Add tests for overreads in pem_read_buffer()
diff --git a/tests/suites/test_suite_pem.data b/tests/suites/test_suite_pem.data
index 339b4d3..065e4a2 100644
--- a/tests/suites/test_suite_pem.data
+++ b/tests/suites/test_suite_pem.data
@@ -24,3 +24,4 @@
 
 PEM read (unknown encryption algorithm)
 mbedtls_pem_read_buffer:"^":"$":"^\nProc-Type\: 4,ENCRYPTED\nDEK-Info\: AES-,00$":MBEDTLS_ERR_PEM_UNKNOWN_ENC_ALG
+