1 files changed, 6 insertions, 1 deletions
diff --git a/test/driver.c b/test/driver.c
index 788a77b2d..5183145b4 100644
--- a/test/driver.c
+++ b/test/driver.c
@@ -36,7 +36,7 @@ check_error(mrb_state *mrb)
 }
 
 int
-main(void)
+main(int argc, char **argv)
 {
   mrb_state *mrb;
   mrb_value return_value;
@@ -52,6 +52,11 @@ main(void)
     return EXIT_FAILURE;
   }
 
+  if (argc == 2 && strncmp(argv[1], "-v", 2) == 0) {
+    printf("verbose mode: enable\n\n");
+    mrb_gv_set(mrb, mrb_intern(mrb, "$mrbtest_verbose"), mrb_true_value());
+  }
+
   mrb_init_mrbtest(mrb);
   /* evaluate the test */
   return_value = mrb_load_string(mrb, prog);