protected override async Task AfterTestAssemblyStartingAsync() {
await base.AfterTestAssemblyStartingAsync();
_assemblyLoaders = AssemblyLoaderAttribute.GetAssemblyLoaders(TestAssembly.Assembly);
var assembly = TestAssembly.Assembly;
var importedAssemblyFixtureTypes = assembly.GetCustomAttributes(typeof (AssemblyFixtureImportAttribute))
.SelectMany(ai => ai.GetConstructorArguments())
.OfType<Type[]>()
.SelectMany(a => a);
var assemblyFixtureTypes = assembly.GetTypes(false)
.Where(t => t.GetCustomAttributes(typeof(AssemblyFixtureAttribute).AssemblyQualifiedName).Any())
.Select(t => t.ToRuntimeType())
.Concat(importedAssemblyFixtureTypes)
.ToList();
var fixtures = new Dictionary<Type, object>();
foreach (var type in assemblyFixtureTypes) {
await Aggregator.RunAsync(() => AddAssemblyFixtureAsync(fixtures, type));
}
_assemblyFixtureMappings = new ReadOnlyDictionary<Type, object>(fixtures);
}