def create_and_destroy_kernel(self):
"""
Set up a new kernel with two associated consoles, then shut everything
down.
"""
kernel = InternalIPKernel()
kernel.init_ipkernel(gui_backend=None)
kernel.new_qt_console()
kernel.new_qt_console()
kernel.shutdown()
def test_shutdown_closes_console_pipes(self):
kernel = InternalIPKernel()
kernel.init_ipkernel(gui_backend=None)
console = kernel.new_qt_console()
self.assertFalse(console.stdout.closed)
self.assertFalse(console.stderr.closed)
kernel.shutdown()
self.assertTrue(console.stdout.closed)
self.assertTrue(console.stderr.closed)
def test_lifecycle(self):
kernel = InternalIPKernel()
self.assertIsNone(kernel.ipkernel)
kernel.init_ipkernel(gui_backend=None)
self.assertIsNotNone(kernel.ipkernel)
self.assertIsInstance(kernel.ipkernel, ipykernel.kernelapp.IPKernelApp)
kernel.new_qt_console()
kernel.new_qt_console()
self.assertEqual(len(kernel.consoles), 2)
kernel.shutdown()
self.assertIsNone(kernel.ipkernel)
self.assertEqual(len(kernel.consoles), 0)
def test_initialize_twice(self):
# Trying to re-initialize an already initialized IPKernelApp can
# happen right now as a result of refactoring, but eventually
# it should be an error. For now, it's a warning.
kernel = InternalIPKernel()
self.assertIsNone(kernel.ipkernel)
kernel.init_ipkernel(gui_backend=None)
try:
self.assertIsNotNone(kernel.ipkernel)
ipkernel = kernel.ipkernel
with warnings.catch_warnings(record=True) as warn_msgs:
warnings.simplefilter("always", category=DeprecationWarning)
kernel.init_ipkernel(gui_backend=None)
# Check that the existing kernel has not been replaced.
self.assertIs(ipkernel, kernel.ipkernel)
finally:
kernel.shutdown()
# Check that we got the expected warning message.
self.assertEqual(len(warn_msgs), 1)
message = str(warn_msgs[0].message)
self.assertIn("already been initialized", message)
def test_init_ipkernel_with_explicit_gui_backend(self):
loop = tornado.ioloop.IOLoop.current()
# Kernel initialization adds an "enter_eventloop" call to the
# ioloop event loop queue. Mock to avoid modifying the actual event
# loop.
with mock.patch.object(loop, "add_callback") as mock_add_callback:
with warnings.catch_warnings(record=True) as warn_msgs:
warnings.simplefilter("always", category=DeprecationWarning)
# Use of gui_backend is deprecated.
kernel = InternalIPKernel()
kernel.init_ipkernel(gui_backend="qt4")
kernel.shutdown()
mock_add_callback.reset_mock()
# Check that we got the expected warning message.
matching_messages = [
msg for msg in warn_msgs
if "gui_backend argument is deprecated" in str(msg.message)
]
self.assertEqual(len(matching_messages), 1)
def test_initial_namespace(self):
kernel = InternalIPKernel(initial_namespace=[("x", 42.1)])
kernel.init_ipkernel(gui_backend=None)
self.assertIn("x", kernel.namespace)
self.assertEqual(kernel.namespace["x"], 42.1)
kernel.shutdown()