diff --git a/src/exchange-lib/test_exchange_api_new.c b/src/exchange-lib/test_exchange_api_new.c
index a33f8d014..8d39ca087 100644
--- a/src/exchange-lib/test_exchange_api_new.c
+++ b/src/exchange-lib/test_exchange_api_new.c
@@ -290,7 +290,7 @@ run (void *cls,
     /**
      * Melt the rest of the coin's value
      * (EUR:4.00 = 3x EUR:1.03 + 7x EUR:0.13) */
-    TALER_TESTING_cmd_refresh_melt
+    TALER_TESTING_cmd_refresh_melt_double
       ("refresh-melt-1", is->exchange, "EUR:4",
        "refresh-withdraw-coin-1", MHD_HTTP_OK),
     /**
diff --git a/src/exchange-lib/test_exchange_api_twisted.c b/src/exchange-lib/test_exchange_api_twisted.c
index 8c2492816..3b875cd5e 100644
--- a/src/exchange-lib/test_exchange_api_twisted.c
+++ b/src/exchange-lib/test_exchange_api_twisted.c
@@ -114,7 +114,7 @@ static struct GNUNET_OS_Process *twisterd;
 #define CMD_TRANSFER_TO_EXCHANGE(label,amount) \
    TALER_TESTING_cmd_fakebank_transfer (label, amount, \
      fakebank_url, USER_ACCOUNT_NO, EXCHANGE_ACCOUNT_NO, \
-     USER_LOGIN_NAME, USER_LOGIN_PASS, EXCHANGE_URL)
+     USER_LOGIN_NAME, USER_LOGIN_PASS, exchange_url)
 
 /**
  * Run wire transfer of funds from some user's account to the
@@ -142,6 +142,48 @@ run (void *cls,
 
   struct TALER_TESTING_Command commands[] = {
 
+    CMD_TRANSFER_TO_EXCHANGE ("refresh-create-reserve",
+                              "EUR:5.01"),
+
+    /**
+     * Make previous command effective.
+     */
+    CMD_EXEC_WIREWATCH ("wirewatch"),
+
+    /**
+     * Withdraw EUR:5.
+     */
+    TALER_TESTING_cmd_withdraw_amount
+      ("refresh-withdraw-coin",
+       is->exchange,
+       "refresh-create-reserve",
+       "EUR:5",
+       MHD_HTTP_OK),
+
+    TALER_TESTING_cmd_deposit
+      ("refresh-deposit-partial",
+       is->exchange,
+       "refresh-withdraw-coin",
+       0,
+       TALER_TESTING_make_wire_details
+         (42,
+          fakebank_url),
+       "{\"items\":[{\"name\":\"ice cream\",\
+                     \"value\":\"EUR:1\"}]}",
+       GNUNET_TIME_UNIT_ZERO,
+       "EUR:1",
+       MHD_HTTP_OK),
+
+    /**
+     * Melt the rest of the coin's value
+     * (EUR:4.00 = 3x EUR:1.03 + 7x EUR:0.13) */
+    TALER_TESTING_cmd_refresh_melt
+      ("refresh-melt",
+       is->exchange,
+       "EUR:4",
+       "refresh-withdraw-coin",
+       MHD_HTTP_OK),
+
     /**
      * End the suite.  Fixme: better to have a label for this
      * too, as it shows a "(null)" token on logs.
diff --git a/src/exchange-lib/test_exchange_api_twisted.conf b/src/exchange-lib/test_exchange_api_twisted.conf
index 992e878c7..d64ea6596 100644
--- a/src/exchange-lib/test_exchange_api_twisted.conf
+++ b/src/exchange-lib/test_exchange_api_twisted.conf
@@ -33,6 +33,24 @@ TALER_TEST_HOME = test_exchange_api_home/
 # Currency supported by the exchange (can only be one)
 CURRENCY = EUR
 
+[exchange_keys]
+
+# how long is one signkey valid?
+signkey_duration = 4 weeks
+
+# how long are the signatures with the signkey valid?
+legal_duration = 2 years
+
+# how long do we generate denomination and signing keys
+# ahead of time?
+lookahead_sign = 32 weeks 1 day
+
+# how long do we provide to clients denomination and signing keys
+# ahead of time?
+lookahead_provide = 4 weeks 1 day
+
+
+
 [exchange]
 
 # HTTP port the exchange listens to
diff --git a/src/exchange-lib/testing_api_cmd_refresh.c b/src/exchange-lib/testing_api_cmd_refresh.c
index 8233f673c..97f06cc30 100644
--- a/src/exchange-lib/testing_api_cmd_refresh.c
+++ b/src/exchange-lib/testing_api_cmd_refresh.c
@@ -56,6 +56,20 @@ struct MeltDetails
  */
 struct RefreshMeltState
 {
+
+  /**
+   * if set to GNUNET_YES, then two /refresh/melt operations
+   * will be performed.  This is needed to trigger the code
+   * path that manages those already-made requests.  Note: it
+   * is not possible to just copy-and-paste a test refresh melt
+   * CMD to have the same effect, because every data preparation
+   * generates new planchets that (in turn) make the whole "hash"
+   * different from any previous one, therefore NOT allowing the
+   * exchange to pick any previous /rerfesh/melt operation from
+   * the database.
+   */
+  unsigned int double_melt;
+
   /**
    * Fixme: figure out this data purpose.
    */
@@ -628,6 +642,18 @@ melt_cb (void *cls,
     return;
   }
   rms->noreveal_index = noreveal_index;
+
+  if (GNUNET_YES == rms->double_melt)
+  {
+    TALER_LOG_DEBUG ("Doubling the melt (%s)\n",
+                     rms->is->commands[rms->is->ip].label);
+    rms->rmh = TALER_EXCHANGE_refresh_melt
+      (rms->exchange, rms->refresh_data_length,
+       rms->refresh_data, &melt_cb, rms);
+    rms->double_melt = GNUNET_NO;
+    return;
+  }
+
   TALER_TESTING_interpreter_next (rms->is);
 }
 
@@ -866,6 +892,49 @@ TALER_TESTING_cmd_refresh_melt
   return cmd;
 }
 
+/**
+ * Create a "refresh melt" command, that does TWO /refresh/melt
+ * requests.
+ *
+ * @param label command label
+ * @param exchange connection to the exchange
+ * @param amount Fixme
+ * @param coin_reference reference to a command that will provide
+ *        a coin to refresh
+ * @param expected_response_code expected HTTP code
+ */
+
+struct TALER_TESTING_Command
+TALER_TESTING_cmd_refresh_melt_double
+  (const char *label,
+   struct TALER_EXCHANGE_Handle *exchange,
+   const char *amount,
+   const char *coin_reference,
+   unsigned int expected_response_code)
+{
+  struct RefreshMeltState *rms;
+  struct MeltDetails md;
+  struct TALER_TESTING_Command cmd;
+
+  md.coin_reference = coin_reference;
+  md.amount = amount;
+
+  rms = GNUNET_new (struct RefreshMeltState);
+  rms->amount = amount;
+  rms->melted_coin = md;
+  rms->expected_response_code = expected_response_code;
+  rms->exchange = exchange;
+  rms->double_melt = GNUNET_YES;
+
+  cmd.label = label;
+  cmd.cls = rms;
+  cmd.run = &refresh_melt_run;
+  cmd.cleanup = &refresh_melt_cleanup;
+  cmd.traits = &refresh_melt_traits;
+  
+  return cmd;
+}
+
 /**
  * Extract information from a command that is useful for other
  * commands.
diff --git a/src/exchange/taler-exchange-httpd_refresh_melt.c b/src/exchange/taler-exchange-httpd_refresh_melt.c
index 384589df1..08ceaa868 100644
--- a/src/exchange/taler-exchange-httpd_refresh_melt.c
+++ b/src/exchange/taler-exchange-httpd_refresh_melt.c
@@ -259,9 +259,12 @@ refresh_melt_transaction (void *cls,
                              &rm);
   if (GNUNET_DB_STATUS_SUCCESS_ONE_RESULT == qs)
   {
+    TALER_LOG_DEBUG ("Found already-melted coin\n");
     *mhd_ret = reply_refresh_melt_success (connection,
 					   &rmc->refresh_session.rc,
 					   rm.session.noreveal_index);
+    /* FIXME: is it normal to return "hard error" upon
+     * _finding_ some data into the database?  */
     return GNUNET_DB_STATUS_HARD_ERROR;
   }
   if (0 > qs)
diff --git a/src/include/taler_testing_lib.h b/src/include/taler_testing_lib.h
index dce92ceae..910495e4b 100644
--- a/src/include/taler_testing_lib.h
+++ b/src/include/taler_testing_lib.h
@@ -660,6 +660,26 @@ TALER_TESTING_cmd_refresh_melt
    const char *coin_reference,
    unsigned int expected_response_code);
 
+/**
+ * Create a "refresh melt" command, that does TWO /refresh/melt
+ * requests.
+ *
+ * @param label command label
+ * @param exchange connection to the exchange
+ * @param amount Fixme
+ * @param coin_reference reference to a command that will provide
+ *        a coin to refresh
+ * @param expected_response_code expected HTTP code
+ */
+
+struct TALER_TESTING_Command
+TALER_TESTING_cmd_refresh_melt_double
+  (const char *label,
+   struct TALER_EXCHANGE_Handle *exchange,
+   const char *amount,
+   const char *coin_reference,
+   unsigned int expected_response_code);
+
 
 /**
  * Create a "refresh reveal" command.