@Test
public void testRemoveWordsStartingNumber() {

	// Given
	String tweet = "it's 15PM we're in the 20th century";
	TwitterTokenizer tokenizer = new TwitterTokenizer();
	// When
	List<String> actualTokens = tokenizer.tokenize(tweet);
	// Then
	List<String> expectedTokens = Arrays.asList("we'r", "centuri");
	assertEquals(expectedTokens, actualTokens);
}