recursion_test.py

# -*- coding: utf-8 -*-
#
# Copyright 2012-2015 Spotify AB
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
from __future__ import print_function

import datetime
from helpers import unittest

import luigi
import luigi.interface
from luigi.mock import MockTarget


class Popularity(luigi.Task):
    date = luigi.DateParameter(default=datetime.date.today() - datetime.timedelta(1))

    def output(self):
        return MockTarget('/tmp/popularity/%s.txt' % self.date.strftime('%Y-%m-%d'))

    def requires(self):
        return Popularity(self.date - datetime.timedelta(1))

    def run(self):
        f = self.output().open('w')
        for line in self.input().open('r'):
            print(int(line.strip()) + 1, file=f)

        f.close()


class RecursionTest(unittest.TestCase):

    def setUp(self):
        MockTarget.fs.get_all_data()['/tmp/popularity/2009-01-01.txt'] = b'0\n'

    def test_invoke(self):
        luigi.build([Popularity(datetime.date(2009, 1, 5))], local_scheduler=True)

        self.assertEqual(MockTarget.fs.get_data('/tmp/popularity/2009-01-05.txt'), b'4\n')