from unittest import TestCase
from src.validation import validate, REWRITE_SUCCESS, REWRITE_FAILURE, \
        REWRITE_INVALID, REWRITE_CHECKED


class TestValidation(TestCase):

    # TODO: test REWRITE_INVALID (because a BisonSyntaxError is thrown now).
    #def test_INVALID(self):
    #    self.assertEqual(validate('3a +', '3a'), REWRITE_INVALID)

    def test_simple_CHECKED(self):
        self.assertEqual(validate('3a + a', '4a'), (REWRITE_CHECKED, 0))

    def test_simple_failure(self):
        self.assertEqual(validate('3a + a', '4a + 1'), (REWRITE_FAILURE, 0))

    def test_intermediate_success(self):
        self.assertEqual(validate('3a + a + b + 2b', '4a + 3b'),
                         (REWRITE_CHECKED, 0))
        self.assertEqual(validate('a / b / (c / d)', '(ad) / (bc)'),
                         (REWRITE_CHECKED, 0))

    def test_intermediate_failure(self):
        self.assertEqual(validate('3a + a + b + 2b', '4a + 4b'),
                         (REWRITE_FAILURE, 0))

    # TODO: this test fails due 'maximum recursion depth exceeded'.
    def test_indefinite_integral(self):
        self.assertEqual(validate('int_2^4 x^2', '4^3/3 - 2^3/3'),
                         (REWRITE_SUCCESS, 0))

    def test_advanced_failure(self):
        self.assertEqual(validate('(x-1)^3+(x-1)^3', '4a+4b'),
                         (REWRITE_FAILURE, 0))