tests: Silence various error messages and warnings.

This silences glib warnings which are due to testing
of error handling, deprecation warnings which we ignore
since we want to continue testing deprecated code and
other error output of code which is supposed to fail.

To reduce code duplication and make things easier
this introduces a shared helper module containing
various context managers and decorators which allow
testing and silencing of warnings and errors.

https://bugzilla.gnome.org/show_bug.cgi?id=751156

1 files changed, 18 insertions, 10 deletions

diff --git a/tests/test_everything.py b/tests/test_everything.py
index 5be9ce4d..4a2df771 100644
--- a/tests/test_everything.py
+++ b/tests/test_everything.py
@@ -26,6 +26,9 @@ try:
 except:
     Gtk = None
 
+from helper import capture_exceptions
+
+
 if sys.version_info < (3, 0):
     UNICHAR = "\xe2\x99\xa5"
     PY2_UNICODE_UNICHAR = unicode(UNICHAR, 'UTF-8')
@@ -624,7 +627,10 @@ class TestCallbacks(unittest.TestCase):
         # note that we do NOT expect the ZeroDivisionError to be propagated
         # through from the callback, as it crosses the Python<->C boundary
         # twice. (See GNOME #616279)
-        Everything.test_simple_callback(callback)
+        with capture_exceptions() as exc:
+            Everything.test_simple_callback(callback)
+        self.assertTrue(exc)
+        self.assertEqual(exc[0].type, ZeroDivisionError)
 
     def test_double_callback_exception(self):
         """
@@ -643,7 +649,10 @@ class TestCallbacks(unittest.TestCase):
         # note that we do NOT expect the ZeroDivisionError to be propagated
         # through from the callback, as it crosses the Python<->C boundary
         # twice. (See GNOME #616279)
-        Everything.test_simple_callback(callback)
+        with capture_exceptions() as exc:
+            Everything.test_simple_callback(callback)
+        self.assertTrue(exc)
+        self.assertEqual(exc[0].type, ZeroDivisionError)
 
     def test_return_value_callback(self):
         TestCallbacks.called = False
@@ -1050,17 +1059,16 @@ class TestClosures(unittest.TestCase):
         def callback(variant):
             return 'no_variant'
 
-        # reset last error
-        sys.last_type = None
-
-        # this does not directly raise an exception (see
-        # https://bugzilla.gnome.org/show_bug.cgi?id=616279)
-        result = Everything.test_closure_variant(callback, GLib.Variant('i', 42))
+        with capture_exceptions() as exc:
+            # this does not directly raise an exception (see
+            # https://bugzilla.gnome.org/show_bug.cgi?id=616279)
+            result = Everything.test_closure_variant(callback, GLib.Variant('i', 42))
         # ... but the result shouldn't be a string
         self.assertEqual(result, None)
         # and the error should be shown
-        self.assertEqual(sys.last_type, TypeError)
-        self.assertTrue('return value' in str(sys.last_value), sys.last_value)
+        self.assertEqual(len(exc), 1)
+        self.assertEqual(exc[0].type, TypeError)
+        self.assertTrue('return value' in str(exc[0].value), exc[0].value)
 
 
 @unittest.skipUnless(has_cairo, 'built without cairo support')