public void Folders_Should_Indicate_Whether_They_Are_Empty_Or_Not()
{
//the test folder is not empty, but contains not sub folders and files
testFolder.RefreshMetaData();
Assert.IsFalse(testFolder.MetaData.IsEmpty);
//add sub folder to folder a
folderA.AddFolder("x");
folderA.RefreshMetaData();
Assert.IsFalse(folderA.MetaData.IsEmpty);
//add sub files to folder b
folderA.AddFile(Context.DownloadFile0Template.FullName, "xxx.bin", false);
folderA.RefreshMetaData();
Assert.IsFalse(folderA.MetaData.IsEmpty);
//folder c is still empty
folderC.RefreshMetaData();
Assert.IsTrue(folderC.MetaData.IsEmpty);
}