from unittest import TestCase
from singplur import singularize, pluralize


class SingplurTest(TestCase):
    pairs = (
        ('branch', 'branches'),
        ('payment', 'payments'),
        ('order', 'orders'),
        ('party', 'parties'),
        ('knife', 'knives'),
        ('roof', 'roofs'),
        ('leaf', 'leaves'),
        ('box', 'boxes'),
        ('sheep', 'sheep'),
        ('salmon', 'salmon'),
        ('person', 'people'),
        ('shoe', 'shoes'),
        ('foot', 'feet'),
        ('dice', 'dices'),
    )

    def test_singularize(self):
        for singular, plural in self.pairs:
            self.assertEqual(singularize(plural), singular)

    def test_pluralize(self):
        for singular, plural in self.pairs:
            self.assertEqual(pluralize(singular), plural)