def test_preprocessing_bag_of_words(self):
		"""
		bag_of_words will return a scipy.frequency_term.csr.csr_matrix so test for these attrs.
		
		"""
		
		preprocessor = TextPreprocessor(self.articles)
		x_train_counts = preprocessor.bag_of_words()
		self.assertTrue(hasattr(x_train_counts, 'shape'))