def test_fileno_when_ValueError_raised(self):
class FilenoRaisesValueError(UnconditionallyRaise):
def __init__(self):
UnconditionallyRaise.__init__(self, ValueError)
def fileno(self):
self.__call__()
unconditionally_raise_ValueError = FilenoRaisesValueError()
t = writeTmp(1, ["\n"])
self.addCleanup(remove_tempfiles, t)
with FileInput(files=[t]) as fi:
file_backup = fi._file
try:
fi._file = unconditionally_raise_ValueError
result = fi.fileno()
finally:
fi._file = file_backup # make sure the file gets cleaned up
# sanity check to make sure that our test scenario was actually hit
self.assertTrue(unconditionally_raise_ValueError.invoked,
"_file.fileno() was not invoked")
self.assertEqual(result, -1, "fileno() should return -1")
python类fileno()的实例源码
def test_fileno_when_ValueError_raised(self):
class FilenoRaisesValueError(UnconditionallyRaise):
def __init__(self):
UnconditionallyRaise.__init__(self, ValueError)
def fileno(self):
self.__call__()
unconditionally_raise_ValueError = FilenoRaisesValueError()
t = writeTmp(1, ["\n"])
self.addCleanup(remove_tempfiles, t)
with FileInput(files=[t]) as fi:
file_backup = fi._file
try:
fi._file = unconditionally_raise_ValueError
result = fi.fileno()
finally:
fi._file = file_backup # make sure the file gets cleaned up
# sanity check to make sure that our test scenario was actually hit
self.assertTrue(unconditionally_raise_ValueError.invoked,
"_file.fileno() was not invoked")
self.assertEqual(result, -1, "fileno() should return -1")
def test_fileno_when_ValueError_raised(self):
class FilenoRaisesValueError(UnconditionallyRaise):
def __init__(self):
UnconditionallyRaise.__init__(self, ValueError)
def fileno(self):
self.__call__()
unconditionally_raise_ValueError = FilenoRaisesValueError()
t = writeTmp(1, ["\n"])
self.addCleanup(remove_tempfiles, t)
with FileInput(files=[t]) as fi:
file_backup = fi._file
try:
fi._file = unconditionally_raise_ValueError
result = fi.fileno()
finally:
fi._file = file_backup # make sure the file gets cleaned up
# sanity check to make sure that our test scenario was actually hit
self.assertTrue(unconditionally_raise_ValueError.invoked,
"_file.fileno() was not invoked")
self.assertEqual(result, -1, "fileno() should return -1")
def test_fileno(self):
t1 = t2 = None
try:
t1 = writeTmp(1, ["A\nB"])
t2 = writeTmp(2, ["C\nD"])
fi = FileInput(files=(t1, t2))
self.assertEqual(fi.fileno(), -1)
line =next( fi)
self.assertNotEqual(fi.fileno(), -1)
fi.nextfile()
self.assertEqual(fi.fileno(), -1)
line = list(fi)
self.assertEqual(fi.fileno(), -1)
finally:
remove_tempfiles(t1, t2)
def fileno(self):
self.invocation_counts["fileno"] += 1
return self.return_values["fileno"]
def test_state_is_None(self):
"""Tests fileinput.fileno() when fileinput._state is None.
Ensure that it raises RuntimeError with a meaningful error message
and does not modify fileinput._state"""
fileinput._state = None
with self.assertRaises(RuntimeError) as cm:
fileinput.fileno()
self.assertEqual(("no active input()",), cm.exception.args)
self.assertIsNone(fileinput._state)
def test_state_is_not_None(self):
"""Tests fileinput.fileno() when fileinput._state is not None.
Ensure that it invokes fileinput._state.fileno() exactly once,
returns whatever it returns, and does not modify fileinput._state
to point to a different object."""
fileno_retval = object()
instance = MockFileInput()
instance.return_values["fileno"] = fileno_retval
instance.fileno_retval = fileno_retval
fileinput._state = instance
retval = fileinput.fileno()
self.assertExactlyOneInvocation(instance, "fileno")
self.assertIs(retval, fileno_retval)
self.assertIs(fileinput._state, instance)
def test_fileno(self):
t1 = t2 = None
try:
t1 = writeTmp(1, ["A\nB"])
t2 = writeTmp(2, ["C\nD"])
fi = FileInput(files=(t1, t2))
self.assertEqual(fi.fileno(), -1)
line =next( fi)
self.assertNotEqual(fi.fileno(), -1)
fi.nextfile()
self.assertEqual(fi.fileno(), -1)
line = list(fi)
self.assertEqual(fi.fileno(), -1)
finally:
remove_tempfiles(t1, t2)
def fileno(self):
self.invocation_counts["fileno"] += 1
return self.return_values["fileno"]
def test_state_is_None(self):
"""Tests fileinput.fileno() when fileinput._state is None.
Ensure that it raises RuntimeError with a meaningful error message
and does not modify fileinput._state"""
fileinput._state = None
with self.assertRaises(RuntimeError) as cm:
fileinput.fileno()
self.assertEqual(("no active input()",), cm.exception.args)
self.assertIsNone(fileinput._state)
def test_state_is_not_None(self):
"""Tests fileinput.fileno() when fileinput._state is not None.
Ensure that it invokes fileinput._state.fileno() exactly once,
returns whatever it returns, and does not modify fileinput._state
to point to a different object."""
fileno_retval = object()
instance = MockFileInput()
instance.return_values["fileno"] = fileno_retval
instance.fileno_retval = fileno_retval
fileinput._state = instance
retval = fileinput.fileno()
self.assertExactlyOneInvocation(instance, "fileno")
self.assertIs(retval, fileno_retval)
self.assertIs(fileinput._state, instance)
def test_fileno(self):
t1 = t2 = None
try:
t1 = writeTmp(1, ["A\nB"])
t2 = writeTmp(2, ["C\nD"])
fi = FileInput(files=(t1, t2))
self.assertEqual(fi.fileno(), -1)
line =next( fi)
self.assertNotEqual(fi.fileno(), -1)
fi.nextfile()
self.assertEqual(fi.fileno(), -1)
line = list(fi)
self.assertEqual(fi.fileno(), -1)
finally:
remove_tempfiles(t1, t2)
def fileno(self):
self.invocation_counts["fileno"] += 1
return self.return_values["fileno"]
def test_state_is_None(self):
"""Tests fileinput.fileno() when fileinput._state is None.
Ensure that it raises RuntimeError with a meaningful error message
and does not modify fileinput._state"""
fileinput._state = None
with self.assertRaises(RuntimeError) as cm:
fileinput.fileno()
self.assertEqual(("no active input()",), cm.exception.args)
self.assertIsNone(fileinput._state)
def test_state_is_not_None(self):
"""Tests fileinput.fileno() when fileinput._state is not None.
Ensure that it invokes fileinput._state.fileno() exactly once,
returns whatever it returns, and does not modify fileinput._state
to point to a different object."""
fileno_retval = object()
instance = MockFileInput()
instance.return_values["fileno"] = fileno_retval
instance.fileno_retval = fileno_retval
fileinput._state = instance
retval = fileinput.fileno()
self.assertExactlyOneInvocation(instance, "fileno")
self.assertIs(retval, fileno_retval)
self.assertIs(fileinput._state, instance)
