TrilogyAdapterTest: use the proper config

Author: byroot

activerecord/test/cases/adapters/trilogy/trilogy_adapter_test.rb

@@ -9,11 +9,7 @@
 
 class TrilogyAdapterTest < ActiveRecord::TrilogyTestCase
   setup do
-    @configuration = {
-      adapter: "trilogy",
-      username: "rails",
-      database: "activerecord_unittest",
-    }
+    @configuration = ARTest.config.fetch("connections").fetch("trilogy").fetch("arunit").symbolize_keys
 
     @adapter = trilogy_adapter
     @adapter.execute("TRUNCATE books")