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import os
import sys
import unittest
import test.support as test_support
from test.support import os_helper
from tkinter import Tcl, TclError
test_support.requires('gui')
class TkLoadTest(unittest.TestCase):
@unittest.skipIf('DISPLAY' not in os.environ, 'No $DISPLAY set.')
def testLoadTk(self):
tcl = Tcl()
self.assertRaises(TclError,tcl.winfo_geometry)
tcl.loadtk()
self.assertEqual('1x1+0+0', tcl.winfo_geometry())
tcl.destroy()
def testLoadTkFailure(self):
old_display = None
if sys.platform.startswith(('win', 'darwin', 'cygwin')):
# no failure possible on windows?
# XXX Maybe on tk older than 8.4.13 it would be possible,
# see tkinter.h.
return
with os_helper.EnvironmentVarGuard() as env:
if 'DISPLAY' in os.environ:
del env['DISPLAY']
# on some platforms, deleting environment variables
# doesn't actually carry through to the process level
# because they don't support unsetenv
# If that's the case, abort.
with os.popen('echo $DISPLAY') as pipe:
display = pipe.read().strip()
if display:
return
tcl = Tcl()
self.assertRaises(TclError, tcl.winfo_geometry)
self.assertRaises(TclError, tcl.loadtk)
if __name__ == "__main__":
unittest.main()
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