fix: inspecting prototypes of built-ins with custom inspect implementations should not throw (#11308)

1 files changed, 15 insertions, 1 deletions

diff --git a/cli/tests/unit/blob_test.ts b/cli/tests/unit/blob_test.ts
index f9e506334..ebb91658a 100644
--- a/cli/tests/unit/blob_test.ts
+++ b/cli/tests/unit/blob_test.ts
@@ -1,5 +1,10 @@
 // Copyright 2018-2021 the Deno authors. All rights reserved. MIT license.
-import { assert, assertEquals, unitTest } from "./test_util.ts";
+import {
+  assert,
+  assertEquals,
+  assertStringIncludes,
+  unitTest,
+} from "./test_util.ts";
 import { concat } from "../../../test_util/std/bytes/mod.ts";
 
 unitTest(function blobString(): void {
@@ -104,3 +109,12 @@ unitTest(function blobConstructorNameIsBlob(): void {
   const blob = new Blob();
   assertEquals(blob.constructor.name, "Blob");
 });
+
+unitTest(function blobCustomInspectFunction(): void {
+  const blob = new Blob();
+  assertEquals(
+    Deno.inspect(blob),
+    `Blob { size: 0, type: "" }`,
+  );
+  assertStringIncludes(Deno.inspect(Blob.prototype), "Blob");
+});