Add testcase to fail multipart cipher tests

Encrypt more than 2 blocks of data, causing both update() calls to
output data as well as the call to finish().

This exposes a test bug where the pointer to a buffer is not updated
as it is filled with data.

Signed-off-by: David Horstmann <david.horstmann@arm.com>
diff --git a/tests/suites/test_suite_psa_crypto.data b/tests/suites/test_suite_psa_crypto.data
index 03cc2ff..c5211f9 100644
--- a/tests/suites/test_suite_psa_crypto.data
+++ b/tests/suites/test_suite_psa_crypto.data
@@ -1971,6 +1971,11 @@
 depends_on:PSA_WANT_ALG_CBC_NO_PADDING:PSA_WANT_KEY_TYPE_AES
 cipher_verify_output_multipart:PSA_ALG_CBC_NO_PADDING:PSA_KEY_TYPE_AES:"2b7e151628aed2a6abf7158809cf4f3c":"6bc1bee22e409f96e93d7e117393172a":16
 
+# Encrypt 48 bytes total, initially 16. This forces both calls to update() to output data.
+PSA symmetric encrypt/decrypt multipart: AES-CBC-nopad, 48 bytes, good
+depends_on:PSA_WANT_ALG_CBC_NO_PADDING:PSA_WANT_KEY_TYPE_AES
+cipher_verify_output_multipart:PSA_ALG_CBC_NO_PADDING:PSA_KEY_TYPE_AES:"2b7e151628aed2a6abf7158809cf4f3c":"6bc1bee22e409f96e93d7e117393172a6bc1bee22e409f96e93d7e117393172a6bc1bee22e409f96e93d7e117393172a":16
+
 PSA symmetric encrypt/decrypt multipart: AES-CBC-PKCS#7, 16 bytes
 depends_on:PSA_WANT_ALG_CBC_PKCS7:PSA_WANT_KEY_TYPE_AES
 cipher_verify_output_multipart:PSA_ALG_CBC_PKCS7:PSA_KEY_TYPE_AES:"2b7e151628aed2a6abf7158809cf4f3c":"6bc1bee22e409f96e93d7e117393172a":16