def test_errors():
assert_equals(lexicon.scan('ASDFADFASDF'), [('error', 'ASDFADFASDF')])
def test_sentence():
result = lexicon.scan('go north and kill the bear 9 times')
assert_equals(result, [('verb', 'go'), ('direction', 'north'),
('stop', 'and'), ('verb', 'kill'), ('stop', 'the'),
('noun', 'bear'), ('number', '9'),
('error', 'times')])
def test_number():
assert_equals(lexicon.scan('1234'), [('number', '1234')])
result = lexicon.scan('3 91234')
assert_equals(result, [('number', '3'), ('number', '91234')])
def test_nouns():
assert_equals(lexicon.scan("bear"), [('noun', 'bear')])
result = lexicon.scan("bear princess")
assert_equals(result, [('noun', 'bear'), ('noun', 'princess')])
def test_stops():
assert_equals(lexicon.scan('the'), [('stop', 'the')])
result = lexicon.scan("the in of")
assert_equals(result, [('stop', 'the'), ('stop', 'in'), ('stop', 'of')])
def test_verbs():
assert_equal(lexicon.scan('go'), [('verb', 'go')])
result = lexicon.scan("go kill EAT")
assert_equals(result, [('verb', 'go'), ('verb', "kill"), ('verb', "EAT")])
def test_directions():
assert_equal(lexicon.scan("north"), [("direction", "north")])
result = lexicon.scan("north south east")
assert_equal(result, [('direction', 'north'), ('direction', 'south'),
('direction', 'east')])