Use monkeypath fixture to teardown app config

Closes #27.

Author: vitalk

pytest_flask/__init__.py

@@ -1,4 +1,4 @@
 #!/usr/bin/env python
 # -*- coding: utf-8 -*-
 
-__version__ = "0.7.4"
+__version__ = "0.7.5"

pytest_flask/plugin.py

@@ -94,7 +94,7 @@ def teardown():
 
 
 @pytest.fixture(autouse=True)
-def _configure_application(request):
+def _configure_application(request, monkeypatch):
     """Use `pytest.mark.app` decorator to pass options to your application
     factory::
 
@@ -110,7 +110,7 @@ def test_something(app):
     options = request.keywords.get('app', None)
     if options:
         for key, value in options.kwargs.items():
-            app.config[key.upper()] = value
+            monkeypatch.setitem(app.config, key.upper(), value)
 
 
 def pytest_configure(config):

tests/test_markers.py

@@ -2,6 +2,15 @@
 # -*- coding: utf-8 -*-
 import pytest
 
+from flask import Flask
+
+
+@pytest.fixture(scope='session')
+def app():
+    app = Flask(__name__)
+    app.config['SECRET_KEY'] = '42'
+    return app
+
 
 class TestAppMarker:
 
@@ -12,3 +21,6 @@ def test_not_debug_app(self, app):
     @pytest.mark.app(foo=42)
     def test_update_application_config(self, config):
         assert config['FOO'] == 42
+
+    def test_application_config_teardown(self, config):
+        assert 'FOO' not in config