Add Cipher layer corner case test coverage
diff --git a/tests/suites/test_suite_cipher.aes.data b/tests/suites/test_suite_cipher.aes.data
index 9c21cfc..9b39bc9 100644
--- a/tests/suites/test_suite_cipher.aes.data
+++ b/tests/suites/test_suite_cipher.aes.data
@@ -1097,3 +1097,6 @@
 AES-256-ECB Decrypt NIST KAT #12
 depends_on:MBEDTLS_AES_C
 test_vec_ecb:MBEDTLS_CIPHER_AES_256_ECB:MBEDTLS_DECRYPT:"0000000000000000000000000000000000000000000000000000000000000000":"9b80eefb7ebe2d2b16247aa0efc72f5d":"e0000000000000000000000000000000":0
+
+Cipher Corner Case behaviours
+cipher_special_behaviours: