Skip tests only for lz4/zstd params if not installed
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2022-07-18T15:49:23Z
https://github.com/huggingface/datasets/pull/4704#issuecomment-1187666790
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2022-07-19T13:02:31Z
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Currently, if `zstandard` or `lz4` are not installed, `test_compression_filesystems` and `test_streaming_dl_manager_extract_all_supported_single_file_compression_types` are skipped for all compression format parameters.

This PR fixes these tests, so that if `zstandard` or `lz4` are not installed, the tests are skipped only for the corresponding compression parameters (`zstd` or `lz4`), whereas the tests are not skipped for all the other compression parameters (`gzip`, `xz` and `bz2`).

Related to:
- #4688