Test Array's toString() with non-callable "join" (#2973)

* Test Array's toString() with non-callable "join"

* Remove Array.prototype.join modifications

test/built-ins/Array/prototype/toString/non-callable-join-string-tag.js

@@ -0,0 +1,67 @@
+// Copyright (C) 2021 Alexey Shvayka. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-array.prototype.tostring
+description: >
+    If "join" value is non-callable, Object.prototype.toString intrinsic is called.
+info: |
+    Array.prototype.toString ( )
+
+    [...]
+    2. Let func be ? Get(array, "join").
+    3. If IsCallable(func) is false, set func to the intrinsic function %Object.prototype.toString%.
+    4. Return ? Call(func, array).
+features: [Symbol.toStringTag, Proxy, Reflect, BigInt]
+---*/
+
+assert(delete Object.prototype.toString);
+
+assert.sameValue(Array.prototype.toString.call({ join: null }), "[object Object]");
+assert.sameValue(Array.prototype.toString.call({ join: true }), "[object Object]");
+assert.sameValue(Array.prototype.toString.call({ join: 0 }), "[object Object]");
+assert.sameValue(Array.prototype.toString.call({ join: "join" }), "[object Object]");
+assert.sameValue(Array.prototype.toString.call({ join: Symbol() }), "[object Object]");
+assert.sameValue(Array.prototype.toString.call({ join: 0n }), "[object Object]");
+assert.sameValue(Array.prototype.toString.call({ join: {} }), "[object Object]");
+
+let revokeOnGet = false;
+const proxyTarget = [];
+const { proxy, revoke } = Proxy.revocable(proxyTarget, {
+    get: (target, key, receiver) => {
+        if (revokeOnGet)
+            revoke();
+        return Reflect.get(target, key, receiver);
+    },
+});
+
+proxyTarget.join = undefined;
+assert.sameValue(Array.prototype.toString.call(proxy), "[object Array]");
+revokeOnGet = true;
+assert.throws(TypeError, () => { Array.prototype.toString.call(proxy); });
+
+assert.sameValue(Array.prototype.toString.call((function() { return arguments; })()), "[object Arguments]");
+assert.sameValue(Array.prototype.toString.call(new Error), "[object Error]");
+assert.sameValue(Array.prototype.toString.call(new Boolean), "[object Boolean]");
+assert.sameValue(Array.prototype.toString.call(new Number), "[object Number]");
+assert.sameValue(Array.prototype.toString.call(new String), "[object String]");
+assert.sameValue(Array.prototype.toString.call(new Date), "[object Date]");
+assert.sameValue(Array.prototype.toString.call(new RegExp), "[object RegExp]");
+assert.sameValue(Array.prototype.toString.call(new Proxy(() => {}, {})), "[object Function]");
+assert.sameValue(Array.prototype.toString.call(new Proxy(new Date, {})), "[object Object]");
+assert.sameValue(Array.prototype.toString.call({ [Symbol.toStringTag]: "Foo" }), "[object Foo]");
+assert.sameValue(Array.prototype.toString.call(new Map), "[object Map]");
+
+RegExp.prototype[Symbol.toStringTag] = "Foo";
+assert.sameValue(Array.prototype.toString.call(new RegExp), "[object Foo]");
+Number.prototype[Symbol.toStringTag] = Object("Foo"); // ignored
+assert.sameValue(Array.prototype.toString.call(new Number), "[object Number]");
+
+Object.defineProperty(JSON, Symbol.toStringTag, { value: "Foo" });
+assert.sameValue(Array.prototype.toString.call(JSON), "[object Foo]");
+
+assert(delete Set.prototype[Symbol.toStringTag]);
+assert.sameValue(Array.prototype.toString.call(new Set), "[object Object]");
+
+Object.defineProperty(Object.prototype, Symbol.toStringTag, { get: () => { throw new Test262Error(); } });
+assert.throws(Test262Error, () => { Array.prototype.toString.call({}); });