1 files changed, 9 insertions, 1 deletions
diff --git a/cli/tests/unit/error_test.ts b/cli/tests/unit/error_test.ts
index 444b0445a..f3c9e20e6 100644
--- a/cli/tests/unit/error_test.ts
+++ b/cli/tests/unit/error_test.ts
@@ -1,5 +1,5 @@
 // Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
-import { assert } from "./test_util.ts";
+import { assert, assertThrows, fail } from "./test_util.ts";
 
 Deno.test("Errors work", () => {
   assert(new Deno.errors.NotFound("msg") instanceof Error);
@@ -22,3 +22,11 @@ Deno.test("Errors work", () => {
   assert(new Deno.errors.Busy("msg") instanceof Error);
   assert(new Deno.errors.NotSupported("msg") instanceof Error);
 });
+
+Deno.test("Errors have some tamper resistance", () => {
+  // deno-lint-ignore no-explicit-any
+  (Object.prototype as any).get = () => {};
+  assertThrows(() => fail("test error"), Error, "test error");
+  // deno-lint-ignore no-explicit-any
+  delete (Object.prototype as any).get;
+});