Can someone assist me in writing a unit test for the code in orange. I am trying to write a unit test for the CompositionContainer and ComposePart
//An aggregate catalog that combines multiple catalogs
var catalog = new AggregateCatalog();
//Adds all the parts found in the same assembly as the current class
catalog.Catalogs.Add(new AssemblyCatalog(typeof(this).Assembly));
//If parts are placed at some other location then adds that directory path
catalog.Catalogs.Add(new DirectoryCatalog(componentsDirectoryPath));
//Create the CompositionContainer with the parts in the catalog CompositionContainer _container = new CompositionContainer(catalog);
//Fill the imports of this object
this._container.ComposeParts(this);