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diff --git a/src/lib/testing_api_trait_time.c b/src/lib/testing_api_trait_time.c
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+/*
+ This file is part of TALER
+ Copyright (C) 2018 Taler Systems SA
+
+ TALER is free software; you can redistribute it and/or modify it
+ under the terms of the GNU General Public License as published
+ by the Free Software Foundation; either version 3, or (at your
+ option) any later version.
+
+ TALER is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ General Public License for more details.
+
+ You should have received a copy of the GNU General Public
+ License along with TALER; see the file COPYING. If not, see
+ <http://www.gnu.org/licenses/>
+*/
+
+/**
+ * @file exchange-lib/testing_api_trait_time.c
+ * @brief traits to offer time stamps.
+ * @author Marcello Stanisci
+ */
+#include "platform.h"
+#include "taler_json_lib.h"
+#include <gnunet/gnunet_curl_lib.h>
+#include "exchange_api_handle.h"
+#include "taler_signatures.h"
+#include "taler_testing_lib.h"
+
+#define TALER_TESTING_TRAIT_TIME_ABS "time-abs"
+
+/**
+ * Obtain a absolute time from @a cmd.
+ *
+ * @param cmd command to extract trait from
+ * @param index which time stamp to pick if
+ * @a cmd has multiple on offer.
+ * @param time[out] set to the wanted WTID.
+ * @return #GNUNET_OK on success
+ */
+int
+TALER_TESTING_get_trait_absolute_time
+ (const struct TALER_TESTING_Command *cmd,
+ unsigned int index,
+ const struct GNUNET_TIME_Absolute **time)
+{
+ return cmd->traits (cmd->cls,
+ (const void **) time,
+ TALER_TESTING_TRAIT_TIME_ABS,
+ index);
+}
+
+
+/**
+ * Offer a absolute time.
+ *
+ * @param index associate the object with this index
+ * @param time which object should be returned
+ * @return the trait.
+ */
+struct TALER_TESTING_Trait
+TALER_TESTING_make_trait_absolute_time
+ (unsigned int index,
+ const struct GNUNET_TIME_Absolute *time)
+{
+ struct TALER_TESTING_Trait ret = {
+ .index = index,
+ .trait_name = TALER_TESTING_TRAIT_TIME_ABS,
+ .ptr = (const void *) time
+ };
+ return ret;
+}
+
+/* end of testing_api_trait_time.c */