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add test case when to_csv argument is sys.stdout #21572

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Merged
merged 7 commits into from
Jun 22, 2018
Merged

add test case when to_csv argument is sys.stdout #21572

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ab04bc9
add test case when to_csv argument is sys.stdout
r00ta Jun 21, 2018
96634c1
fix PEP8 issue comparison with False
r00ta Jun 21, 2018
49b486a
add to_csv test when argument is sys.stdout using the decorator captu…
r00ta Jun 21, 2018
59f5919
remove unused import
r00ta Jun 22, 2018
d61d792
fix lint error - line too long
r00ta Jun 22, 2018
557fa9f
remove useless double import of testing module
r00ta Jun 22, 2018
b250259
fix according to PEP-8 standard
r00ta Jun 22, 2018
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15 changes: 15 additions & 0 deletions pandas/tests/io/formats/test_to_csv.py
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Original file line number Diff line number Diff line change
Expand Up @@ -285,3 +285,18 @@ def test_to_csv_string_array_utf8(self):
df.to_csv(path, encoding='utf-8')
with open(path, 'r') as f:
assert f.read() == expected_utf8

@tm.capture_stdout
def test_to_csv_stdout_file(self):
# GH 21561
df = pd.DataFrame([['foo', 'bar'], ['baz', 'qux']],
columns=['name_1', 'name_2'])
expected_ascii = '''\
,name_1,name_2
0,foo,bar
1,baz,qux
'''
df.to_csv(sys.stdout, encoding='ascii')
output = sys.stdout.getvalue()
assert output == expected_ascii
assert not sys.stdout.closed