GH-5: Create a fixture for getting the list of available backends

Author: ArtyomVancyan

tests/conftest.py

@@ -0,0 +1,26 @@
+import importlib
+import os
+
+import pytest
+import social_core.backends as backends
+from social_core.backends.oauth import BaseOAuth2
+
+package_path = backends.__path__[0]
+
+
+@pytest.fixture
+def backends():
+    backend_instances = []
+    for module in os.listdir(package_path):
+        try:
+            module_instance = importlib.import_module("social_core.backends.%s" % module[:-3])
+            backend_instances.extend([
+                attr for attr in module_instance.__dict__.values()
+                if type(attr) is type and all([
+                    issubclass(attr, BaseOAuth2),
+                    attr is not BaseOAuth2,
+                ])
+            ])
+        except ImportError:
+            continue
+    return backend_instances