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# -*- coding: utf-8 -*-
"""Tests for CommandChainDispatcher."""
from __future__ import absolute_import
#-----------------------------------------------------------------------------
# Imports
#-----------------------------------------------------------------------------
import nose.tools as nt
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(u'fail1')
fail2 = Fail(u'fail2')
dp = CommandChainDispatcher([(0, fail1),
(10, fail2)])
try:
dp()
except TryNext as e:
nt.assert_equal(str(e), u'fail2')
else:
assert False, "Expected exception was not raised."
nt.assert_true(fail1.called)
nt.assert_true(fail2.called)
def test_command_chain_dispatcher_fofo():
"""Test a mixture of failing and succeeding hooks."""
fail1 = Fail(u'fail1')
fail2 = Fail(u'fail2')
okay1 = Okay(u'okay1')
okay2 = Okay(u'okay2')
dp = CommandChainDispatcher([(0, fail1),
# (5, okay1), # add this later
(10, fail2),
(15, okay2)])
dp.add(okay1, 5)
nt.assert_equal(dp(), u'okay1')
nt.assert_true(fail1.called)
nt.assert_true(okay1.called)
nt.assert_false(fail2.called)
nt.assert_false(okay2.called)
def test_command_chain_dispatcher_eq_priority():
okay1 = Okay(u'okay1')
okay2 = Okay(u'okay2')
dp = CommandChainDispatcher([(1, okay1)])
dp.add(okay2, 1)
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