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　晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 . Prv8 Shell

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# Test mock_tk.Text class against tkinter.Text class by running same tests with both.
import unittest
from test.test_support import requires

from _tkinter import TclError

class TextTest(object):

    hw = 'hello\nworld'  # usual initial insert after initialization
    hwn = hw+'\n'  # \n present at initialization, before insert

    Text = None
    def setUp(self):
        self.text = self.Text()

    def test_init(self):
        self.assertEqual(self.text.get('1.0'), '\n')
        self.assertEqual(self.text.get('end'), '')

    def test_index_empty(self):
        index = self.text.index

        for dex in (-1.0, 0.3, '1.-1', '1.0', '1.0 lineend', '1.end', '1.33',
                'insert'):
            self.assertEqual(index(dex), '1.0')

        for dex in 'end', 2.0, '2.1', '33.44':
            self.assertEqual(index(dex), '2.0')

    def test_index_data(self):
        index = self.text.index
        self.text.insert('1.0', self.hw)

        for dex in -1.0, 0.3, '1.-1', '1.0':
            self.assertEqual(index(dex), '1.0')

        for dex in '1.0 lineend', '1.end', '1.33':
            self.assertEqual(index(dex), '1.5')

        for dex in 'end',  '33.44':
            self.assertEqual(index(dex), '3.0')

    def test_get(self):
        get = self.text.get
        Equal = self.assertEqual
        self.text.insert('1.0', self.hw)

        Equal(get('end'), '')
        Equal(get('end', 'end'), '')
        Equal(get('1.0'), 'h')
        Equal(get('1.0', '1.1'), 'h')
        Equal(get('1.0', '1.3'), 'hel')
        Equal(get('1.1', '1.3'), 'el')
        Equal(get('1.0', '1.0 lineend'), 'hello')
        Equal(get('1.0', '1.10'), 'hello')
        Equal(get('1.0 lineend'), '\n')
        Equal(get('1.1', '2.3'), 'ello\nwor')
        Equal(get('1.0', '2.5'), self.hw)
        Equal(get('1.0', 'end'), self.hwn)
        Equal(get('0.0', '5.0'), self.hwn)

    def test_insert(self):
        insert = self.text.insert
        get = self.text.get
        Equal = self.assertEqual

        insert('1.0', self.hw)
        Equal(get('1.0', 'end'), self.hwn)

        insert('1.0', '')  # nothing
        Equal(get('1.0', 'end'), self.hwn)

        insert('1.0', '*')
        Equal(get('1.0', 'end'), '*hello\nworld\n')

        insert('1.0 lineend', '*')
        Equal(get('1.0', 'end'), '*hello*\nworld\n')

        insert('2.3', '*')
        Equal(get('1.0', 'end'), '*hello*\nwor*ld\n')

        insert('end', 'x')
        Equal(get('1.0', 'end'), '*hello*\nwor*ldx\n')

        insert('1.4', 'x\n')
        Equal(get('1.0', 'end'), '*helx\nlo*\nwor*ldx\n')

    def test_no_delete(self):
        # if index1 == 'insert' or 'end' or >= end, there is no deletion
        delete = self.text.delete
        get = self.text.get
        Equal = self.assertEqual
        self.text.insert('1.0', self.hw)

        delete('insert')
        Equal(get('1.0', 'end'), self.hwn)

        delete('end')
        Equal(get('1.0', 'end'), self.hwn)

        delete('insert', 'end')
        Equal(get('1.0', 'end'), self.hwn)

        delete('insert', '5.5')
        Equal(get('1.0', 'end'), self.hwn)

        delete('1.4', '1.0')
        Equal(get('1.0', 'end'), self.hwn)

        delete('1.4', '1.4')
        Equal(get('1.0', 'end'), self.hwn)

    def test_delete_char(self):
        delete = self.text.delete
        get = self.text.get
        Equal = self.assertEqual
        self.text.insert('1.0', self.hw)

        delete('1.0')
        Equal(get('1.0', '1.end'), 'ello')

        delete('1.0', '1.1')
        Equal(get('1.0', '1.end'), 'llo')

        # delete \n and combine 2 lines into 1
        delete('1.end')
        Equal(get('1.0', '1.end'), 'lloworld')

        self.text.insert('1.3', '\n')
        delete('1.10')
        Equal(get('1.0', '1.end'), 'lloworld')

        self.text.insert('1.3', '\n')
        delete('1.3', '2.0')
        Equal(get('1.0', '1.end'), 'lloworld')

    def test_delete_slice(self):
        delete = self.text.delete
        get = self.text.get
        Equal = self.assertEqual
        self.text.insert('1.0', self.hw)

        delete('1.0', '1.0 lineend')
        Equal(get('1.0', 'end'), '\nworld\n')

        delete('1.0', 'end')
        Equal(get('1.0', 'end'), '\n')

        self.text.insert('1.0', self.hw)
        delete('1.0', '2.0')
        Equal(get('1.0', 'end'), 'world\n')

        delete('1.0', 'end')
        Equal(get('1.0', 'end'), '\n')

        self.text.insert('1.0', self.hw)
        delete('1.2', '2.3')
        Equal(get('1.0', 'end'), 'held\n')

    def test_multiple_lines(self):  # insert and delete
        self.text.insert('1.0', 'hello')

        self.text.insert('1.3', '1\n2\n3\n4\n5')
        self.assertEqual(self.text.get('1.0', 'end'), 'hel1\n2\n3\n4\n5lo\n')

        self.text.delete('1.3', '5.1')
        self.assertEqual(self.text.get('1.0', 'end'), 'hello\n')

    def test_compare(self):
        compare = self.text.compare
        Equal = self.assertEqual
        # need data so indexes not squished to 1,0
        self.text.insert('1.0', 'First\nSecond\nThird\n')

        self.assertRaises(TclError, compare, '2.2', 'op', '2.2')

        for op, less1, less0, equal, greater0, greater1 in (
                ('<', True, True, False, False, False),
                ('<=', True, True, True, False, False),
                ('>', False, False, False, True, True),
                ('>=', False, False, True, True, True),
                ('==', False, False, True, False, False),
                ('!=', True, True, False, True, True),
                ):
            Equal(compare('1.1', op, '2.2'), less1, op)
            Equal(compare('2.1', op, '2.2'), less0, op)
            Equal(compare('2.2', op, '2.2'), equal, op)
            Equal(compare('2.3', op, '2.2'), greater0, op)
            Equal(compare('3.3', op, '2.2'), greater1, op)


class MockTextTest(TextTest, unittest.TestCase):

    @classmethod
    def setUpClass(cls):
        from idlelib.idle_test.mock_tk import Text
        cls.Text = Text

    def test_decode(self):
        # test endflags (-1, 0) not tested by test_index (which uses +1)
        decode = self.text._decode
        Equal = self.assertEqual
        self.text.insert('1.0', self.hw)

        Equal(decode('end', -1), (2, 5))
        Equal(decode('3.1', -1), (2, 5))
        Equal(decode('end',  0), (2, 6))
        Equal(decode('3.1', 0), (2, 6))


class TkTextTest(TextTest, unittest.TestCase):

    @classmethod
    def setUpClass(cls):
        requires('gui')
        from Tkinter import Tk, Text
        cls.Text = Text
        cls.root = Tk()

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


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

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