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# Copyright (c) Twisted Matrix Laboratories.
# See LICENSE for details.
"""
Tests for L{twisted.application.runner._exit}.
"""
from io import StringIO
from typing import Optional, Union
import twisted.trial.unittest
from ...runner import _exit
from .._exit import ExitStatus, exit
class ExitTests(twisted.trial.unittest.TestCase):
"""
Tests for L{exit}.
"""
def setUp(self) -> None:
self.exit = DummyExit()
self.patch(_exit, "sysexit", self.exit)
def test_exitStatusInt(self) -> None:
"""
L{exit} given an L{int} status code will pass it to L{sys.exit}.
"""
status = 1234
exit(status)
self.assertEqual(self.exit.arg, status) # type: ignore[unreachable]
def test_exitConstant(self) -> None:
"""
L{exit} given a L{ValueConstant} status code passes the corresponding
value to L{sys.exit}.
"""
status = ExitStatus.EX_CONFIG
exit(status)
self.assertEqual(self.exit.arg, status.value) # type: ignore[unreachable]
def test_exitMessageZero(self) -> None:
"""
L{exit} given a status code of zero (C{0}) writes the given message to
standard output.
"""
out = StringIO()
self.patch(_exit, "stdout", out)
message = "Hello, world."
exit(0, message)
self.assertEqual(out.getvalue(), message + "\n") # type: ignore[unreachable]
def test_exitMessageNonZero(self) -> None:
"""
L{exit} given a non-zero status code writes the given message to
standard error.
"""
out = StringIO()
self.patch(_exit, "stderr", out)
message = "Hello, world."
exit(64, message)
self.assertEqual(out.getvalue(), message + "\n") # type: ignore[unreachable]
class DummyExit:
"""
Stub for L{sys.exit} that remembers whether it's been called and, if it
has, what argument it was given.
"""
def __init__(self) -> None:
self.exited = False
def __call__(self, arg: Optional[Union[int, str]] = None) -> None:
assert not self.exited
self.arg = arg
self.exited = True