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✏️ test_parenmatch.py

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"""Test idlelib.ParenMatch."""
# This must currently be a gui test because ParenMatch methods use
# several text methods not defined on idlelib.idle_test.mock_tk.Text.

import unittest
from test.test_support import requires
from Tkinter import Tk, Text
from idlelib.ParenMatch import ParenMatch

class Mock:  # 2.7 does not have unittest.mock
    def __init__(self, *args, **kwargs):
        self.called = False

def __call__(self, *args, **kwargs):
        self.called = True

def reset_mock(self, *args, **kwargs):
        self.called = False

def after(self, *args, **kwargs):
        pass

class DummyEditwin:
    def __init__(self, text):
        self.text = text
        self.indentwidth = 8
        self.tabwidth = 8
        self.context_use_ps1 = True

class ParenMatchTest(unittest.TestCase):

@classmethod
    def setUpClass(cls):
        requires('gui')
        cls.root = Tk()
        cls.text = Text(cls.root)
        cls.editwin = DummyEditwin(cls.text)
        cls.editwin.text_frame = Mock()

@classmethod
    def tearDownClass(cls):
        del cls.text, cls.editwin
        cls.root.destroy()
        del cls.root

def tearDown(self):
        self.text.delete('1.0', 'end')

def test_paren_expression(self):
        """
        Test ParenMatch with 'expression' style.
        """
        text = self.text
        pm = ParenMatch(self.editwin)
        pm.set_style('expression')

text.insert('insert', 'def foobar(a, b')
        pm.flash_paren_event('event')
        self.assertIn('<<parenmatch-check-restore>>', text.event_info())
        self.assertTupleEqual(text.tag_prevrange('paren', 'end'),
                             ('1.10', '1.15'))
        text.insert('insert', ')')
        pm.restore_event()
        self.assertNotIn('<<parenmatch-check-restore>>', text.event_info())
        self.assertEqual(text.tag_prevrange('paren', 'end'), ())

# paren_closed_event can only be tested as below
        pm.paren_closed_event('event')
        self.assertTupleEqual(text.tag_prevrange('paren', 'end'),
                                                ('1.10', '1.16'))

def test_paren_default(self):
        """
        Test ParenMatch with 'default' style.
        """
        text = self.text
        pm = ParenMatch(self.editwin)
        pm.set_style('default')

text.insert('insert', 'def foobar(a, b')
        pm.flash_paren_event('event')
        self.assertIn('<<parenmatch-check-restore>>', text.event_info())
        self.assertTupleEqual(text.tag_prevrange('paren', 'end'),
                             ('1.10', '1.11'))
        text.insert('insert', ')')
        pm.restore_event()
        self.assertNotIn('<<parenmatch-check-restore>>', text.event_info())
        self.assertEqual(text.tag_prevrange('paren', 'end'), ())

def test_paren_corner(self):
        """
        Test corner cases in flash_paren_event and paren_closed_event.

These cases force conditional expression and alternate paths.
        """
        text = self.text
        pm = ParenMatch(self.editwin)

text.insert('insert', '# this is a commen)')
        self.assertIsNone(pm.paren_closed_event('event'))

text.insert('insert', '\ndef')
        self.assertIsNone(pm.flash_paren_event('event'))
        self.assertIsNone(pm.paren_closed_event('event'))

text.insert('insert', ' a, *arg)')
        self.assertIsNone(pm.paren_closed_event('event'))

def test_handle_restore_timer(self):
        pm = ParenMatch(self.editwin)
        pm.restore_event = Mock()
        pm.handle_restore_timer(0)
        self.assertTrue(pm.restore_event.called)
        pm.restore_event.reset_mock()
        pm.handle_restore_timer(1)
        self.assertFalse(pm.restore_event.called)

if __name__ == '__main__':
    unittest.main(verbosity=2)

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✏️ test_parenmatch.py