def test_errors():
assert lex.scan("bear IAS princess 3890md") == [('noun', 'bear'),
('error', 'IAS'),
('noun', 'princess'),
('error', '3890md')]
def test_capitalization():
assert lex.scan(('29456 BEar DowN KiLL')) == [('number', 29456),
('noun', 'bear'),
('direction', 'down'),
('verb', 'kill')]
def test_directions():
assert lex.scan("north south east down up") == [('direction', 'north'),
('direction', 'south'),
('direction', 'east'),
('direction', 'down'),
('direction', 'up')]
def test_numbers():
assert lex.scan("3 91234") == [('number', 3), ('number', 91234)]
def test_nouns():
assert lex.scan("bear princess") == [('noun', 'bear'),
('noun', 'princess')]
def test_stops():
assert lex.scan("the in of") == [('stop', 'the'), ('stop', 'in'),
('stop', 'of')]
def test_verbs():
assert lex.scan("go kill eat") == [('verb', 'go'), ('verb', 'kill'),
('verb', 'eat')]