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diff --git a/src/lib/testing_api_cmd_sleep.c b/src/lib/testing_api_cmd_sleep.c
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+/*
+ This file is part of TALER
+ (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_cmd_sleep.c
+ * @brief command(s) to sleep for a bit
+ * @author Christian Grothoff
+ */
+#include "platform.h"
+#include "taler_json_lib.h"
+#include <gnunet/gnunet_curl_lib.h>
+#include "exchange_api_handle.h"
+#include "taler_testing_lib.h"
+
+
+/**
+ * State for a "sleep" CMD.
+ */
+struct SleepState
+{
+
+ /**
+ * How long should we sleep?
+ */
+ unsigned int duration;
+};
+
+
+/**
+ * Run the command.
+ *
+ * @param cls closure.
+ * @param cmd the command to execute.
+ * @param is the interpreter state.
+ */
+static void
+sleep_run (void *cls,
+ const struct TALER_TESTING_Command *cmd,
+ struct TALER_TESTING_Interpreter *is)
+{
+ struct SleepState *ss = cls;
+
+ sleep (ss->duration);
+ TALER_TESTING_interpreter_next (is);
+}
+
+
+/**
+ * Cleanup the state from a "sleep" CMD.
+ *
+ * @param cls closure.
+ * @param cmd the command which is being cleaned up.
+ */
+static void
+sleep_cleanup (void *cls,
+ const struct TALER_TESTING_Command *cmd)
+{
+ struct SleepState *ss = cls;
+
+ GNUNET_free (ss);
+}
+
+
+/**
+ * Sleep for @a duration_s seconds.
+ *
+ * @param label command label.
+ * @param duration_s number of seconds to sleep
+ * @return the command.
+ */
+struct TALER_TESTING_Command
+TALER_TESTING_cmd_sleep (const char *label,
+ unsigned int duration_s)
+{
+ struct SleepState *ss;
+
+ ss = GNUNET_new (struct SleepState);
+ ss->duration = duration_s;
+
+
+ struct TALER_TESTING_Command cmd = {
+ .cls = ss,
+ .label = label,
+ .run = &sleep_run,
+ .cleanup = &sleep_cleanup
+ };
+
+ return cmd;
+}