tests: add initial test infrastructure

tests/settings.py

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+LANGUAGE_CODE = 'en-us'

tests/test_manager.py

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+from django.contrib.auth.models import User
+from django.core.wsgi import get_wsgi_application
+from webtest import TestApp
+import pytest
+
+pytestmark = pytest.mark.django_db
+
+@pytest.fixture
+def admin_user():
+    try:
+        user = User.objects.get(username='admin')
+    except User.DoesNotExist:
+        user = User.objects.create_superuser('admin', email=None, password='admin')
+    return user
+
+def login(app, username='admin', password='admin'):
+    login_page = app.get('/login/')
+    login_form = login_page.forms[0]
+    login_form['username'] = username
+    login_form['password'] = password
+    resp = login_form.submit()
+    assert resp.status_int == 302
+    return app
+
+def test_access(admin_user):
+    app = login(TestApp(get_wsgi_application()))
+    resp = app.get('/manage/', status=200)
+    assert '/manage/lingo/' in resp.body