"Test undo, coverage 77%."
# Only test UndoDelegator so far.
from idlelib.undo import UndoDelegator
import unittest
from test.support import requires
requires('gui')
from unittest.mock import Mock
from tkinter import Text, Tk
from idlelib.percolator import Percolator
class UndoDelegatorTest(unittest.TestCase):
@classmethod
def setUpClass(cls):
cls.root = Tk()
cls.text = Text(cls.root)
cls.percolator = Percolator(cls.text)
@classmethod
def tearDownClass(cls):
cls.percolator.redir.close()
del cls.percolator, cls.text
cls.root.destroy()
del cls.root
def setUp(self):
self.delegator = UndoDelegator()
self.delegator.bell = Mock()
self.percolator.insertfilter(self.delegator)
def tearDown(self):
self.percolator.removefilter(self.delegator)
self.text.delete('1.0', 'end')
self.delegator.resetcache()
def test_undo_event(self):
text = self.text
text.insert('insert', 'foobar')
text.insert('insert', 'h')
text.event_generate('<<undo>>')
self.assertEqual(text.get('1.0', 'end'), '\n')
text.insert('insert', 'foo')
text.insert('insert', 'bar')
text.delete('1.2', '1.4')
text.insert('insert', 'hello')
text.event_generate('<<undo>>')
self.assertEqual(text.get('1.0', '1.4'), 'foar')
text.event_generate('<<undo>>')
self.assertEqual(text.get('1.0', '1.6'), 'foobar')
text.event_generate('<<undo>>')
self.assertEqual(text.get('1.0', '1.3'), 'foo')
text.event_generate('<<undo>>')
self.delegator.undo_event('event')
self.assertTrue(self.delegator.bell.called)
def test_redo_event(self):
text = self.text
text.insert('insert', 'foo')
text.insert('insert', 'bar')
text.delete('1.0', '1.3')
text.event_generate('<<undo>>')
text.event_generate('<<redo>>')
self.assertEqual(text.get('1.0', '1.3'), 'bar')
text.event_generate('<<redo>>')
self.assertTrue(self.delegator.bell.called)
def test_dump_event(self):
"""
Dump_event cannot be tested directly without changing
environment variables. So, test statements in dump_event
indirectly
"""
text = self.text
d = self.delegator
text.insert('insert', 'foo')
text.insert('insert', 'bar')
text.delete('1.2', '1.4')
self.assertTupleEqual((d.pointer, d.can_merge), (3, True))
text.event_generate('<<undo>>')
self.assertTupleEqual((d.pointer, d.can_merge), (2, False))
def test_get_set_saved(self):
# test the getter method get_saved
# test the setter method set_saved
# indirectly test check_saved
d = self.delegator
self.assertTrue(d.get_saved())
self.text.insert('insert', 'a')
self.assertFalse(d.get_saved())
d.saved_change_hook = Mock()
d.set_saved(True)
self.assertEqual(d.pointer, d.saved)
self.assertTrue(d.saved_change_hook.called)
d.set_saved(False)
self.assertEqual(d.saved, -1)
self.assertTrue(d.saved_change_hook.called)
def test_undo_start_stop(self):
# test the undo_block_start and undo_block_stop methods
text = self.text
text.insert('insert', 'foo')
self.delegator.undo_block_start()
text.insert('insert', 'bar')
text.insert('insert', 'bar')
self.delegator.undo_block_stop()
self.assertEqual(text.get('1.0', '1.3'), 'foo')
# test another code path
self.delegator.undo_block_start()
text.insert('insert', 'bar')
self.delegator.undo_block_stop()
self.assertEqual(text.get('1.0', '1.3'), 'foo')
def test_addcmd(self):
text = self.text
# when number of undo operations exceeds max_undo
self.delegator.max_undo = max_undo = 10
for i in range(max_undo + 10):
text.insert('insert', 'foo')
self.assertLessEqual(len(self.delegator.undolist), max_undo)
if __name__ == '__main__':
unittest.main(verbosity=2, exit=False)
