neovim / pynvim

test/test_concurrency.py

from threading import Timer


def test_interrupt_from_another_thread(vim):
    timer = Timer(0.5, lambda: vim.async_call(lambda: vim.stop_loop()))
    timer.start()
    assert vim.next_message() is None


def test_exception_in_threadsafe_call(vim):
    # an exception in a threadsafe_call shouldn't crash the entire host
    msgs = []
    vim.async_call(lambda: [vim.eval("3"), undefined_variable])  # noqa: F821

The variable undefined_variable does not seem to be defined.

    timer = Timer(0.5, lambda: vim.async_call(lambda: vim.stop_loop()))
    timer.start()
    vim.run_loop(None, None, err_cb=msgs.append)
    assert len(msgs) == 1
    msgs[0].index('NameError')
    msgs[0].index('undefined_variable')