Add Array.prototype.shift() tests

test/built-ins/Array/prototype/shift/set-length-array-is-frozen.js

@@ -0,0 +1,43 @@
+// Copyright (C) 2022 Apple Inc. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-array.prototype.shift
+description: >
+  A TypeError is thrown when "length" is [[Set]] on a frozen array.
+info: |
+  Array.prototype.shift ( )
+
+  [...]
+  4. Let first be ? Get(O, "0").
+  [...]
+  8. Perform ? Set(O, "length", 𝔽(len - 1), true).
+
+  OrdinarySetWithOwnDescriptor ( O, P, V, Receiver, ownDesc )
+
+  [...]
+  2. If IsDataDescriptor(ownDesc) is true, then
+    a. If ownDesc.[[Writable]] is false, return false.
+
+  Set ( O, P, V, Throw )
+
+  [...]
+  1. Let success be ? O.[[Set]](P, V, O).
+  2. If success is false and Throw is true, throw a TypeError exception.
+---*/
+
+var array = new Array(1);
+var arrayPrototypeGet0Calls = 0;
+
+Object.defineProperty(Array.prototype, "0", {
+  get() {
+    Object.freeze(array);
+    arrayPrototypeGet0Calls++;
+  },
+});
+
+assert.throws(TypeError, function() {
+  array.shift();
+});
+
+assert.sameValue(array.length, 1);
+assert.sameValue(arrayPrototypeGet0Calls, 1);

test/built-ins/Array/prototype/shift/set-length-array-length-is-non-writable.js

@@ -0,0 +1,43 @@
+// Copyright (C) 2022 Apple Inc. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-array.prototype.shift
+description: >
+  A TypeError is thrown when "length" is [[Set]] on an array with non-writable "length".
+info: |
+  Array.prototype.shift ( )
+
+  [...]
+  4. Let first be ? Get(O, "0").
+  [...]
+  8. Perform ? Set(O, "length", 𝔽(len - 1), true).
+
+  OrdinarySetWithOwnDescriptor ( O, P, V, Receiver, ownDesc )
+
+  [...]
+  2. If IsDataDescriptor(ownDesc) is true, then
+    a. If ownDesc.[[Writable]] is false, return false.
+
+  Set ( O, P, V, Throw )
+
+  [...]
+  1. Let success be ? O.[[Set]](P, V, O).
+  2. If success is false and Throw is true, throw a TypeError exception.
+---*/
+
+var array = new Array(1);
+var arrayPrototypeGet0Calls = 0;
+
+Object.defineProperty(Array.prototype, "0", {
+  get() {
+    Object.defineProperty(array, "length", { writable: false });
+    arrayPrototypeGet0Calls++;
+  },
+});
+
+assert.throws(TypeError, function() {
+  array.shift();
+});
+
+assert.sameValue(array.length, 1);
+assert.sameValue(arrayPrototypeGet0Calls, 1);

test/built-ins/Array/prototype/shift/set-length-zero-array-is-frozen.js

@@ -0,0 +1,32 @@
+// Copyright (C) 2022 Apple Inc. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-array.prototype.shift
+description: >
+  A TypeError is thrown when "length" is [[Set]] on an empty frozen array.
+info: |
+  Array.prototype.shift ( )
+
+  [...]
+  3. If len = 0, then
+    a. Perform ? Set(O, "length", +0𝔽, true).
+
+  OrdinarySetWithOwnDescriptor ( O, P, V, Receiver, ownDesc )
+
+  [...]
+  2. If IsDataDescriptor(ownDesc) is true, then
+    a. If ownDesc.[[Writable]] is false, return false.
+
+  Set ( O, P, V, Throw )
+
+  [...]
+  1. Let success be ? O.[[Set]](P, V, O).
+  2. If success is false and Throw is true, throw a TypeError exception.
+---*/
+
+var array = [];
+Object.freeze(array);
+
+assert.throws(TypeError, function() {
+  array.shift();
+});

test/built-ins/Array/prototype/shift/set-length-zero-array-length-is-non-writable.js

@@ -0,0 +1,32 @@
+// Copyright (C) 2022 Apple Inc. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-array.prototype.shift
+description: >
+  A TypeError is thrown when "length" is [[Set]] on an empty array with non-writable "length".
+info: |
+  Array.prototype.shift ( )
+
+  [...]
+  3. If len = 0, then
+    a. Perform ? Set(O, "length", +0𝔽, true).
+
+  OrdinarySetWithOwnDescriptor ( O, P, V, Receiver, ownDesc )
+
+  [...]
+  2. If IsDataDescriptor(ownDesc) is true, then
+    a. If ownDesc.[[Writable]] is false, return false.
+
+  Set ( O, P, V, Throw )
+
+  [...]
+  1. Let success be ? O.[[Set]](P, V, O).
+  2. If success is false and Throw is true, throw a TypeError exception.
+---*/
+
+var array = [];
+Object.defineProperty(array, "length", { writable: false });
+
+assert.throws(TypeError, function() {
+  array.shift();
+});