| # |
| # Licensed to the Apache Software Foundation (ASF) under one or more |
| # contributor license agreements. See the NOTICE file distributed with |
| # this work for additional information regarding copyright ownership. |
| # The ASF licenses this file to You 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. |
| # |
| |
| """Unit tests for the write transform.""" |
| |
| # pytype: skip-file |
| |
| import logging |
| import unittest |
| |
| import apache_beam as beam |
| from apache_beam.io import iobase |
| from apache_beam.testing.test_pipeline import TestPipeline |
| from apache_beam.testing.util import assert_that |
| from apache_beam.testing.util import is_empty |
| from apache_beam.transforms.ptransform import PTransform |
| |
| |
| class _TestSink(iobase.Sink): |
| TEST_INIT_RESULT = 'test_init_result' |
| |
| def __init__(self, return_init_result=True, return_write_results=True): |
| self.return_init_result = return_init_result |
| self.return_write_results = return_write_results |
| |
| def initialize_write(self): |
| if self.return_init_result: |
| return _TestSink.TEST_INIT_RESULT |
| |
| def pre_finalize(self, init_result, writer_results): |
| pass |
| |
| def finalize_write( |
| self, init_result, writer_results, unused_pre_finalize_result): |
| self.init_result_at_finalize = init_result |
| self.write_results_at_finalize = writer_results |
| |
| def open_writer(self, init_result, uid): |
| writer = _TestWriter(init_result, uid, self.return_write_results) |
| return writer |
| |
| |
| class _TestWriter(iobase.Writer): |
| STATE_UNSTARTED, STATE_WRITTEN, STATE_CLOSED = 0, 1, 2 |
| TEST_WRITE_RESULT = 'test_write_result' |
| |
| def __init__(self, init_result, uid, return_write_results=True): |
| self.state = _TestWriter.STATE_UNSTARTED |
| self.init_result = init_result |
| self.uid = uid |
| self.write_output = [] |
| self.return_write_results = return_write_results |
| |
| def close(self): |
| assert self.state in ( |
| _TestWriter.STATE_WRITTEN, _TestWriter.STATE_UNSTARTED) |
| self.state = _TestWriter.STATE_CLOSED |
| if self.return_write_results: |
| return _TestWriter.TEST_WRITE_RESULT |
| |
| def write(self, value): |
| if self.write_output: |
| assert self.state == _TestWriter.STATE_WRITTEN |
| else: |
| assert self.state == _TestWriter.STATE_UNSTARTED |
| |
| self.state = _TestWriter.STATE_WRITTEN |
| self.write_output.append(value) |
| |
| |
| class WriteToTestSink(PTransform): |
| def __init__(self, return_init_result=True, return_write_results=True): |
| self.return_init_result = return_init_result |
| self.return_write_results = return_write_results |
| self.last_sink = None |
| self.label = 'write_to_test_sink' |
| |
| def expand(self, pcoll): |
| self.last_sink = _TestSink( |
| return_init_result=self.return_init_result, |
| return_write_results=self.return_write_results) |
| return pcoll | beam.io.Write(self.last_sink) |
| |
| |
| class WriteTest(unittest.TestCase): |
| DATA = ['some data', 'more data', 'another data', 'yet another data'] |
| |
| def _run_write_test( |
| self, data, return_init_result=True, return_write_results=True): |
| write_to_test_sink = WriteToTestSink( |
| return_init_result, return_write_results) |
| with TestPipeline() as p: |
| result = p | beam.Create(data) | write_to_test_sink | beam.Map(list) |
| |
| assert_that(result, is_empty()) |
| |
| sink = write_to_test_sink.last_sink |
| self.assertIsNotNone(sink) |
| |
| def test_write(self): |
| self._run_write_test(WriteTest.DATA) |
| |
| def test_write_with_empty_pcollection(self): |
| data = [] |
| self._run_write_test(data) |
| |
| def test_write_no_init_result(self): |
| self._run_write_test(WriteTest.DATA, return_init_result=False) |
| |
| def test_write_no_write_results(self): |
| self._run_write_test(WriteTest.DATA, return_write_results=False) |
| |
| |
| if __name__ == '__main__': |
| logging.getLogger().setLevel(logging.INFO) |
| unittest.main() |