[Tkinter-discuss] Simulating keystrokes in a tkinter unit test

[Bryan Oakley]

You might need to also generate a <FocusIn> event and/or move the mouse
over the widget with the warp option (widget.event_generate(..., warp=True),
but you may need to also specify an x and y coordinate. I don't remember).
I think some widgets check to see if they have focus, and will ignore
keyboard events if they aren't focused. At least, I vaguely recall having
done that a decade or two ago when I tried writing a tcl/tk testing
harness.

On Wed, Jan 31, 2018 at 12:09 PM, alan moore <me at alandmoore.com> wrote:

> Hi all,
>
> I'm attempting to write a unit test for a custom widget using Python
> unittest.  I'm trying to simulate actual keystrokes in my unit test.
>
> Following the example from the tkinter test suite, I created a test that
> is approximately this:
>
> from tkinter import Entry as MyWidget
> from tkinter.test.support import AbstractTkTest
> import unittest
>
> class TestMyWidget(AbstractTkTest, unittest.TestCase):
>
>     def setUp(self):
>         super().setUp()
>         self.mywidget = self.create()
>         self.mywidget.wait_visibility()
>
>     def tearDown(self):
>         super().tearDown()
>         self.mywidget.destroy()
>
>     def create(self):
>         mw = MyWidget(self.root)
>         mw.pack()
>         return mw
>
>     def _keystroke(self, char):
> self.mywidget.event_generate('<KeyPress-{}>'.format(char))
> self.mywidget.event_generate('<KeyRelease-{}>'.format(char))
>         self.mywidget.update_idletasks()
>
>     def test_key_entry(self):
>         self._keystroke('a')
>         self.assertEqual(self.mywidget.get(), 'a')
>
> if __name__ == '__main__':
>     unittest.main()
>
>
> This doesn't work, though.  The keypresses don't register and create any
> text in the entry.  I can add text using event_generate inside a mainloop,
> but without mainloop it doesn't seem to work.
>
>
> Interestingly, I can use the same method to generate mouse events and they
> seem to be recognized.  Is there a way to make keypresses work without
> mainloop?
>
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