1 files changed, 125 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/ShadowRealm/WrappedFunction/length.js b/js/src/tests/test262/built-ins/ShadowRealm/WrappedFunction/length.js
new file mode 100644
index 0000000000..058375cd7b
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+++ b/js/src/tests/test262/built-ins/ShadowRealm/WrappedFunction/length.js
@@ -0,0 +1,125 @@
+// |reftest| shell-option(--enable-shadow-realms) skip-if(!xulRuntime.shell) -- requires shell-options
+// Copyright (C) 2022 Chengzhong Wu. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-wrappedfunctioncreate
+description: >
+  The value of WrappedFunction.name is copied from the target function
+info: |
+  WrappedFunctionCreate ( callerRealm: a Realm Record, Target: a function object, )
+
+  ...
+  7. Let result be CopyNameAndLength(wrapped, Target).
+  ...
+
+  CopyNameAndLength ( F: a function object, Target: a function object, prefix: a String, optional argCount: a Number, )
+
+  1. If argCount is undefined, then set argCount to 0.
+  2. Let L be 0.
+  3. Let targetHasLength be ? HasOwnProperty(Target, "length").
+  4. If targetHasLength is true, then
+    a. Let targetLen be ? Get(Target, "length").
+    b. If Type(targetLen) is Number, then
+        i. If targetLen is +∞𝔽, set L to +∞.
+        ii. Else if targetLen is -∞𝔽, set L to 0.
+        iii. Else,
+            1. Let targetLenAsInt be ! ToIntegerOrInfinity(targetLen).
+            2. Assert: targetLenAsInt is finite.
+            3. Set L to max(targetLenAsInt - argCount, 0).
+  5. Perform ! SetFunctionLength(F, L).
+  ...
+
+  SetFunctionLength ( F, length )
+
+  ...
+  2. Return ! DefinePropertyOrThrow(F, "length", PropertyDescriptor { [[Value]]: 𝔽(length), [[Writable]]: false, [[Enumerable]]: false, [[Configurable]]: true }).
+
+includes: [propertyHelper.js]
+features: [ShadowRealm]
+---*/
+
+assert.sameValue(
+  typeof ShadowRealm.prototype.evaluate,
+  'function',
+  'This test must fail if ShadowRealm.prototype.evaluate is not a function'
+);
+
+const r = new ShadowRealm();
+
+
+let wrapped = r.evaluate(`
+function fn(foo, bar) {}
+fn;
+`);
+verifyProperty(wrapped, "length", {
+  value: 2,
+  enumerable: false,
+  writable: false,
+  configurable: true,
+});
+
+
+wrapped = r.evaluate(`
+function fn() {}
+delete fn.length;
+fn;
+`);
+verifyProperty(wrapped, "length", {
+  value: 0,
+  enumerable: false,
+  writable: false,
+  configurable: true,
+});
+
+
+wrapped = r.evaluate(`
+function fn() {}
+Object.defineProperty(fn, 'length', {
+  get: () => Infinity,
+  enumerable: false,
+  configurable: true,
+});
+fn;
+`);
+verifyProperty(wrapped, "length", {
+  value: Infinity,
+  enumerable: false,
+  writable: false,
+  configurable: true,
+});
+
+
+wrapped = r.evaluate(`
+function fn() {}
+Object.defineProperty(fn, 'length', {
+  get: () => -Infinity,
+  enumerable: false,
+  configurable: true,
+});
+fn;
+`);
+verifyProperty(wrapped, "length", {
+  value: 0,
+  enumerable: false,
+  writable: false,
+  configurable: true,
+});
+
+
+wrapped = r.evaluate(`
+function fn() {}
+Object.defineProperty(fn, 'length', {
+  get: () => -1,
+  enumerable: false,
+  configurable: true,
+});
+fn;
+`);
+verifyProperty(wrapped, "length", {
+  value: 0,
+  enumerable: false,
+  writable: false,
+  configurable: true,
+});
+
+reportCompare(0, 0);