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import contextlib
import json
import os
import os.path
import sys
import threading
from textwrap import dedent
import unittest
import time
from test import support
from test.support import import_helper
from test.support import threading_helper
from test.support import os_helper
_interpreters = import_helper.import_module('_xxsubinterpreters')
_channels = import_helper.import_module('_xxinterpchannels')
from test.support import interpreters
def _captured_script(script):
r, w = os.pipe()
indented = script.replace('\n', '\n ')
wrapped = dedent(f"""
import contextlib
with open({w}, 'w', encoding='utf-8') as spipe:
with contextlib.redirect_stdout(spipe):
{indented}
""")
return wrapped, open(r, encoding='utf-8')
def clean_up_interpreters():
for interp in interpreters.list_all():
if interp.id == 0: # main
continue
try:
interp.close()
except RuntimeError:
pass # already destroyed
def _run_output(interp, request, channels=None):
script, rpipe = _captured_script(request)
with rpipe:
interp.run(script, channels=channels)
return rpipe.read()
@contextlib.contextmanager
def _running(interp):
r, w = os.pipe()
def run():
interp.run(dedent(f"""
# wait for "signal"
with open({r}) as rpipe:
rpipe.read()
"""))
t = threading.Thread(target=run)
t.start()
yield
with open(w, 'w') as spipe:
spipe.write('done')
t.join()
class TestBase(unittest.TestCase):
def os_pipe(self):
r, w = os.pipe()
def cleanup():
try:
os.close(w)
except Exception:
pass
try:
os.close(r)
except Exception:
pass
self.addCleanup(cleanup)
return r, w
def tearDown(self):
clean_up_interpreters()
class CreateTests(TestBase):
def test_in_main(self):
interp = interpreters.create()
self.assertIsInstance(interp, interpreters.Interpreter)
self.assertIn(interp, interpreters.list_all())
def test_in_thread(self):
lock = threading.Lock()
interp = None
def f():
nonlocal interp
interp = interpreters.create()
lock.acquire()
lock.release()
t = threading.Thread(target=f)
with lock:
t.start()
t.join()
self.assertIn(interp, interpreters.list_all())
def test_in_subinterpreter(self):
main, = interpreters.list_all()
interp = interpreters.create()
out = _run_output(interp, dedent("""
from test.support import interpreters
interp = interpreters.create()
print(interp.id)
"""))
interp2 = interpreters.Interpreter(int(out))
self.assertEqual(interpreters.list_all(), [main, interp, interp2])
def test_after_destroy_all(self):
before = set(interpreters.list_all())
# Create 3 subinterpreters.
interp_lst = []
for _ in range(3):
interps = interpreters.create()
interp_lst.append(interps)
# Now destroy them.
for interp in interp_lst:
interp.close()
# Finally, create another.
interp = interpreters.create()
self.assertEqual(set(interpreters.list_all()), before | {interp})
def test_after_destroy_some(self):
before = set(interpreters.list_all())
# Create 3 subinterpreters.
interp1 = interpreters.create()
interp2 = interpreters.create()
interp3 = interpreters.create()
# Now destroy 2 of them.
interp1.close()
interp2.close()
# Finally, create another.
interp = interpreters.create()
self.assertEqual(set(interpreters.list_all()), before | {interp3, interp})
class GetCurrentTests(TestBase):
def test_main(self):
main = interpreters.get_main()
current = interpreters.get_current()
self.assertEqual(current, main)
def test_subinterpreter(self):
main = _interpreters.get_main()
interp = interpreters.create()
out = _run_output(interp, dedent("""
from test.support import interpreters
cur = interpreters.get_current()
print(cur.id)
"""))
current = interpreters.Interpreter(int(out))
self.assertNotEqual(current, main)
class ListAllTests(TestBase):
def test_initial(self):
interps = interpreters.list_all()
self.assertEqual(1, len(interps))
def test_after_creating(self):
main = interpreters.get_current()
first = interpreters.create()
second = interpreters.create()
ids = []
for interp in interpreters.list_all():
ids.append(interp.id)
self.assertEqual(ids, [main.id, first.id, second.id])
def test_after_destroying(self):
main = interpreters.get_current()
first = interpreters.create()
second = interpreters.create()
first.close()
ids = []
for interp in interpreters.list_all():
ids.append(interp.id)
self.assertEqual(ids, [main.id, second.id])
class TestInterpreterAttrs(TestBase):
def test_id_type(self):
main = interpreters.get_main()
current = interpreters.get_current()
interp = interpreters.create()
self.assertIsInstance(main.id, _interpreters.InterpreterID)
self.assertIsInstance(current.id, _interpreters.InterpreterID)
self.assertIsInstance(interp.id, _interpreters.InterpreterID)
def test_main_id(self):
main = interpreters.get_main()
self.assertEqual(main.id, 0)
def test_custom_id(self):
interp = interpreters.Interpreter(1)
self.assertEqual(interp.id, 1)
with self.assertRaises(TypeError):
interpreters.Interpreter('1')
def test_id_readonly(self):
interp = interpreters.Interpreter(1)
with self.assertRaises(AttributeError):
interp.id = 2
@unittest.skip('not ready yet (see bpo-32604)')
def test_main_isolated(self):
main = interpreters.get_main()
self.assertFalse(main.isolated)
@unittest.skip('not ready yet (see bpo-32604)')
def test_subinterpreter_isolated_default(self):
interp = interpreters.create()
self.assertFalse(interp.isolated)
def test_subinterpreter_isolated_explicit(self):
interp1 = interpreters.create(isolated=True)
interp2 = interpreters.create(isolated=False)
self.assertTrue(interp1.isolated)
self.assertFalse(interp2.isolated)
@unittest.skip('not ready yet (see bpo-32604)')
def test_custom_isolated_default(self):
interp = interpreters.Interpreter(1)
self.assertFalse(interp.isolated)
def test_custom_isolated_explicit(self):
interp1 = interpreters.Interpreter(1, isolated=True)
interp2 = interpreters.Interpreter(1, isolated=False)
self.assertTrue(interp1.isolated)
self.assertFalse(interp2.isolated)
def test_isolated_readonly(self):
interp = interpreters.Interpreter(1)
with self.assertRaises(AttributeError):
interp.isolated = True
def test_equality(self):
interp1 = interpreters.create()
interp2 = interpreters.create()
self.assertEqual(interp1, interp1)
self.assertNotEqual(interp1, interp2)
class TestInterpreterIsRunning(TestBase):
def test_main(self):
main = interpreters.get_main()
self.assertTrue(main.is_running())
@unittest.skip('Fails on FreeBSD')
def test_subinterpreter(self):
interp = interpreters.create()
self.assertFalse(interp.is_running())
with _running(interp):
self.assertTrue(interp.is_running())
self.assertFalse(interp.is_running())
def test_finished(self):
r, w = self.os_pipe()
interp = interpreters.create()
interp.run(f"""if True:
import os
os.write({w}, b'x')
""")
self.assertFalse(interp.is_running())
self.assertEqual(os.read(r, 1), b'x')
def test_from_subinterpreter(self):
interp = interpreters.create()
out = _run_output(interp, dedent(f"""
import _xxsubinterpreters as _interpreters
if _interpreters.is_running({interp.id}):
print(True)
else:
print(False)
"""))
self.assertEqual(out.strip(), 'True')
def test_already_destroyed(self):
interp = interpreters.create()
interp.close()
with self.assertRaises(RuntimeError):
interp.is_running()
def test_does_not_exist(self):
interp = interpreters.Interpreter(1_000_000)
with self.assertRaises(RuntimeError):
interp.is_running()
def test_bad_id(self):
interp = interpreters.Interpreter(-1)
with self.assertRaises(ValueError):
interp.is_running()
def test_with_only_background_threads(self):
r_interp, w_interp = self.os_pipe()
r_thread, w_thread = self.os_pipe()
DONE = b'D'
FINISHED = b'F'
interp = interpreters.create()
interp.run(f"""if True:
import os
import threading
def task():
v = os.read({r_thread}, 1)
assert v == {DONE!r}
os.write({w_interp}, {FINISHED!r})
t = threading.Thread(target=task)
t.start()
""")
self.assertFalse(interp.is_running())
os.write(w_thread, DONE)
interp.run('t.join()')
self.assertEqual(os.read(r_interp, 1), FINISHED)
class TestInterpreterClose(TestBase):
def test_basic(self):
main = interpreters.get_main()
interp1 = interpreters.create()
interp2 = interpreters.create()
interp3 = interpreters.create()
self.assertEqual(set(interpreters.list_all()),
{main, interp1, interp2, interp3})
interp2.close()
self.assertEqual(set(interpreters.list_all()),
{main, interp1, interp3})
def test_all(self):
before = set(interpreters.list_all())
interps = set()
for _ in range(3):
interp = interpreters.create()
interps.add(interp)
self.assertEqual(set(interpreters.list_all()), before | interps)
for interp in interps:
interp.close()
self.assertEqual(set(interpreters.list_all()), before)
def test_main(self):
main, = interpreters.list_all()
with self.assertRaises(RuntimeError):
main.close()
def f():
with self.assertRaises(RuntimeError):
main.close()
t = threading.Thread(target=f)
t.start()
t.join()
def test_already_destroyed(self):
interp = interpreters.create()
interp.close()
with self.assertRaises(RuntimeError):
interp.close()
def test_does_not_exist(self):
interp = interpreters.Interpreter(1_000_000)
with self.assertRaises(RuntimeError):
interp.close()
def test_bad_id(self):
interp = interpreters.Interpreter(-1)
with self.assertRaises(ValueError):
interp.close()
def test_from_current(self):
main, = interpreters.list_all()
interp = interpreters.create()
out = _run_output(interp, dedent(f"""
from test.support import interpreters
interp = interpreters.Interpreter({int(interp.id)})
try:
interp.close()
except RuntimeError:
print('failed')
"""))
self.assertEqual(out.strip(), 'failed')
self.assertEqual(set(interpreters.list_all()), {main, interp})
def test_from_sibling(self):
main, = interpreters.list_all()
interp1 = interpreters.create()
interp2 = interpreters.create()
self.assertEqual(set(interpreters.list_all()),
{main, interp1, interp2})
interp1.run(dedent(f"""
from test.support import interpreters
interp2 = interpreters.Interpreter(int({interp2.id}))
interp2.close()
interp3 = interpreters.create()
interp3.close()
"""))
self.assertEqual(set(interpreters.list_all()), {main, interp1})
def test_from_other_thread(self):
interp = interpreters.create()
def f():
interp.close()
t = threading.Thread(target=f)
t.start()
t.join()
@unittest.skip('Fails on FreeBSD')
def test_still_running(self):
main, = interpreters.list_all()
interp = interpreters.create()
with _running(interp):
with self.assertRaises(RuntimeError):
interp.close()
self.assertTrue(interp.is_running())
def test_subthreads_still_running(self):
r_interp, w_interp = self.os_pipe()
r_thread, w_thread = self.os_pipe()
FINISHED = b'F'
interp = interpreters.create()
interp.run(f"""if True:
import os
import threading
import time
done = False
def notify_fini():
global done
done = True
t.join()
threading._register_atexit(notify_fini)
def task():
while not done:
time.sleep(0.1)
os.write({w_interp}, {FINISHED!r})
t = threading.Thread(target=task)
t.start()
""")
interp.close()
self.assertEqual(os.read(r_interp, 1), FINISHED)
class TestInterpreterRun(TestBase):
def test_success(self):
interp = interpreters.create()
script, file = _captured_script('print("it worked!", end="")')
with file:
interp.run(script)
out = file.read()
self.assertEqual(out, 'it worked!')
def test_in_thread(self):
interp = interpreters.create()
script, file = _captured_script('print("it worked!", end="")')
with file:
def f():
interp.run(script)
t = threading.Thread(target=f)
t.start()
t.join()
out = file.read()
self.assertEqual(out, 'it worked!')
@support.requires_fork()
def test_fork(self):
interp = interpreters.create()
import tempfile
with tempfile.NamedTemporaryFile('w+', encoding='utf-8') as file:
file.write('')
file.flush()
expected = 'spam spam spam spam spam'
script = dedent(f"""
import os
try:
os.fork()
except RuntimeError:
with open('{file.name}', 'w', encoding='utf-8') as out:
out.write('{expected}')
""")
interp.run(script)
file.seek(0)
content = file.read()
self.assertEqual(content, expected)
@unittest.skip('Fails on FreeBSD')
def test_already_running(self):
interp = interpreters.create()
with _running(interp):
with self.assertRaises(RuntimeError):
interp.run('print("spam")')
def test_does_not_exist(self):
interp = interpreters.Interpreter(1_000_000)
with self.assertRaises(RuntimeError):
interp.run('print("spam")')
def test_bad_id(self):
interp = interpreters.Interpreter(-1)
with self.assertRaises(ValueError):
interp.run('print("spam")')
def test_bad_script(self):
interp = interpreters.create()
with self.assertRaises(TypeError):
interp.run(10)
def test_bytes_for_script(self):
interp = interpreters.create()
with self.assertRaises(TypeError):
interp.run(b'print("spam")')
def test_with_background_threads_still_running(self):
r_interp, w_interp = self.os_pipe()
r_thread, w_thread = self.os_pipe()
RAN = b'R'
DONE = b'D'
FINISHED = b'F'
interp = interpreters.create()
interp.run(f"""if True:
import os
import threading
def task():
v = os.read({r_thread}, 1)
assert v == {DONE!r}
os.write({w_interp}, {FINISHED!r})
t = threading.Thread(target=task)
t.start()
os.write({w_interp}, {RAN!r})
""")
interp.run(f"""if True:
os.write({w_interp}, {RAN!r})
""")
os.write(w_thread, DONE)
interp.run('t.join()')
self.assertEqual(os.read(r_interp, 1), RAN)
self.assertEqual(os.read(r_interp, 1), RAN)
self.assertEqual(os.read(r_interp, 1), FINISHED)
# test_xxsubinterpreters covers the remaining Interpreter.run() behavior.
@unittest.skip('these are crashing, likely just due just to _xxsubinterpreters (see gh-105699)')
class StressTests(TestBase):
# In these tests we generally want a lot of interpreters,
# but not so many that any test takes too long.
@support.requires_resource('cpu')
def test_create_many_sequential(self):
alive = []
for _ in range(100):
interp = interpreters.create()
alive.append(interp)
@support.requires_resource('cpu')
def test_create_many_threaded(self):
alive = []
def task():
interp = interpreters.create()
alive.append(interp)
threads = (threading.Thread(target=task) for _ in range(200))
with threading_helper.start_threads(threads):
pass
class StartupTests(TestBase):
# We want to ensure the initial state of subinterpreters
# matches expectations.
_subtest_count = 0
@contextlib.contextmanager
def subTest(self, *args):
with super().subTest(*args) as ctx:
self._subtest_count += 1
try:
yield ctx
finally:
if self._debugged_in_subtest:
if self._subtest_count == 1:
# The first subtest adds a leading newline, so we
# compensate here by not printing a trailing newline.
print('### end subtest debug ###', end='')
else:
print('### end subtest debug ###')
self._debugged_in_subtest = False
def debug(self, msg, *, header=None):
if header:
self._debug(f'--- {header} ---')
if msg:
if msg.endswith(os.linesep):
self._debug(msg[:-len(os.linesep)])
else:
self._debug(msg)
self._debug('<no newline>')
self._debug('------')
else:
self._debug(msg)
_debugged = False
_debugged_in_subtest = False
def _debug(self, msg):
if not self._debugged:
print()
self._debugged = True
if self._subtest is not None:
if True:
if not self._debugged_in_subtest:
self._debugged_in_subtest = True
print('### start subtest debug ###')
print(msg)
else:
print(msg)
def create_temp_dir(self):
import tempfile
tmp = tempfile.mkdtemp(prefix='test_interpreters_')
tmp = os.path.realpath(tmp)
self.addCleanup(os_helper.rmtree, tmp)
return tmp
def write_script(self, *path, text):
filename = os.path.join(*path)
dirname = os.path.dirname(filename)
if dirname:
os.makedirs(dirname, exist_ok=True)
with open(filename, 'w', encoding='utf-8') as outfile:
outfile.write(dedent(text))
return filename
@support.requires_subprocess()
def run_python(self, argv, *, cwd=None):
# This method is inspired by
# EmbeddingTestsMixin.run_embedded_interpreter() in test_embed.py.
import shlex
import subprocess
if isinstance(argv, str):
argv = shlex.split(argv)
argv = [sys.executable, *argv]
try:
proc = subprocess.run(
argv,
cwd=cwd,
capture_output=True,
text=True,
)
except Exception as exc:
self.debug(f'# cmd: {shlex.join(argv)}')
if isinstance(exc, FileNotFoundError) and not exc.filename:
if os.path.exists(argv[0]):
exists = 'exists'
else:
exists = 'does not exist'
self.debug(f'{argv[0]} {exists}')
raise # re-raise
assert proc.stderr == '' or proc.returncode != 0, proc.stderr
if proc.returncode != 0 and support.verbose:
self.debug(f'# python3 {shlex.join(argv[1:])} failed:')
self.debug(proc.stdout, header='stdout')
self.debug(proc.stderr, header='stderr')
self.assertEqual(proc.returncode, 0)
self.assertEqual(proc.stderr, '')
return proc.stdout
def test_sys_path_0(self):
# The main interpreter's sys.path[0] should be used by subinterpreters.
script = '''
import sys
from test.support import interpreters
orig = sys.path[0]
interp = interpreters.create()
interp.run(f"""if True:
import json
import sys
print(json.dumps({{
'main': {orig!r},
'sub': sys.path[0],
}}, indent=4), flush=True)
""")
'''
# <tmp>/
# pkg/
# __init__.py
# __main__.py
# script.py
# script.py
cwd = self.create_temp_dir()
self.write_script(cwd, 'pkg', '__init__.py', text='')
self.write_script(cwd, 'pkg', '__main__.py', text=script)
self.write_script(cwd, 'pkg', 'script.py', text=script)
self.write_script(cwd, 'script.py', text=script)
cases = [
('script.py', cwd),
('-m script', cwd),
('-m pkg', cwd),
('-m pkg.script', cwd),
('-c "import script"', ''),
]
for argv, expected in cases:
with self.subTest(f'python3 {argv}'):
out = self.run_python(argv, cwd=cwd)
data = json.loads(out)
sp0_main, sp0_sub = data['main'], data['sub']
self.assertEqual(sp0_sub, sp0_main)
self.assertEqual(sp0_sub, expected)
class FinalizationTests(TestBase):
def test_gh_109793(self):
import subprocess
argv = [sys.executable, '-c', '''if True:
import _xxsubinterpreters as _interpreters
interpid = _interpreters.create()
raise Exception
''']
proc = subprocess.run(argv, capture_output=True, text=True)
self.assertIn('Traceback', proc.stderr)
if proc.returncode == 0 and support.verbose:
print()
print("--- cmd unexpected succeeded ---")
print(f"stdout:\n{proc.stdout}")
print(f"stderr:\n{proc.stderr}")
print("------")
self.assertEqual(proc.returncode, 1)
class TestIsShareable(TestBase):
def test_default_shareables(self):
shareables = [
# singletons
None,
# builtin objects
b'spam',
'spam',
10,
-10,
]
for obj in shareables:
with self.subTest(obj):
shareable = interpreters.is_shareable(obj)
self.assertTrue(shareable)
def test_not_shareable(self):
class Cheese:
def __init__(self, name):
self.name = name
def __str__(self):
return self.name
class SubBytes(bytes):
"""A subclass of a shareable type."""
not_shareables = [
# singletons
True,
False,
NotImplemented,
...,
# builtin types and objects
type,
object,
object(),
Exception(),
100.0,
# user-defined types and objects
Cheese,
Cheese('Wensleydale'),
SubBytes(b'spam'),
]
for obj in not_shareables:
with self.subTest(repr(obj)):
self.assertFalse(
interpreters.is_shareable(obj))
class TestChannels(TestBase):
def test_create(self):
r, s = interpreters.create_channel()
self.assertIsInstance(r, interpreters.RecvChannel)
self.assertIsInstance(s, interpreters.SendChannel)
def test_list_all(self):
self.assertEqual(interpreters.list_all_channels(), [])
created = set()
for _ in range(3):
ch = interpreters.create_channel()
created.add(ch)
after = set(interpreters.list_all_channels())
self.assertEqual(after, created)
class TestRecvChannelAttrs(TestBase):
def test_id_type(self):
rch, _ = interpreters.create_channel()
self.assertIsInstance(rch.id, _channels.ChannelID)
def test_custom_id(self):
rch = interpreters.RecvChannel(1)
self.assertEqual(rch.id, 1)
with self.assertRaises(TypeError):
interpreters.RecvChannel('1')
def test_id_readonly(self):
rch = interpreters.RecvChannel(1)
with self.assertRaises(AttributeError):
rch.id = 2
def test_equality(self):
ch1, _ = interpreters.create_channel()
ch2, _ = interpreters.create_channel()
self.assertEqual(ch1, ch1)
self.assertNotEqual(ch1, ch2)
class TestSendChannelAttrs(TestBase):
def test_id_type(self):
_, sch = interpreters.create_channel()
self.assertIsInstance(sch.id, _channels.ChannelID)
def test_custom_id(self):
sch = interpreters.SendChannel(1)
self.assertEqual(sch.id, 1)
with self.assertRaises(TypeError):
interpreters.SendChannel('1')
def test_id_readonly(self):
sch = interpreters.SendChannel(1)
with self.assertRaises(AttributeError):
sch.id = 2
def test_equality(self):
_, ch1 = interpreters.create_channel()
_, ch2 = interpreters.create_channel()
self.assertEqual(ch1, ch1)
self.assertNotEqual(ch1, ch2)
class TestSendRecv(TestBase):
def test_send_recv_main(self):
r, s = interpreters.create_channel()
orig = b'spam'
s.send_nowait(orig)
obj = r.recv()
self.assertEqual(obj, orig)
self.assertIsNot(obj, orig)
def test_send_recv_same_interpreter(self):
interp = interpreters.create()
interp.run(dedent("""
from test.support import interpreters
r, s = interpreters.create_channel()
orig = b'spam'
s.send_nowait(orig)
obj = r.recv()
assert obj == orig, 'expected: obj == orig'
assert obj is not orig, 'expected: obj is not orig'
"""))
@unittest.skip('broken (see BPO-...)')
def test_send_recv_different_interpreters(self):
r1, s1 = interpreters.create_channel()
r2, s2 = interpreters.create_channel()
orig1 = b'spam'
s1.send_nowait(orig1)
out = _run_output(
interpreters.create(),
dedent(f"""
obj1 = r.recv()
assert obj1 == b'spam', 'expected: obj1 == orig1'
# When going to another interpreter we get a copy.
assert id(obj1) != {id(orig1)}, 'expected: obj1 is not orig1'
orig2 = b'eggs'
print(id(orig2))
s.send_nowait(orig2)
"""),
channels=dict(r=r1, s=s2),
)
obj2 = r2.recv()
self.assertEqual(obj2, b'eggs')
self.assertNotEqual(id(obj2), int(out))
def test_send_recv_different_threads(self):
r, s = interpreters.create_channel()
def f():
while True:
try:
obj = r.recv()
break
except interpreters.ChannelEmptyError:
time.sleep(0.1)
s.send(obj)
t = threading.Thread(target=f)
t.start()
orig = b'spam'
s.send(orig)
t.join()
obj = r.recv()
self.assertEqual(obj, orig)
self.assertIsNot(obj, orig)
def test_send_recv_nowait_main(self):
r, s = interpreters.create_channel()
orig = b'spam'
s.send_nowait(orig)
obj = r.recv_nowait()
self.assertEqual(obj, orig)
self.assertIsNot(obj, orig)
def test_send_recv_nowait_main_with_default(self):
r, _ = interpreters.create_channel()
obj = r.recv_nowait(None)
self.assertIsNone(obj)
def test_send_recv_nowait_same_interpreter(self):
interp = interpreters.create()
interp.run(dedent("""
from test.support import interpreters
r, s = interpreters.create_channel()
orig = b'spam'
s.send_nowait(orig)
obj = r.recv_nowait()
assert obj == orig, 'expected: obj == orig'
# When going back to the same interpreter we get the same object.
assert obj is not orig, 'expected: obj is not orig'
"""))
@unittest.skip('broken (see BPO-...)')
def test_send_recv_nowait_different_interpreters(self):
r1, s1 = interpreters.create_channel()
r2, s2 = interpreters.create_channel()
orig1 = b'spam'
s1.send_nowait(orig1)
out = _run_output(
interpreters.create(),
dedent(f"""
obj1 = r.recv_nowait()
assert obj1 == b'spam', 'expected: obj1 == orig1'
# When going to another interpreter we get a copy.
assert id(obj1) != {id(orig1)}, 'expected: obj1 is not orig1'
orig2 = b'eggs'
print(id(orig2))
s.send_nowait(orig2)
"""),
channels=dict(r=r1, s=s2),
)
obj2 = r2.recv_nowait()
self.assertEqual(obj2, b'eggs')
self.assertNotEqual(id(obj2), int(out))
def test_recv_channel_does_not_exist(self):
ch = interpreters.RecvChannel(1_000_000)
with self.assertRaises(interpreters.ChannelNotFoundError):
ch.recv()
def test_send_channel_does_not_exist(self):
ch = interpreters.SendChannel(1_000_000)
with self.assertRaises(interpreters.ChannelNotFoundError):
ch.send(b'spam')
def test_recv_nowait_channel_does_not_exist(self):
ch = interpreters.RecvChannel(1_000_000)
with self.assertRaises(interpreters.ChannelNotFoundError):
ch.recv_nowait()
def test_send_nowait_channel_does_not_exist(self):
ch = interpreters.SendChannel(1_000_000)
with self.assertRaises(interpreters.ChannelNotFoundError):
ch.send_nowait(b'spam')
def test_recv_nowait_empty(self):
ch, _ = interpreters.create_channel()
with self.assertRaises(interpreters.ChannelEmptyError):
ch.recv_nowait()
def test_recv_nowait_default(self):
default = object()
rch, sch = interpreters.create_channel()
obj1 = rch.recv_nowait(default)
sch.send_nowait(None)
sch.send_nowait(1)
sch.send_nowait(b'spam')
sch.send_nowait(b'eggs')
obj2 = rch.recv_nowait(default)
obj3 = rch.recv_nowait(default)
obj4 = rch.recv_nowait()
obj5 = rch.recv_nowait(default)
obj6 = rch.recv_nowait(default)
self.assertIs(obj1, default)
self.assertIs(obj2, None)
self.assertEqual(obj3, 1)
self.assertEqual(obj4, b'spam')
self.assertEqual(obj5, b'eggs')
self.assertIs(obj6, default)
if __name__ == "__main__":
unittest.main()
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