Clear BDD process settings between each test

Fixes #1310

tests/end2end/fixtures/quteprocess.py

@@ -494,7 +494,13 @@ class QuteProc(testprocess.Process):
         if skip_texts:
             pytest.skip(', '.join(skip_texts))
 
-    def _after_start(self):
+    def before_test(self):
+        """Clear settings before every test."""
+        super().before_test()
+        self.send_cmd(':config-clear')
+        self._init_settings()
+
+    def _init_settings(self):
         """Adjust some qutebrowser settings after starting."""
         settings = [
             ('messages.timeout', '0'),

tests/end2end/fixtures/test_quteprocess.py

@@ -47,6 +47,9 @@ class FakeConfig:
         '--verbose': False,
     }
 
+    def __init__(self):
+        self.webengine = False
+
     def getoption(self, name):
         return self.ARGS[name]