Allow disabling tests that require network access #955
Description
Overview
We are packaging PyAV for NixOS and to verify our integration works out we run the test suite. Since our builds are sandboxed and have no network access, a large part of the test suite fails, because it wants to download data from FATE. Those tests errror out with
> raise URLError(err)
E urllib.error.URLError: <urlopen error [Errno -3] Temporary failure in name resolution>
Desired Behavior
It would help us alot if those these were using pytest.mark to signal they were requiring network access. That would mean decorating those tests with @pytest.mark.network
Registering custom markers
https://docs.pytest.org/en/6.2.x/mark.html#registering-marks
Using markers
https://docs.pytest.org/en/6.2.x/example/markers.html
Example API
pytest -m "not network"
Additional context
FAILED tests/test_audiofifo.py::TestAudioFifo::test_data - urllib.error.URLEr...
FAILED tests/test_codec_context.py::TestCodecContext::test_codec_tag - urllib...
FAILED tests/test_codec_context.py::TestCodecContext::test_parse - urllib.err...
FAILED tests/test_codec_context.py::TestEncoding::test_encoding_aac - urllib....
FAILED tests/test_codec_context.py::TestEncoding::test_encoding_dnxhd - urlli...
FAILED tests/test_codec_context.py::TestEncoding::test_encoding_dvvideo - url...
FAILED tests/test_codec_context.py::TestEncoding::test_encoding_h264 - urllib...
FAILED tests/test_codec_context.py::TestEncoding::test_encoding_mjpeg - urlli...
FAILED tests/test_codec_context.py::TestEncoding::test_encoding_mp2 - urllib....
FAILED tests/test_codec_context.py::TestEncoding::test_encoding_mpeg1video - ...
FAILED tests/test_codec_context.py::TestEncoding::test_encoding_mpeg4 - urlli...
FAILED tests/test_codec_context.py::TestEncoding::test_encoding_pcm_s24le - u...
FAILED tests/test_codec_context.py::TestEncoding::test_encoding_png - urllib....
FAILED tests/test_codec_context.py::TestEncoding::test_encoding_tiff - urllib...
FAILED tests/test_codec_context.py::TestEncoding::test_encoding_xvid - urllib...
FAILED tests/test_decode.py::TestDecode::test_decode_audio_sample_count - url...
FAILED tests/test_decode.py::TestDecode::test_decoded_motion_vectors - urllib...
FAILED tests/test_decode.py::TestDecode::test_decoded_motion_vectors_no_flag
FAILED tests/test_decode.py::TestDecode::test_decoded_time_base - urllib.erro...
FAILED tests/test_decode.py::TestDecode::test_decoded_video_frame_count - url...
FAILED tests/test_encode.py::TestBasicAudioEncoding::test_transcode - urllib....
FAILED tests/test_file_probing.py::TestAudioProbe::test_container_probing - u...
FAILED tests/test_file_probing.py::TestAudioProbe::test_stream_probing - urll...
FAILED tests/test_file_probing.py::TestDataProbe::test_container_probing - ur...
FAILED tests/test_file_probing.py::TestDataProbe::test_stream_probing - urlli...
FAILED tests/test_file_probing.py::TestSubtitleProbe::test_container_probing
FAILED tests/test_file_probing.py::TestSubtitleProbe::test_stream_probing - u...
FAILED tests/test_file_probing.py::TestVideoProbe::test_container_probing - u...
FAILED tests/test_file_probing.py::TestVideoProbe::test_stream_probing - urll...
FAILED tests/test_python_io.py::TestPythonIO::test_reading_from_buffer - urll...
FAILED tests/test_python_io.py::TestPythonIO::test_reading_from_buffer_no_seek
FAILED tests/test_python_io.py::TestPythonIO::test_reading_from_file - urllib...
FAILED tests/test_python_io.py::TestPythonIO::test_reading_from_pipe_readonly
FAILED tests/test_python_io.py::TestPythonIO::test_reading_from_write_readonly
FAILED tests/test_seek.py::TestSeek::test_decode_half - urllib.error.URLError...
FAILED tests/test_seek.py::TestSeek::test_seek_end - urllib.error.URLError: <...
FAILED tests/test_seek.py::TestSeek::test_seek_float - urllib.error.URLError:...
FAILED tests/test_seek.py::TestSeek::test_seek_int64 - urllib.error.URLError:...
FAILED tests/test_seek.py::TestSeek::test_seek_middle - urllib.error.URLError...
FAILED tests/test_seek.py::TestSeek::test_seek_start - urllib.error.URLError:...
FAILED tests/test_seek.py::TestSeek::test_stream_seek - urllib.error.URLError...
FAILED tests/test_streams.py::TestStreams::test_selection - urllib.error.URLE...
FAILED tests/test_streams.py::TestStreams::test_stream_tuples - urllib.error....
FAILED tests/test_subtitles.py::TestSubtitle::test_movtext - urllib.error.URL...
FAILED tests/test_subtitles.py::TestSubtitle::test_vobsub - urllib.error.URLE...
FAILED tests/test_videoframe.py::TestVideoFrameImage::test_roundtrip - urllib...