fix a typo, update specs

src/vm.c

@@ -1915,7 +1915,7 @@ RETRY_TRY_BLOCK:
         }
         else if ((m.flags & MRB_METHOD_PROTECTED_FL) && mrb_obj_is_kind_of(mrb, recv, ci->u.target_class)) {
           mrb_value args = (ci->n == 15) ? regs[1] : mrb_ary_new_from_values(mrb, ci->n, regs+1);
-          mrb_no_method_error(mrb, mid, args, "proteced method '%n' called for %T", mid, recv);
+          mrb_no_method_error(mrb, mid, args, "protected method '%n' called for %T", mid, recv);
         }
       }
       ci->cci = CINFO_NONE;

test/t/module.rb

@@ -802,14 +802,18 @@ assert('method visibility') do
 
   v = CallTypeTest.new
 
-  assert_raise(NoMethodError) { v.func { :test } }
+  assert_raise_with_message_pattern(NameError, "private method 'func' called for CallTypeTest") do
+    v.func { :test }
+  end
   assert_equal :test, v.test_private { :test }
 
   class CallTypeTest
     protected :func
   end
 
-  assert_raise(NoMethodError) { v.func { :test } }
+  assert_raise_with_message_pattern(NameError, "protected method 'func' called for CallTypeTest") do
+    v.func { :test }
+  end
   assert_equal :test, v.test_protected { :test }
   assert_equal :test, v.test_private { :test }