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[2.7] bpo-28286: Add tests for the mode argument of GzipFile. (GH-4074). (#4077) 

(cherry picked from commit bcbdd2f8db)
This commit is contained in:
Serhiy Storchaka 2017-10-22 14:54:05 +03:00 committed by GitHub
parent 4dc05c34ac
commit f7d19b0464
1 changed files with 20 additions and 0 deletions
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20
Lib/test/test_gzip.py
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@ -331,6 +331,26 @@ class TestGzip(unittest.TestCase):
with gzip.GzipFile(fileobj=f, mode="w") as g:
self.assertEqual(g.name, "")
def test_fileobj_mode(self):
gzip.GzipFile(self.filename, "wb").close()
with open(self.filename, "r+b") as f:
with gzip.GzipFile(fileobj=f, mode='r') as g:
self.assertEqual(g.mode, gzip.READ)
with gzip.GzipFile(fileobj=f, mode='w') as g:
self.assertEqual(g.mode, gzip.WRITE)
with gzip.GzipFile(fileobj=f, mode='a') as g:
self.assertEqual(g.mode, gzip.WRITE)
with self.assertRaises(IOError):
gzip.GzipFile(fileobj=f, mode='z')
for mode in "rb", "r+b":
with open(self.filename, mode) as f:
with gzip.GzipFile(fileobj=f) as g:
self.assertEqual(g.mode, gzip.READ)
for mode in "wb", "ab":
with open(self.filename, mode) as f:
with gzip.GzipFile(fileobj=f) as g:
self.assertEqual(g.mode, gzip.WRITE)
def test_read_with_extra(self):
# Gzip data with an extra field
gzdata = (b'\x1f\x8b\x08\x04\xb2\x17cQ\x02\xff'