MPS Reader Tests: Request more data than what's available
Signed-off-by: Hanno Becker <hanno.becker@arm.com>
diff --git a/tests/suites/test_suite_mps.data b/tests/suites/test_suite_mps.data
index a31cc8d..e9bc43d 100644
--- a/tests/suites/test_suite_mps.data
+++ b/tests/suites/test_suite_mps.data
@@ -21,3 +21,6 @@
MPS Reader: Multiple steps, multiple rounds, pausing enabled but unused
mbedtls_mps_reader_no_pausing_multiple_steps_multiple_rounds:1
+
+MPS Reader: Pausing needed but disabled
+mbedtls_mps_reader_pausing_needed_disabled:
diff --git a/tests/suites/test_suite_mps.function b/tests/suites/test_suite_mps.function
index 44b4419..aeaad27 100644
--- a/tests/suites/test_suite_mps.function
+++ b/tests/suites/test_suite_mps.function
@@ -204,3 +204,35 @@
mbedtls_reader_free( &rd );
}
/* END_CASE */
+
+/* BEGIN_CASE depends_on:TEST_SUITE_MPS_READER */
+void mbedtls_mps_reader_pausing_needed_disabled()
+{
+ /* This test exercises the behaviour of the MPS reader when a read requests
+ * of the consumer exceeds what has been provided by the producer, and when
+ * no accumulator is available in the reader.
+ *
+ * In this case, we expect the reader to fail.
+ */
+
+ unsigned char buf[100];
+ unsigned char *tmp;
+ mbedtls_reader rd;
+ for( int i=0; (unsigned) i < sizeof( buf ); i++ )
+ buf[i] = (unsigned char) i;
+
+ /* Preparation (lower layer) */
+ mbedtls_reader_init( &rd, NULL, 0 );
+ TEST_ASSERT( mbedtls_reader_feed( &rd, buf, sizeof( buf ) ) == 0 );
+ /* Consumption (upper layer) */
+ TEST_ASSERT( mbedtls_reader_get( &rd, 50, &tmp, NULL ) == 0 );
+ ASSERT_COMPARE( tmp, 50, buf, 50 );
+ TEST_ASSERT( mbedtls_reader_commit( &rd ) == 0 );
+ TEST_ASSERT( mbedtls_reader_get( &rd, 100, &tmp, NULL ) ==
+ MBEDTLS_ERR_MPS_READER_OUT_OF_DATA );
+ /* Wrapup (lower layer) */
+ TEST_ASSERT( mbedtls_reader_reclaim( &rd, NULL ) ==
+ MBEDTLS_ERR_MPS_READER_NEED_ACCUMULATOR );
+ mbedtls_reader_free( &rd );
+}
+/* END_CASE */
