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+##Build
+~~~
+$ ./autogen.sh
+$ ./configure --enable-c-unit-tests --prefix=/usr --sysconfdir=/etc --enable-profile-coverage
+$ make
+~~~
+
+~~~
+$ ./test-fwknop.pl --enable-profile-coverage-check --loopback lo
+~~~
+
+The HAVE_C_UNIT_TESTS constant is used in source files to define c-unit test code. 
+Source code is built against libcunit.
+
+##Run test suites
+Once the build is complete, two test programs allow the user to run the tests suites:
+ * fwknopd_utests: program to run fwknopd c unit test suites
+ * fwknop_utests: program to run fwknop c unit test suites
+
+~~~
+$ test/c-unit-tests/fwknopd_utests
+
+     CUnit - A unit testing framework for C - Version 2.1-2
+     http://cunit.sourceforge.net/
+
+Suite: Access test suite
+  Test: check compare_port_list function ...FAILED
+    1. ../../server/access.c:2017  - compare_port_list(acc_pl, in1_pl, 0) == 0
+
+Run Summary:    Type  Total    Ran Passed Failed Inactive
+              suites      1      1    n/a      0        0
+               tests      1      1      0      1        0
+             asserts      6      6      5      1      n/a
+
+Elapsed time =    0.000 seconds
+~~~
+
+~~~
+$ test/c-unit-tests/fwknop_utests
+
+     CUnit - A unit testing framework for C - Version 2.1-2
+     http://cunit.sourceforge.net/
+
+Suite: Config init test suite
+  Test: Check critcial vars ...passed
+  Test: Check var_bitmask functions ...passed
+
+Run Summary:    Type  Total    Ran Passed Failed Inactive
+              suites      1      1    n/a      0        0
+               tests      2      2      2      0        0
+             asserts     12     12     12      0      n/a
+
+Elapsed time =    0.000 seconds
+~~~
+
+##Manage C unit tests
+C unit tests are implemented in source files directly and registered in a test suite.
+All test suites are then added to fwknopd or fwknop test programs
+
+In order to add new tests, the user must follow the below steps:
+ * Declare the tests suite
+ * Create one or more unit tests
+ * Create a function to register new tests
+
+###Declare the tests suite
+
+In access.c file:
+
+~~~
+ #ifdef HAVE_C_UNIT_TESTS
+ DECLARE_TEST_SUITE(access, "Access test suite");
+ #endif
+~~~
+
+In the above example, we create a test suite using the DECLARE_TEST_SUITE macro:
+ * the test suite is named "access".
+ * the test suite description is "Access test suite" and is displayed on the console 
+   when the test program is executed
+
+###Create unit tests
+
+In access.c file:
+
+#ifdef HAVE_C_UNIT_TESTS
+
+~~~
+DECLARE_UTEST(compare_port_list, "check compare_port_list function")
+{
+    acc_port_list_t *in1_pl = NULL;
+    acc_port_list_t *in2_pl = NULL;
+    acc_port_list_t *acc_pl = NULL;
+
+    /* Match any test */
+    free_acc_port_list(in1_pl);
+    free_acc_port_list(acc_pl);
+    add_port_list_ent(&in1_pl, "udp/6002");
+    add_port_list_ent(&in2_pl, "udp/6002, udp/6003");
+    add_port_list_ent(&acc_pl, "udp/6002, udp/6003");
+    CU_ASSERT(compare_port_list(in1_pl, acc_pl, 1) == 1);       /* Only one match is needed from access port list - 1 */
+    CU_ASSERT(compare_port_list(in2_pl, acc_pl, 1) == 1);       /* Only match is needed from access port list - 2 */
+    CU_ASSERT(compare_port_list(in1_pl, acc_pl, 0) == 1);       /* All ports must match access port list - 1 */
+    CU_ASSERT(compare_port_list(in2_pl, acc_pl, 0) == 1);       /* All ports must match access port list - 2 */
+    CU_ASSERT(compare_port_list(acc_pl, in1_pl, 0) == 0);       /* All ports must match in1 port list - 1 */
+    CU_ASSERT(compare_port_list(acc_pl, in2_pl, 0) == 1);       /* All ports must match in2 port list - 2 */
+}
+
+#endif /* HAVE_C_UNIT_TESTS */
+~~~
+
+In the above example, we create a c-unit test using the DECLARE_UTEST macro:
+ * the unit test is named "compare_port_list". This id must be unique
+ * the unit test description is "check compare_port_list function" and is displayed on the console 
+   when the test program is executed
+
+###Create a function to register new tests
+
+In access.c file:
+
+~~~
+#ifdef HAVE_C_UNIT_TESTS
+
+int register_ts_access(void)
+{
+    ts_init(&TEST_SUITE(access), TEST_SUITE_DESCR(access), NULL, NULL);
+    ts_add_utest(&TEST_SUITE(access), UTEST_FCT(compare_port_list), UTEST_DESCR(compare_port_list));
+
+    return register_ts(&TEST_SUITE(access));
+}
+#endif /* HAVE_C_UNIT_TESTS */
+~~~
+
+In access.h file:
+
+~~~
+#ifdef HAVE_C_UNIT_TESTS
+int register_ts_access(void);
+#endif
+~~~
+In fwknopd_utests.c file:
+
+~~~
+static void register_test_suites(void)
+{
+        register_ts_access();
+}
+~~~
+
+The register_ts_access function create the new test suite and add unit test to it.
+
+###Check gcov coverage
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