diff --git a/tests/suites/test_suite_mpi.function b/tests/suites/test_suite_mpi.function
index 07427d5..c41ca69 100644
--- a/tests/suites/test_suite_mpi.function
+++ b/tests/suites/test_suite_mpi.function
@@ -448,8 +448,17 @@
     mbedtls_mpi X, A;
     mbedtls_mpi_init( &X ); mbedtls_mpi_init( &A );
 
-    TEST_ASSERT( mbedtls_mpi_read_string( &X, radix_X, input_X ) == 0 );
     TEST_ASSERT( mbedtls_mpi_read_string( &A, radix_A, input_A ) == 0 );
+
+    TEST_ASSERT( mbedtls_mpi_read_string( &X, radix_X, input_X ) == 0 );
+    TEST_ASSERT( mbedtls_mpi_sub_abs( &X, &X, &X ) == 0 );
+    TEST_ASSERT( mbedtls_mpi_cmp_int( &X, 0 ) == 0 );
+
+    TEST_ASSERT( mbedtls_mpi_read_string( &X, radix_X, input_X ) == 0 );
+    TEST_ASSERT( mbedtls_mpi_add_abs( &X, &X, &X ) == 0 );
+    TEST_ASSERT( mbedtls_mpi_cmp_mpi( &X, &A ) == 0 );
+
+    TEST_ASSERT( mbedtls_mpi_read_string( &X, radix_X, input_X ) == 0 );
     TEST_ASSERT( mbedtls_mpi_add_mpi( &X, &X, &X ) == 0 );
     TEST_ASSERT( mbedtls_mpi_cmp_mpi( &X, &A ) == 0 );