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diff --git a/programs/charon/lib/utils/tester.h b/programs/charon/lib/utils/tester.h
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+/**
+ * @file tester.h
+ *
+ * @brief Interface of tester_t.
+ *
+ */
+
+/*
+ * Copyright (C) 2005 Jan Hutter, Martin Willi
+ * Hochschule fuer Technik Rapperswil
+ *
+ * This program 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 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program 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.
+ */
+
+#ifndef TESTER_H_
+#define TESTER_H_
+
+#include <stdio.h>
+
+#include <types.h>
+
+
+/* must be defined here cause it is used in test_t */
+typedef struct protected_tester_t protected_tester_t;
+
+typedef struct test_t test_t;
+
+/**
+ * @brief Representing a specified test.
+ * 
+ * @ingroup utils
+ */
+struct test_t {
+	/**
+	 * Testfunction called for this test.
+	 * 
+	 * @param tester		associated tester_t object
+	 */
+	void (*test_function) (protected_tester_t * tester);
+	
+	/**
+	 * Name of the test.
+	 */
+	char * test_name;
+};
+
+
+typedef struct tester_t tester_t;
+
+/**
+ * @brief A class to perform tests.
+ * 
+ * @b Constructors:
+ *  - tester_create()
+ * 
+ * @ingroup utils
+ */
+struct tester_t {
+	/**
+	 * @brief Test all testcases in array tests with specific tester_t object.
+	 *
+	 * @param tester 	tester_t object
+ 	 * @param tests		pointer	to an array of test_t-pointers.
+ 	 * 			      	The last item has to be NULL to mark end of array.
+	 */
+	void (*perform_tests) (tester_t *tester,test_t **tests);
+
+	/**
+	 * @brief Run a specific test case.
+	 *
+	 * @param this 		tester_t object
+	 * @param test 		pointer to a test_t object which will be performed
+	 */
+ 	void (*perform_test) (tester_t *tester, test_t *test);
+
+	/**
+	 * @brief Destroys a tester_t object.
+	 *
+	 * @param tester 	tester_t object
+	 */
+	void (*destroy) (tester_t *tester);
+};
+
+
+/**
+ * @brief A class used in a specific testcase.
+ * 
+ * For each testcase an object of this type is passed to the testfunction. The testfunction uses this 
+ * object to check specific asserts with protected_tester_t.assert_true and protected_tester_t.assert_false.
+ * 
+ * @b Constructors:
+ *  - tester_create()
+ * 
+ * @ingroup utils
+ */
+struct protected_tester_t {
+	
+	/**
+	 * Public functions of a tester_t object
+	 */
+	tester_t public;
+	
+	/**
+	 * @brief Is called in a testcase to check a specific situation for TRUE.
+	 *
+	 * Log-Values to the tester output are protected from multiple access.
+	 *
+	 * @param this 			tester_t object
+	 * @param to_be_true 	assert which has to be TRUE
+	 * @param assert_name	name of the assertion
+	 */
+	void (*assert_true) (protected_tester_t *tester, bool to_be_true, char *assert_name);
+
+	/**
+	 * @brief Is called in a testcase to check a specific situation for FALSE.
+	 *
+	 * Log-Values to the tester output are protected from multiple access.
+	 *
+	 * @param this 			tester_t object
+	 * @param to_be_false 	assert which has to be FALSE
+	 * @param assert_name	name of the assertion
+	 */
+	void (*assert_false) (protected_tester_t *tester, bool to_be_false, char *assert_name);
+};
+
+
+/**
+ * @brief Creates a tester_t object used to perform tests with.
+ *
+ * @param output 					test output is written to this output.
+ * @param display_succeeded_asserts has to be TRUE, if all asserts should be displayed,
+ * 									FALSE otherwise
+ *
+ * @return							tester_t object
+ * 
+ * @ingroup utils
+ */
+tester_t *tester_create(FILE *output, bool display_succeeded_asserts);
+
+#endif /*TESTER_H_*/