Test that xxx_free() functions accept NULL parameter
diff --git a/tests/suites/test_suite_chachapoly.function b/tests/suites/test_suite_chachapoly.function
index 51cc0ab..8e56bf6 100644
--- a/tests/suites/test_suite_chachapoly.function
+++ b/tests/suites/test_suite_chachapoly.function
@@ -139,6 +139,7 @@
memset( mac, 0x00, sizeof( mac ) );
TEST_INVALID_PARAM( mbedtls_chachapoly_init( NULL ) );
+ TEST_VALID_PARAM( mbedtls_chachapoly_free( NULL ) );
/* setkey */
TEST_INVALID_PARAM_RET( MBEDTLS_ERR_POLY1305_BAD_INPUT_DATA,