Re: Simulating keystrokes in a tkinter unit test

Thanks.  I managed to work it out.  I think the problem was twofold:

- I needed to call self.mywidget.focus_force(), because my test root 
wasn't getting focus
- I needed to call self.root.update() before *and* after the key events

This got it working.

Thanks for your feedback!

On 02/01/2018 04:35 PM, Bryan Oakley wrote:
> 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 <[email protected] 
> <mailto:[email protected]>> 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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>

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