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TST: Clean up json/test_compression.py #19331

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Jan 21, 2018
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TST: Clean up json/test_compression.py #19331

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36 changes: 3 additions & 33 deletions pandas/tests/io/json/test_compression.py
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Original file line number Diff line number Diff line change
@@ -1,38 +1,10 @@
import pytest

import pandas as pd
from pandas import compat
import pandas.util.testing as tm
import pandas.util._test_decorators as td
from pandas.util.testing import assert_frame_equal, assert_raises_regex


COMPRESSION_TYPES = [None, 'bz2', 'gzip',
pytest.param('xz', marks=td.skip_if_no_lzma)]


def decompress_file(path, compression):
if compression is None:
f = open(path, 'rb')
elif compression == 'gzip':
import gzip
f = gzip.GzipFile(path, 'rb')
elif compression == 'bz2':
import bz2
f = bz2.BZ2File(path, 'rb')
elif compression == 'xz':
lzma = compat.import_lzma()
f = lzma.open(path, 'rb')
else:
msg = 'Unrecognized compression type: {}'.format(compression)
raise ValueError(msg)

result = f.read().decode('utf8')
f.close()
return result


@pytest.mark.parametrize('compression', COMPRESSION_TYPES)
def test_compression_roundtrip(compression):
df = pd.DataFrame([[0.123456, 0.234567, 0.567567],
[12.32112, 123123.2, 321321.2]],
Expand All @@ -43,8 +15,9 @@ def test_compression_roundtrip(compression):
assert_frame_equal(df, pd.read_json(path, compression=compression))

# explicitly ensure file was compressed.
uncompressed_content = decompress_file(path, compression)
assert_frame_equal(df, pd.read_json(uncompressed_content))
with tm.decompress_file(path, compression) as fh:
result = fh.read().decode('utf8')
assert_frame_equal(df, pd.read_json(result))


def test_compress_zip_value_error():
Expand All @@ -67,7 +40,6 @@ def test_read_zipped_json():
assert_frame_equal(uncompressed_df, compressed_df)


@pytest.mark.parametrize('compression', COMPRESSION_TYPES)
def test_with_s3_url(compression):
boto3 = pytest.importorskip('boto3')
pytest.importorskip('s3fs')
Expand All @@ -88,7 +60,6 @@ def test_with_s3_url(compression):
assert_frame_equal(df, roundtripped_df)


@pytest.mark.parametrize('compression', COMPRESSION_TYPES)
def test_lines_with_compression(compression):
with tm.ensure_clean() as path:
df = pd.read_json('{"a": [1, 2, 3], "b": [4, 5, 6]}')
Expand All @@ -98,7 +69,6 @@ def test_lines_with_compression(compression):
assert_frame_equal(df, roundtripped_df)


@pytest.mark.parametrize('compression', COMPRESSION_TYPES)
def test_chunksize_with_compression(compression):
with tm.ensure_clean() as path:
df = pd.read_json('{"a": ["foo", "bar", "baz"], "b": [4, 5, 6]}')
Expand Down