extension methods test config
diff --git a/test/configs/extension_methods/analysis_options.yaml b/test/configs/extension_methods/analysis_options.yaml
new file mode 100644
index 0000000..5e78895
--- /dev/null
+++ b/test/configs/extension_methods/analysis_options.yaml
@@ -0,0 +1,3 @@
+analyzer:
+  enable-experiment:
+    - extension-methods