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diff --git a/src/include/taler_testing_lib.h b/src/include/taler_testing_lib.h
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+++ b/src/include/taler_testing_lib.h
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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 include/taler_testing_lib.h
+ * @brief API for writing an interpreter to test Taler components
+ * @author Christian Grothoff <christian@grothoff.org>
+ * @author Marcello Stanisci
+ */
+#ifndef TALER_TESTING_LIB_H
+#define TALER_TESTING_LIB_H
+
+#include "taler_util.h"
+#include <gnunet/gnunet_json_lib.h>
+#include "taler_json_lib.h"
+#include <microhttpd.h>
+
+/* ******************* Generic interpreter logic ****************** */
+
+/**
+ * Global state of the interpreter, used by a command
+ * to access information about other commands.
+ */
+struct TALER_TESTING_Interpreter;
+
+
+/**
+ * A command to be run by the interpreter.
+ */
+struct TALER_TESTING_Command
+{
+
+  /**
+   * Closure for all commands with command-specific context
+   * information.
+   */
+  void *cls;
+
+  /**
+   * Label for the command.
+   */
+  const char *label;
+
+  /**
+   * Runs the command.  Note that upon return, the interpreter
+   * will not automatically run the next command, as the command
+   * may continue asynchronously in other scheduler tasks.  Thus,
+   * the command must ensure to eventually call
+   * #TALER_TESTING_interpreter_next() or
+   * #TALER_TESTING_interpreter_fail().
+   *
+   * @param i interpreter state
+   */
+  void
+  (*run)(void *cls,
+         const struct TALER_TESTING_Command *cmd,
+         struct TALER_TESTING_Interpreter *i);
+
+
+  /**
+   * Clean up after the command.  Run during forced termination
+   * (CTRL-C) or test failure or test success.
+   *
+   * @param cls closure
+   */
+  void
+  (*cleanup)(void *cls,
+             const struct TALER_TESTING_Command *cmd);
+
+  /**
+   * Extract information from a command that is useful for other
+   * commands.
+   *
+   * @param cls closure
+   * @param ret[out] result (could be anything)
+   * @param trait name of the trait
+   * @param selector more detailed information about which object
+   *                 to return in case there were multiple generated
+   *                 by the command
+   * @return #GNUNET_OK on success
+   */
+  int
+  (*traits)(void *cls,
+            void **ret,
+            const char *trait,
+            const char *selector);
+
+};
+
+
+/**
+ * Lookup command by label.
+ */
+const struct TALER_TESTING_Command *
+TALER_TESTING_interpreter_lookup_command (struct TALER_TESTING_Interpreter *i,
+                                          const char *label);
+
+
+/**
+ * Obtain main execution context for the main loop.
+ */
+struct GNUNET_CURL_Context *
+TALER_TESTING_interpreter_get_context (struct TALER_TESTING_Interpreter *is);
+
+
+/**
+ * Current command is done, run the next one.
+ */
+void
+TALER_TESTING_interpreter_next (struct TALER_TESTING_Interpreter *is);
+
+/**
+ * Current command failed, clean up and fail the test case.
+ */
+void
+TALER_TESTING_interpreter_fail (struct TALER_TESTING_Interpreter *is);
+
+/**
+ * Create command array terminator.
+ */
+struct TALER_TESTING_Command
+TALER_TESTING_cmd_end (void);
+
+
+void
+TALER_TESTING_run (struct TALER_TESTING_Interpreter *is,
+                   struct TALER_TESTING_Command *commands);
+
+
+typedef void
+(*TALER_TESTING_Main)(void *cls,
+                      struct TALER_TESTING_Interpreter *is);
+
+
+/**
+ * Initialize scheduler loop and curl context for the testcase.
+ */
+int
+TALER_TESTING_setup (TALER_TESTING_Main main_cb,
+                     void *main_cb_cls);
+
+
+
+
+/* ****************** Specific interpreter commands **************** */
+
+/**
+ * Perform a wire transfer (formerly Admin-add-incoming)
+ *
+ * @return NULL on failure
+ */
+struct TALER_TESTING_Command
+TALER_TESTING_cmd_fakebank_transfer (const char *label,
+                                     const char *amount,
+                                     uint64_t debit_account_no,
+                                     uint64_t credit_account_no,
+                                     const char *auth_username,
+                                     const char *auth_password);
+
+
+/**
+ * Create withdraw command.
+ *
+ * @return NULL on failure
+ */
+struct TALER_TESTING_Command
+TALER_TESTING_cmd_withdraw_amount (const char *label,
+                                   struct TALER_EXCHANGE_Handle *exchange,
+                                   const char *reserve_reference,
+                                   const char *amount,
+                                   unsigned int expected_response_code);
+
+
+
+
+/* ********************** Generic trait logic for implementing traits ******************* */
+
+/**
+ * A trait.
+ */
+struct TALER_TESTING_Trait
+{
+  const char *selector;
+
+  const char *trait_name;
+
+  const void *ptr;
+};
+
+
+
+struct TALER_TESTING_Trait
+TALER_TESTING_trait_end (void);
+
+
+int
+TALER_TESTING_get_trait (const struct TALER_TESTING_Trait *traits,
+                         void **ret,
+                         const char *trait,
+                         const char *selector);
+
+
+/* ****************** Specific traits supported by this component *************** */
+
+struct TALER_TESTING_Trait
+TALER_TESTING_make_trait_reserve_priv (const char *selector,
+                                       const struct TALER_ReservePrivateKeyP *reserve_priv);
+
+
+/**
+ * Obtain a reserve private key from a @a cmd.
+ *
+ * @param cmd command to extract trait from
+ * @param selector which coin to pick if @a cmd has multiple on offer
+ * @param reserve_priv[out] set to the private key of the reserve
+ * @return #GNUNET_OK on success
+ */
+int
+TALER_TESTING_get_trait_reserve_priv (const struct TALER_TESTING_Command *cmd,
+                                      const char *selector,
+                                      struct TALER_ReservePrivateKeyP **reserve_priv);
+
+
+/**
+ * @param selector
+ */
+struct TALER_TESTING_Trait
+TALER_TESTING_make_trait_coin_priv (const char *selector,
+                                    const struct TALER_CoinSpendPrivateKeyP *coin_priv);
+
+
+/**
+ * Obtain a coin private key from a @a cmd.
+ *
+ * @param cmd command to extract trait from
+ * @param selector which coin to pick if @a cmd has multiple on offer
+ * @param coin_priv[out] set to the private key of the coin
+ * @return #GNUNET_OK on success
+ */
+int
+TALER_TESTING_get_trait_coin_priv (const struct TALER_TESTING_Command *cmd,
+                                   const char *selector,
+                                   struct TALER_CoinSpendPrivateKeyP **coin_priv);
+
+
+
+
+
+#endif