test textview coverage 100 since all methods and functions create or destroy a viewwindow which is a widget containing a widget etcetera all tests must be gui tests using mock text would not change this other mocks are used to retrieve information about calls if we call viewwindow or wrapper functions with defaults modaltrue utestfalse test hangs on call to waitwindow have also gotten tk error can t invoke event command call wrapper class vw with mock waitwindow method set is tested in scrollabletextframetest the horizontal scrollbar should be shownhidden according to the wrap setting it should only be shown when wrap is set to none wrap none with horizontal scrolling wrap none no horizontal scrolling call viewwindow with modalfalse mock showerror will be used viewfile will return none call viewwindow with utesttrue if we call viewwindow or wrapper functions with defaults modal true _utest false test hangs on call to wait_window have also gotten tk error can t invoke event command used in viewwindowtest call wrapper class vw with mock wait_window unmask real function method set is tested in scrollabletextframetest the horizontal scrollbar should be shown hidden according to the wrap setting it should only be shown when wrap is set to none wrap none with horizontal scrolling wrap none no horizontal scrolling call viewwindow with modal false mock showerror will be used view_file will return none call viewwindow with _utest true
from idlelib import textview as tv
from test.support import requires
requires('gui')

import os
import unittest
from tkinter import Tk, TclError, CHAR, NONE, WORD
from tkinter.ttk import Button
from idlelib.idle_test.mock_idle import Func
from idlelib.idle_test.mock_tk import Mbox_func

def setUpModule():
    global root
    root = Tk()
    root.withdraw()

def tearDownModule():
    global root
    root.update_idletasks()
    root.destroy()
    del root






class VW(tv.ViewWindow):  
    transient = Func()
    grab_set = Func()
    wait_window = Func()



class ViewWindowTest(unittest.TestCase):

    def setUp(self):
        VW.transient.__init__()
        VW.grab_set.__init__()
        VW.wait_window.__init__()

    def test_init_modal(self):
        view = VW(root, 'Title', 'test text')
        self.assertTrue(VW.transient.called)
        self.assertTrue(VW.grab_set.called)
        self.assertTrue(VW.wait_window.called)
        view.ok()

    def test_init_nonmodal(self):
        view = VW(root, 'Title', 'test text', modal=False)
        self.assertFalse(VW.transient.called)
        self.assertFalse(VW.grab_set.called)
        self.assertFalse(VW.wait_window.called)
        view.ok()

    def test_ok(self):
        view = VW(root, 'Title', 'test text', modal=False)
        view.destroy = Func()
        view.ok()
        self.assertTrue(view.destroy.called)
        del view.destroy  
        view.destroy()


class AutoHideScrollbarTest(unittest.TestCase):
    
    def test_forbidden_geometry(self):
        scroll = tv.AutoHideScrollbar(root)
        self.assertRaises(TclError, scroll.pack)
        self.assertRaises(TclError, scroll.place)


class ScrollableTextFrameTest(unittest.TestCase):

    @classmethod
    def setUpClass(cls):
        cls.root = root = Tk()
        root.withdraw()

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

    def make_frame(self, wrap=NONE, **kwargs):
        frame = tv.ScrollableTextFrame(self.root, wrap=wrap, **kwargs)
        def cleanup_frame():
            frame.update_idletasks()
            frame.destroy()
        self.addCleanup(cleanup_frame)
        return frame

    def test_line1(self):
        frame = self.make_frame()
        frame.text.insert('1.0', 'test text')
        self.assertEqual(frame.text.get('1.0', '1.end'), 'test text')

    def test_horiz_scrollbar(self):
        
        
        

        
        frame = self.make_frame(wrap=NONE)
        self.assertEqual(frame.text.cget('wrap'), NONE)
        self.assertIsNotNone(frame.xscroll)

        
        for wrap in [CHAR, WORD]:
            with self.subTest(wrap=wrap):
                frame = self.make_frame(wrap=wrap)
                self.assertEqual(frame.text.cget('wrap'), wrap)
                self.assertIsNone(frame.xscroll)


class ViewFrameTest(unittest.TestCase):

    @classmethod
    def setUpClass(cls):
        cls.root = root = Tk()
        root.withdraw()
        cls.frame = tv.ViewFrame(root, 'test text')

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

    def test_line1(self):
        get = self.frame.text.get
        self.assertEqual(get('1.0', '1.end'), 'test text')



class ViewFunctionTest(unittest.TestCase):

    @classmethod
    def setUpClass(cls):
        cls.orig_error = tv.showerror
        tv.showerror = Mbox_func()

    @classmethod
    def tearDownClass(cls):
        tv.showerror = cls.orig_error
        del cls.orig_error

    def test_view_text(self):
        view = tv.view_text(root, 'Title', 'test text', modal=False)
        self.assertIsInstance(view, tv.ViewWindow)
        self.assertIsInstance(view.viewframe, tv.ViewFrame)
        view.viewframe.ok()

    def test_view_file(self):
        view = tv.view_file(root, 'Title', __file__, 'ascii', modal=False)
        self.assertIsInstance(view, tv.ViewWindow)
        self.assertIsInstance(view.viewframe, tv.ViewFrame)
        get = view.viewframe.textframe.text.get
        self.assertIn('Test', get('1.0', '1.end'))
        view.ok()

    def test_bad_file(self):
        
        view = tv.view_file(root, 'Title', 'abc.xyz', 'ascii', modal=False)
        self.assertIsNone(view)
        self.assertEqual(tv.showerror.title, 'File Load Error')

    def test_bad_encoding(self):
        p = os.path
        fn = p.abspath(p.join(p.dirname(__file__), '..', 'CREDITS.txt'))
        view = tv.view_file(root, 'Title', fn, 'ascii', modal=False)
        self.assertIsNone(view)
        self.assertEqual(tv.showerror.title, 'Unicode Decode Error')

    def test_nowrap(self):
        view = tv.view_text(root, 'Title', 'test', modal=False, wrap='none')
        text_widget = view.viewframe.textframe.text
        self.assertEqual(text_widget.cget('wrap'), 'none')



class ButtonClickTest(unittest.TestCase):

    def setUp(self):
        self.view = None
        self.called = False

    def tearDown(self):
        if self.view:
            self.view.destroy()

    def test_view_text_bind_with_button(self):
        def _command():
            self.called = True
            self.view = tv.view_text(root, 'TITLE_TEXT', 'COMMAND', _utest=True)
        button = Button(root, text='BUTTON', command=_command)
        button.invoke()
        self.addCleanup(button.destroy)

        self.assertEqual(self.called, True)
        self.assertEqual(self.view.title(), 'TITLE_TEXT')
        self.assertEqual(self.view.viewframe.textframe.text.get('1.0', '1.end'),
                         'COMMAND')

    def test_view_file_bind_with_button(self):
        def _command():
            self.called = True
            self.view = tv.view_file(root, 'TITLE_FILE', __file__,
                                     encoding='ascii', _utest=True)
        button = Button(root, text='BUTTON', command=_command)
        button.invoke()
        self.addCleanup(button.destroy)

        self.assertEqual(self.called, True)
        self.assertEqual(self.view.title(), 'TITLE_FILE')
        get = self.view.viewframe.textframe.text.get
        with open(__file__) as f:
            self.assertEqual(get('1.0', '1.end'), f.readline().strip())
            f.readline()
            self.assertEqual(get('3.0', '3.end'), f.readline().strip())


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