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'''Unit tests for amountchangedpattern.py.'''


import re
import unittest


from webkitpy.common.watchlist.amountchangedpattern import AmountChangedPattern


class AmountChangedPatternTest(unittest.TestCase):

    # A quick note about the diff file structure.
    # The first column indicated the old line number.
    # The second column indicates the new line number.
    # 0 in either column indicates it had no old or new line number.
    _DIFF_FILE = ((0, 1, 'hi hi'),
                  (1, 0, 'bye hi'),
                  (2, 2, 'other hi'),
                  (3, 0, 'both'),
                  (0, 3, 'both'),
                  )

    def run_amount_changed_pattern_match(self, pattern, index_for_zero_value):
        return AmountChangedPattern(re.compile(pattern), index_for_zero_value).match(None, self._DIFF_FILE)

    def test_added_lines(self):
        self.assertTrue(self.run_amount_changed_pattern_match('hi', 0))
        self.assertTrue(self.run_amount_changed_pattern_match('hi hi', 0))
        self.assertFalse(self.run_amount_changed_pattern_match('other', 0))
        self.assertFalse(self.run_amount_changed_pattern_match('both', 0))
        self.assertFalse(self.run_amount_changed_pattern_match('bye', 0))
        self.assertFalse(self.run_amount_changed_pattern_match('MatchesNothing', 0))

    def test_removed_lines(self):
        self.assertFalse(self.run_amount_changed_pattern_match('hi', 1))
        self.assertFalse(self.run_amount_changed_pattern_match('hi hi', 1))
        self.assertFalse(self.run_amount_changed_pattern_match('other', 1))
        self.assertFalse(self.run_amount_changed_pattern_match('both', 1))
        self.assertTrue(self.run_amount_changed_pattern_match('bye', 1))
        self.assertFalse(self.run_amount_changed_pattern_match('MatchesNothing', 1))