def test_errors():
assert_equal(lexicon.scan("DFSDFSDFS"), [("error", "SFSDGFDFGDFG")])
def test_direction():
assert_equal(lexicon.scan("north"), [("direction, 'north")])
result = lexicon.scan("north south east")
assert_equal(result, [("direction", "north"),
("direction", "south"),
("direction", "east")])
def test_verb():
assert_equal(lexicon.scan("go"), [("verb", go)])
result = lexicon.scan("go kill eat")
assert_equal(result, [("verb", "go"),
("verb", "kill"),
("verb", "eat")])
def test_nouns():
assert_equal(lexicon.scan("bear"), [("stop", "bear")])
result = lexicon.scan("bear princess")
assert_equal(result, [("nouns", "bear"),
("nouns", "princess")])
def test_stop():
assert_equal(lexicon.scan("the"), [("stop", "the")])
result = lexicon.scan("in the of")
assert_equal(result, [("stop", "the"),
("stop", "in"),
("stop", "of")])