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# -*- coding: utf-8 -*-
"""Tests for CommandChainDispatcher."""
# -----------------------------------------------------------------------------
# Imports
# -----------------------------------------------------------------------------
import pytest
from IPython.core.error import TryNext
from IPython.core.hooks import CommandChainDispatcher
# -----------------------------------------------------------------------------
# Local utilities
# -----------------------------------------------------------------------------
# Define two classes, one which succeeds and one which raises TryNext. Each
# sets the attribute `called` to True when it is called.
class Okay(object):
def __init__(self, message):
self.message = message
self.called = False
def __call__(self):
self.called = True
return self.message
class Fail(object):
def __init__(self, message):
self.message = message
self.called = False
def __call__(self):
self.called = True
raise TryNext(self.message)
# -----------------------------------------------------------------------------
# Test functions
# -----------------------------------------------------------------------------
def test_command_chain_dispatcher_ff():
"""Test two failing hooks"""
fail1 = Fail("fail1")
fail2 = Fail("fail2")
dp = CommandChainDispatcher([(0, fail1), (10, fail2)])
with pytest.raises(TryNext) as e:
dp()
assert str(e.value) == "fail2"
assert fail1.called is True
assert fail2.called is True
def test_command_chain_dispatcher_fofo():
"""Test a mixture of failing and succeeding hooks."""
fail1 = Fail("fail1")
fail2 = Fail("fail2")
okay1 = Okay("okay1")
okay2 = Okay("okay2")
dp = CommandChainDispatcher(
[
(0, fail1),
# (5, okay1), # add this later
(10, fail2),
(15, okay2),
]
)
dp.add(okay1, 5)
assert dp() == "okay1"
assert fail1.called is True
assert okay1.called is True
assert fail2.called is False
assert okay2.called is False
def test_command_chain_dispatcher_eq_priority():
okay1 = Okay("okay1")
okay2 = Okay("okay2")
dp = CommandChainDispatcher([(1, okay1)])
dp.add(okay2, 1)
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