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Make test.test_support.EnvironmentVarGuard behave like a dictionary.

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All changes are mirrored to the underlying os.environ dict, but rolled back
on exit from the with block.
This commit is contained in:
Walter Dörwald 2009-05-01 17:35:37 +00:00
parent ca87fa5a5b
commit 6733bed57e
11 changed files with 72 additions and 67 deletions
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25
Lib/test/test_tcl.py
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@ -144,23 +144,20 @@ class TclTest(unittest.TestCase):
import sys
if sys.platform.startswith(('win', 'darwin', 'cygwin')):
return # no failure possible on windows?
if 'DISPLAY' in os.environ:
old_display = os.environ['DISPLAY']
del os.environ['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.
display = os.popen('echo $DISPLAY').read().strip()
if display:
return
try:
with test_support.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.
display = os.popen('echo $DISPLAY').read().strip()
if display:
return
tcl = Tcl()
self.assertRaises(TclError, tcl.winfo_geometry)
self.assertRaises(TclError, tcl.loadtk)
finally:
if old_display is not None:
os.environ['DISPLAY'] = old_display
def test_main():
test_support.run_unittest(TclTest, TkinterTest)