {}
        }

        return summary;
    }
}

public class RetryFactDiscoverer : IXunitTestCaseDiscoverer
{
    private readonly IMessageSink _diagnosticMessageSink;

    public RetryFactDiscoverer(IMessageSink diagnosticMessageSink)
    {
        _diagnosticMessageSink = diagnosticMessageSink;
    }

    public IEnumerable<IXunitTestCase> Discover(ITestFrameworkDiscoveryOptions discoveryOptions,
                                                ITestMethod testMethod,
                                                IAttributeInfo factAttribute)
    {
        var maxRetries = factAttribute.GetNamedArgument<int>("MaxRetries");
        yield return new RetryTestCase(
        _diagnosticMessageSink,
        discoveryOptions.MethodDisplayOrDefault(),
        discoveryOptions.MethodDisplayOptionsOrDefault(),
        testMethod,
        maxRetries);
    }
}