Issue #5462.

Defining batch that makes->destroys->check a reserve.
Iterating the batch N times is the next step.

src/exchange-lib/test_exchange_api_new.c

@@ -909,17 +909,16 @@ run (void *cls,
       ("reserve-open-close-wirewatch",
        CONFIG_FILE_EXPIRE_RESERVE_NOW),
 
-    TALER_TESTING_cmd_status ("reserve-open-close-status",
-                              is->exchange,
-                              "reserve-open-close-key",
-                              "EUR:0",
-                              MHD_HTTP_OK),
-
     /* Wire back to the bank */
     TALER_TESTING_cmd_exec_aggregator
       ("reserve-open-close-aggregation",
        CONFIG_FILE_EXPIRE_RESERVE_NOW),
 
+    TALER_TESTING_cmd_status ("reserve-open-close-status",
+                              is->exchange,
+                              "reserve-open-close-key",
+                              "EUR:0",
+                              MHD_HTTP_OK),
     TALER_TESTING_cmd_end ()
   };
 
@@ -949,11 +948,8 @@ run (void *cls,
     TALER_TESTING_cmd_batch ("payback",
                              payback),
 
-    #if 0
     TALER_TESTING_cmd_batch ("reserve-open-close",
                              reserve_open_close),
-    #endif
-
     /**
      * End the suite.  Fixme: better to have a label for this
      * too, as it shows a "(null)" token on logs.

src/exchange-lib/testing_api_cmd_status.c

@@ -109,7 +109,8 @@ reserve_status_cb
   if (0 != TALER_amount_cmp (&eb, balance))
   {
     GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
-                "Unexpected amount in reserve\n");
+                "Unexpected amount in reserve: %s\n",
+                TALER_amount_to_string (balance));
     TALER_TESTING_interpreter_fail (ss->is);
     return;
   }
@@ -167,6 +168,8 @@ status_run (void *cls,
     return;
   }
 
+  /* NOTE: the following line might generate a ERROR log
+   * statements, but it can be ignored.  */
   if (GNUNET_OK == TALER_TESTING_get_trait_reserve_priv
       (create_reserve,
        0,