Edit: test_undodelegator.py
"""Unittest for UndoDelegator in idlelib.UndoDelegator. Coverage about 80% (retest). """ from test.support import requires requires('gui') import unittest from unittest.mock import Mock from tkinter import Text, Tk from idlelib.UndoDelegator import UndoDelegator 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.percolator.insertfilter(self.delegator) self.delegator.bell = Mock(wraps=self.delegator.bell) 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)
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