public void Init()
 {
     _importers = new JsonImporterCollection();
     _thing1Importer = new TestImporter(_thing1Type);
     _thing2Importer = new TestImporter(_thing2Type);
 }
 public void Registration()
 {
     Type type = typeof(Thing);
     JsonImporterCollection importers = new JsonImporterCollection();
     Assert.IsNull(importers.Find(type));
     ImportAwareImporter importer = new ImportAwareImporter(type);
     importers.Register(importer);
     Assert.AreSame(importer, importers.Find(type));
 }