Add coverage for CTR-DRBG corner case function behaviours
diff --git a/tests/suites/test_suite_ctr_drbg.data b/tests/suites/test_suite_ctr_drbg.data
index 5c69d20..6661658 100644
--- a/tests/suites/test_suite_ctr_drbg.data
+++ b/tests/suites/test_suite_ctr_drbg.data
@@ -727,6 +727,9 @@
 CTR_DRBG write/update seed file
 ctr_drbg_seed_file:"no_such_dir/file":MBEDTLS_ERR_CTR_DRBG_FILE_IO_ERROR
 
+CTR_DRBG Special Behaviours
+ctr_drbg_special_behaviours:
+
 CTR_DRBG self test
 ctr_drbg_selftest: