Test file for chapter 49 of Learning Python The Hard Way

parser_test.py

from nose.tools import *
from ex48 import parser

def test_sentence():
	s1 = parser.Sentence(('noun', 'bear'), ('verb', 'kill'), ('direction', 'north'))
	assert_equal(s1.subject, 'bear')
	assert_equal(s1.verb, 'kill')
	assert_equal(s1.object, 'north')

def test_peek():
	s1 = [('noun', 'bear'), ('verb', 'kill'), ('direction', 'north')]
	p1 = parser.peek(s1)
	p2 = parser.peek(s1)
	assert_equal =(p1, 'noun')
	assert_equal = (p2, 'noun')

def test_match():
	s1 = [('noun', 'bear'), ('verb', 'kill'), ('direction', 'north')]
	m1 = parser.match(s1, 'verb')
	assert_equal(m1, None)
	m2 = parser.match(s1, 'verb')
	assert_equal(m2[0], 'verb')
	m3 = parser.match(s1, 'direction')
	assert_equal(m3[0], 'direction')
	assert_raises(AttributeError, parser.match, 'yellow', 'blue')

def test_skip():
	s1 = [('noun', 'bear'), ('verb', 'kill'), ('direction', 'north')]
	parser.skip(s1, 'noun')
	parser.skip(s1, 'verb')
	assert_equal(s1, [('direction', 'north')])

def test_parse_verb():
	s1 = [('verb', 'kill'), ('noun', 'bear')]
	verb = parser.parse_verb(s1)
	assert_equal(verb, ('verb', 'kill'))
	s2 = [('noun', 'door')]
	assert_raises(parser.ParserError, parser.parse_verb, s2)

def test_parse_object():
	s1 = [('noun', 'bear'), ('verb', 'kill'), ('noun', 'bear')]
	assert_equal(parser.parse_object(s1), ('noun', 'bear'))
	s2 = [('direction', 'up'), ('noun', 'bear')]
	assert_equal(parser.parse_object(s2), ('direction', 'up'))
	s3 = [('verb', 'kill'), ('noun', 'bear')]
	assert_raises(parser.ParserError, parser.parse_object, s3)

def test_parse_subject():
	s1 = [('noun', 'bear'), ('verb', 'kill'), ('noun', 'bear')]
	assert_equal(parser.parse_subject(s1), ('noun', 'bear'))
	s2 = [('verb', 'kill'), ('noun', 'bear')]
	assert_equal(parser.parse_subject(s2), ('noun', 'player'))
	s3 = [('direction', 'up'), ('noun', 'bear')]
	assert_raises(parser.ParserError, parser.parse_subject, s3)

def test_sentence():
	x = parser.parse_sentence([('noun', 'bear'), ('verb', 'eat'), ('stop', 'the'), ('noun', 'honey')])
	assert_equal(x.subject, 'bear')
	assert_equal(x.verb, 'eat')
	assert_equal(x.object, 'honey')