1 files changed, 33 insertions, 0 deletions
diff --git a/tests/unit/error_test.ts b/tests/unit/error_test.ts
new file mode 100644
index 000000000..9ba09ce0d
--- /dev/null
+++ b/tests/unit/error_test.ts
@@ -0,0 +1,33 @@
+// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
+import { assert, assertThrows, fail } from "./test_util.ts";
+
+Deno.test("Errors work", () => {
+  assert(new Deno.errors.NotFound("msg") instanceof Error);
+  assert(new Deno.errors.PermissionDenied("msg") instanceof Error);
+  assert(new Deno.errors.ConnectionRefused("msg") instanceof Error);
+  assert(new Deno.errors.ConnectionReset("msg") instanceof Error);
+  assert(new Deno.errors.ConnectionAborted("msg") instanceof Error);
+  assert(new Deno.errors.NotConnected("msg") instanceof Error);
+  assert(new Deno.errors.AddrInUse("msg") instanceof Error);
+  assert(new Deno.errors.AddrNotAvailable("msg") instanceof Error);
+  assert(new Deno.errors.BrokenPipe("msg") instanceof Error);
+  assert(new Deno.errors.AlreadyExists("msg") instanceof Error);
+  assert(new Deno.errors.InvalidData("msg") instanceof Error);
+  assert(new Deno.errors.TimedOut("msg") instanceof Error);
+  assert(new Deno.errors.Interrupted("msg") instanceof Error);
+  assert(new Deno.errors.WouldBlock("msg") instanceof Error);
+  assert(new Deno.errors.WriteZero("msg") instanceof Error);
+  assert(new Deno.errors.UnexpectedEof("msg") instanceof Error);
+  assert(new Deno.errors.BadResource("msg") instanceof Error);
+  assert(new Deno.errors.Http("msg") instanceof Error);
+  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;
+});