def test_real_fh_nosetests():
# sys.stdout and sys.stderr have been monkey-patched by nosetests
# with a custom class (not io.StringIO!)
with sh.real_fh(sys.stdout) as rfh:
assert rfh is not sys.stdout
assert rfh.fileno() > 2
rfh.write("Hello world")
with sh.real_fh(sys.stderr) as rfh:
assert rfh is not sys.stderr
assert rfh.fileno() > 2
rfh.write("Hello world")
def test_real_fh_fullpipe():
# Exceed the typical size of a pipe (64 kbytes on Linux)
# in an attempt to trigger a deadlock if the pipe isn't
# continuously flushed.
fh = io.StringIO()
payload = "x" * int(2**20) # 1MB payload
with sh.real_fh(fh) as rfh:
rfh.write(payload)
assert fh.getvalue() == payload
def test_real_fh_crash():
# Test that the output copy is wrapped by a `finally` clause,
# so that it is not lost if the wrapped code raises an Exception
fh = io.StringIO()
with pytest.raises(StubError):
with sh.real_fh(fh) as rfh:
rfh.write("Hello world")
raise StubError()
assert fh.getvalue() == "Hello world"
def test_real_fh_crash():
# Test that the output copy is wrapped by a `finally` clause,
# so that it is not lost if the wrapped code raises an Exception
fh = io.StringIO()
try:
with sh.real_fh(fh) as rfh:
rfh.write("Hello world")
raise StubError()
except StubError:
pass
else:
# Exception isn't masked
assert False
assert fh.getvalue() == "Hello world"
def test_real_fh_bytesio():
fh = io.BytesIO()
with sh.real_fh(fh) as rfh:
assert rfh.fileno() > 2
rfh.write(b"Hello world")
assert fh.getvalue() == b"Hello world"
def test_real_fh_stringio():
fh = io.StringIO()
with sh.real_fh(fh) as rfh:
assert rfh.fileno() > 2
rfh.write("Hello world")
assert fh.getvalue() == "Hello world"
def test_real_fh_trivial():
# Real POSIX-backed file handle
with tempfile.TemporaryFile() as fh:
with sh.real_fh(fh) as rfh:
assert rfh is fh
def test_real_fh_none():
# Required by call, check_call, check_output
with sh.real_fh(None) as rfh:
assert rfh is None