tests: add check on sizeof() operator

tests/test_platform.c

@@ -64,6 +64,7 @@ const char* test_platform__global_h()
 const char* test_platform__compiler()
 {
     /* Check that initialization with { 0 } works as expected */
+    {
         const gmio_transfer_t trsf_null_bracket0 = { 0 };
         gmio_transfer_t trsf_null_memset0;
 
@@ -78,6 +79,13 @@ const char* test_platform__compiler()
         UTEST_ASSERT(sizeof(gmio_transfer_t) >= (sizeof(gmio_stream_t)
                                                  + sizeof(gmio_buffer_t)
                                                  + sizeof(gmio_task_iface_t)));
+    }
+
+    /* Check sizeof() operator with fixed-size arrays */
+    {
+        uint8_t buff[4 * 1024]; /* 4KB */
+        UTEST_ASSERT(sizeof(buff) == 4 * 1024);
+    }
 
     /* gmio doesn't support platforms where NULL != 0 */
     UTEST_ASSERT(NULL == 0);