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Copy pathspeech_streaming_test.py
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# Copyright 2016, Google, Inc.
# 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.
import contextlib
import io
import re
import sys
import time
import pytest
import speech_streaming
class MockAudioStream(object):
def __init__(self, audio_filename, trailing_silence_secs=10):
self.audio_filename = audio_filename
self.silence = io.BytesIO('\0\0' * speech_streaming.RATE *
trailing_silence_secs)
def __enter__(self):
self.audio_file = open(self.audio_filename)
return self
def __exit__(self, *args):
self.audio_file.close()
def __call__(self, *args):
return self
def read(self, num_frames):
# Approximate realtime by sleeping for the appropriate time for the
# requested number of frames
time.sleep(num_frames / float(speech_streaming.RATE))
# audio is 16-bit samples, whereas python byte is 8-bit
num_bytes = 2 * num_frames
chunk = self.audio_file.read(num_bytes) or self.silence.read(num_bytes)
return chunk
def mock_audio_stream(filename):
@contextlib.contextmanager
def mock_audio_stream(channels, rate, chunk):
with open(filename, 'rb') as audio_file:
yield audio_file
return mock_audio_stream
@pytest.mark.skipif(
sys.version_info >= (3, 0),
reason=("grpc doesn't yet support python3 "
'https://github.com/grpc/grpc/issues/282'))
def test_main(resource, monkeypatch, capsys):
monkeypatch.setattr(
speech_streaming, 'record_audio',
mock_audio_stream(resource('quit.raw')))
monkeypatch.setattr(speech_streaming, 'DEADLINE_SECS', 5)
speech_streaming.main()
out, err = capsys.readouterr()
assert re.search(r'transcript.*"quit"', out, re.DOTALL | re.I)