- Better buffer handling in mpi_read_file()

diff --git a/tests/suites/test_suite_mpi.data b/tests/suites/test_suite_mpi.data
index ca98f0c..0a8c103 100644
--- a/tests/suites/test_suite_mpi.data
+++ b/tests/suites/test_suite_mpi.data
@@ -61,6 +61,10 @@
 depends_on:POLARSSL_FS_IO
 mpi_read_file:10:"data_files/hash_file_3":"":0
 
+Test mpi_read_file #3 (Input too big)
+depends_on:POLARSSL_FS_IO
+mpi_read_file:10:"data_files/mpi_too_big":"":POLARSSL_ERR_MPI_BUFFER_TOO_SMALL
+
 Base test mpi_write_file #1
 depends_on:POLARSSL_FS_IO
 mpi_write_file:10:"56125680981752282334141896320372489490613963693556392520816017892111350604111697682705498319512049040516698827829292076808006940873974979584527073481012636016353913462376755556720019831187364993587901952757307830896531678727717924":16:"data_files/mpi_write":0