refactor tests

include/app_config.hpp

@@ -360,9 +360,17 @@ public:
   }
 
 #ifdef REPERTORY_TESTING
-  void set_host_config(host_config hc) { hc_ = std::move(hc); }
+  void set_host_config(host_config hc) {
+    config_changed_ = true;
+    hc_ = std::move(hc);
+    save();
+  }
 
-  void set_s3_config(s3_config s3) { s3_config_ = std::move(s3); }
+  void set_s3_config(s3_config s3) {
+    config_changed_ = true;
+    s3_config_ = std::move(s3);
+    save();
+  }
 #endif
 
   void set_is_remote_mount(bool is_remote_mount);