Add tests for valid NULL in ccm_free()
diff --git a/tests/suites/test_suite_ccm.data b/tests/suites/test_suite_ccm.data
index a4771b3..819b3b7 100644
--- a/tests/suites/test_suite_ccm.data
+++ b/tests/suites/test_suite_ccm.data
@@ -4,6 +4,9 @@
 CCM - Invalid parameters
 ccm_invalid_param:
 
+CCM - Valid parameters
+ccm_valid_param:
+
 CCM init #1 AES-128: OK
 depends_on:MBEDTLS_AES_C
 mbedtls_ccm_setkey:MBEDTLS_CIPHER_ID_AES:128:0
diff --git a/tests/suites/test_suite_ccm.function b/tests/suites/test_suite_ccm.function
index 1886339..16f9f8e 100644
--- a/tests/suites/test_suite_ccm.function
+++ b/tests/suites/test_suite_ccm.function
@@ -530,3 +530,12 @@
     return;
 }
 /* END_CASE */
+
+/* BEGIN_CASE */
+void ccm_valid_param( )
+{
+    TEST_VALID_PARAM( mbedtls_ccm_free( NULL ) );
+exit:
+    return;
+}
+/* END_CASE */