def test_by_equality(self):
"""
The ``by_equality`` utility method takes a list of strings and produces
a matcher that matches those strings by equality sequentially.
"""
matcher = OrderedLinesMatcher.by_equality('foo', 'bar')
self.assertFalse(matcher('bar'))
self.assertFalse(matcher('foo'))
self.assertFalse(matcher('baz'))
self.assertTrue(matcher('bar'))
def test_exhaustion(self):
"""
Once all matchers have been matched, further calls to ``match`` should
raise an error.
"""
matcher = OrderedLinesMatcher.by_equality('foo')
self.assertTrue(matcher('foo'))
with self.assertRaises(RuntimeError) as cm:
matcher('bar')
self.assertEqual(str(cm.exception),
'Matcher exhausted, no more matchers to use')