public void GetExportFactories_With_A_Predicate_Should_Return_Filtered_Results()
{
//Arrange
var catalog = new AggregateCatalog(
new DirectoryCatalog("."),
new AssemblyCatalog(Assembly.GetExecutingAssembly()));
var container = new CompositionContainer(new AssemblyCatalog(Assembly.GetAssembly(typeof(TestMefExtensionHelpers))));
//Act
var myAObjects =
container.GetExportFactories<MyObjectBaseClass, MyMetadataAttribute>(attribute => attribute.Category == "A");
var myBObjects =
container.GetExportFactories<MyObjectBaseClass, MyMetadataAttribute>(attribute => attribute.Category == "B");
var myAObjectWithNameTwo =
container.GetExportFactories<MyObjectBaseClass, MyMetadataAttribute>(attribute => attribute.Category == "A" && attribute.Name == "Two");
//Assert
Assert.Equal(2, myAObjects.Count());
Assert.Equal(1, myBObjects.Count());
Assert.Equal(1, myAObjectWithNameTwo.Count());
//And let's check that we can create a bunch of objects from a factory
Assert.NotNull(myBObjects.First().Create());
Assert.NotNull(myBObjects.First().Create());
Assert.NotNull(myBObjects.First().Create());
Assert.NotNull(myBObjects.First().Create());
//A different change.
}