@Test
public void throwsWhenFilenameDoesNotStartWithANumber() throws Exception {

	FilenameParser parser = new FilenameParser();
	try {
	parser.extractIdFromFilename("blah blah blah");
	fail("expected exception");
	} catch (UnrecognisedFilenameException e) {
		assertEquals("Could not extract a change script number from filename: blah blah blah", e.getMessage() );
	}
}