Add tests to verify correctness of the switching provider task

tests/conftest.py

@@ -113,3 +113,17 @@ def set_config(app, name, value):
     app.config[name] = value
     yield
     app.config[name] = old_val
+
+
+@contextmanager
+def set_config_values(app, dict):
+    old_values = {}
+
+    for key in dict:
+        old_values[key] = app.config.get(key)
+        app.config[key] = dict[key]
+
+    yield
+
+    for key in dict:
+        app.config[key] = old_values[key]