test: assert: fix deepStrictEqual comparing a real array and fake array

ljharb · BethGriggs · commit a22d5e78e11d · 2020-02-06T02:49:07.000Z
PR-URL: #30743 Reviewed-By: Rich Trott <rtrott@gmail.com> Reviewed-By: Michaël Zasso <targos@protonmail.com>
diff --git a/test/parallel/test-assert-deep.js b/test/parallel/test-assert-deep.js
@@ -1050,6 +1050,21 @@ assert.throws(
   assert.deepStrictEqual(a, b);
 }
 
+// Verify that an array and the equivalent fake array object
+// are correctly compared
+{
+  const a = [1, 2, 3];
+  const o = {
+    __proto__: Array.prototype,
+    0: 1,
+    1: 2,
+    2: 3,
+    length: 3,
+  };
+  Object.defineProperty(o, 'length', { enumerable: false });
+  assertNotDeepOrStrict(o, a);
+}
+
 // Verify that extra keys will be tested for when using fake arrays.
 {
   const a = {
