/// <summary>
/// Overload that imports using a SingleObjectImporter and checks that the expected
/// implementing type was imported.
/// </summary>
/// <remarks>This method can be used if the import being tested doesn't specify an explicit contract name.
/// If it does use an explicit contract name you will need to call the other overload and supply an
/// importer with a property with the appropriate [Import("MyContractName")] attribute.</remarks>
public static SingleObjectImporter <TImportType> CheckTypeCanBeImported <TTypeToCheck, TImportType>(
IEnumerable <Export> optionalExports,
IEnumerable <Export> requiredExports)
where TImportType : class
where TTypeToCheck : class
{
SingleObjectImporter <TImportType> importer = new SingleObjectImporter <TImportType>();
CheckTypeCanBeImported <TTypeToCheck, TImportType>(importer, optionalExports, requiredExports);
importer.AssertImportIsNotNull();
importer.AssertImportIsInstanceOf <TTypeToCheck>();
return(importer);
}
public void MefCtor_CheckExports()
{
var batch = new CompositionBatch();
var serviceProvider = MefTestHelpers.CreateExport <SVsServiceProvider>(Mock.Of <IServiceProvider>());
batch.AddExport(serviceProvider);
var helperImport = new SingleObjectImporter <IProjectSystemHelper>();
var vsHierarchyLocator = new SingleObjectImporter <IVsHierarchyLocator>();
batch.AddPart(helperImport);
batch.AddPart(vsHierarchyLocator);
var catalog = new TypeCatalog(typeof(ProjectSystemHelper));
using var container = new CompositionContainer(catalog);
container.Compose(batch);
helperImport.Import.Should().NotBeNull();
vsHierarchyLocator.Import.Should().NotBeNull();
helperImport.Import.Should().BeSameAs(vsHierarchyLocator.Import);
}