'Make sure that we can read existent non-empty files.'

def test_validFiles(self):

    f1 = self.path.child('file1')
    with f1.open() as f:
        self.assertEqual(f.read(), self.f1content)
    f2 = self.path.child('sub1').child('file2')
    with f2.open() as f:
        self.assertEqual(f.read(), self.f2content)
