def test_directions():
l = lexicon()
assert_equal(l.scan("north"), [('direction', 'north')])
result = l.scan("north south east")
assert_equal(result, [('direction', 'north'), ('direction', 'south'),
('direction', 'east')])
def test_errors():
l = lexicon()
assert_equal(l.scan("ASDFADFASDF"), [('error', 'ASDFADFASDF')])
result = l.scan("bear IAS princess")
assert_equal(result, [('noun', 'bear'), ('error', 'IAS'),
('noun', 'princess')])
def test_numbers():
l = lexicon()
assert_equal(l.scan("1234"), [('number', 1234)])
result = l.scan("3 91234")
assert_equal(result, [('number', 3), ('number', 91234)])
def test_nouns():
l = lexicon()
assert_equal(l.scan("bear"), [('noun', 'bear')])
result = l.scan("bear princess")
assert_equal(result, [('noun', 'bear'), ('noun', 'princess')])
def test_stops():
l = lexicon()
assert_equal(l.scan("the"), [('stop', 'the')])
result = l.scan("the in of")
assert_equal(result, [('stop', 'the'), ('stop', 'in'), ('stop', 'of')])
def test_verbs():
l = lexicon()
assert_equal(l.scan("go"), [('verb', 'go')])
result = l.scan("go kill eat")
assert_equal(result, [('verb', 'go'), ('verb', 'kill'), ('verb', 'eat')])