protected override Task <RunSummary> RunTestCollectionAsync( IMessageBus messageBus, ITestCollection testCollection, IEnumerable <IXunitTestCase> testCases, CancellationTokenSource cancellationTokenSource) { var fixture = new CollectionRunner( assemblyFixtureMappings, testCollection, testCases, DiagnosticMessageSink, messageBus, TestCaseOrderer, new ExceptionAggregator(Aggregator), cancellationTokenSource); return(fixture.RunAsync()); }