Add test for unexpected error logging.

tests/integration/quteprocess.py

@@ -60,6 +60,7 @@ class QuteProc(testprocess.Process):
     executing_command = pyqtSignal()
     setting_done = pyqtSignal()
     url_loaded = pyqtSignal()
+    got_error = pyqtSignal()
 
     def __init__(self, httpbin, parent=None):
         super().__init__(parent)
@@ -106,6 +107,8 @@ class QuteProc(testprocess.Process):
         elif (log_line.category == 'webview' and
                 url_loaded_pattern.match(log_line.message)):
             self.url_loaded.emit()
+        elif log_line.loglevel in ['WARNING', 'ERROR']:
+                self.got_error.emit()
 
         return log_line
 

tests/integration/test_quteprocess.py

@@ -0,0 +1,34 @@
+# vim: ft=python fileencoding=utf-8 sts=4 sw=4 et:
+
+# Copyright 2015 Florian Bruhin (The Compiler) <mail@qutebrowser.org>
+#
+# This file is part of qutebrowser.
+#
+# qutebrowser is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# qutebrowser is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with qutebrowser.  If not, see <http://www.gnu.org/licenses/>.
+
+"""Test the quteproc fixture used for tests."""
+
+import pytest
+
+import testprocess  # pylint: disable=import-error
+
+
+def test_quteproc_error_message(qtbot, quteproc):
+    """Make sure the test fails with an unexpected error message."""
+    with qtbot.waitSignal(quteproc.got_error, raising=True):
+        quteproc.send_cmd(':message-error test')
+    # Usually we wouldn't call this from inside a test, but here we force the
+    # error to occur during the test rather than at teardown time.
+    with pytest.raises(pytest.fail.Exception):
+        quteproc.after_test()