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name : CustomDateMatcher.py
 import sys

sys.path.append("..")

from hamcrest.core.base_matcher import BaseMatcher
from hamcrest.core.helpers.hasmethod import hasmethod

from hamcrest import *
import unittest
import datetime


class IsGivenDayOfWeek(BaseMatcher):
    """Matches dates that fall on a given day of the week."""

    def __init__(self, day):
        self.day = day  # Monday is 0, Sunday is 6

    def _matches(self, item):
        """Test whether item matches."""
        if not hasmethod(item, "weekday"):
            return False
        return item.weekday() == self.day

    def describe_to(self, description):
        """Describe the matcher."""
        day_as_string = [
            "Monday",
            "Tuesday",
            "Wednesday",
            "Thursday",
            "Friday",
            "Saturday",
            "Sunday",
        ]
        description.append_text("calendar date falling on ").append_text(day_as_string[self.day])


def on_a_saturday():
    """Factory function to generate Saturday matcher."""
    return IsGivenDayOfWeek(5)


class SampleTest(unittest.TestCase):
    def testDateIsOnASaturday(self):
        """Example of successful match."""
        d = datetime.date(2008, 4, 26)
        assert_that(d, is_(on_a_saturday()))

    def testFailsWithMismatchedDate(self):
        """Example of what happens with date that doesn't match."""
        d = datetime.date(2008, 4, 6)
        assert_that(d, is_(on_a_saturday()))

    def testFailsWithNonDate(self):
        """Example of what happens with object that isn't a date."""
        d = "oops"
        assert_that(d, is_(on_a_saturday()))


if __name__ == "__main__":
    unittest.main()
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