Add an install test

geocoder/extension/sql/00_install_test.sql

@@ -0,0 +1,16 @@
+-- Install dependencies
+CREATE EXTENSION postgis;
+CREATE EXTENSION schema_triggers;
+CREATE EXTENSION plpythonu;
+CREATE EXTENSION cartodb;
+
+-- Install the extension
+CREATE EXTENSION cdb_geocoder;
+
+-- Mock the varnish invalidation function
+CREATE OR REPLACE FUNCTION public.cdb_invalidate_varnish(table_name text) RETURNS void AS $$
+BEGIN
+  RETURN;
+END
+$$
+LANGUAGE plpgsql;