fix settings tests

Author: P403n1x87

tests/internal/test_settings.py

@@ -13,7 +13,13 @@
 
 @pytest.fixture
 def config():
-    yield Config()
+    import ddtrace
+
+    original_config = ddtrace.config
+    ddtrace.config = Config()
+    yield ddtrace.config
+    # Reset the config to its original state
+    ddtrace.config = original_config
 
 
 def _base_rc_config(cfg):