Bug 1966355 - Part 21: Import Immutable ArrayBuffer test262 tests. r=spidermonkey-reviewers,dminor

Test262 PR: <tc39/test262#4445>.

Roughly half of the spec proposal is still missing coverage, see the review
notes at <tc39/test262#4445 (review)>.

Differential Revision: https://phabricator.services.mozilla.com/D249415

Author: anba

js/src/tests/test262/prs/4445/browser.js

@@ -0,0 +1,26 @@
+// |reftest| shell-option(--enable-arraybuffer-immutable) skip-if(!ArrayBuffer.prototype.sliceToImmutable||!xulRuntime.shell) -- immutable-arraybuffer is not enabled unconditionally, requires shell-options
+// Copyright (C) 2025 Moddable Tech, Inc. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+description: verify immutable property of ArrayBuffer
+esid: sec-get-arraybuffer.prototype.immutable
+features: [ArrayBuffer, immutable-arraybuffer]
+---*/
+
+var ab = new ArrayBuffer(1);
+
+assert.sameValue(ab.immutable, false);
+
+ab = ab.transferToImmutable();
+
+assert.sameValue(ab.immutable, true);
+
+ab = new ArrayBuffer(1, { maxByteLength: 2 });
+
+assert.sameValue(ab.immutable, false);
+
+ab = ab.transferToImmutable();
+
+assert.sameValue(ab.immutable, true);
+
+reportCompare(0, 0);

js/src/tests/test262/prs/4445/built-ins/ArrayBuffer/browser.js

@@ -0,0 +1,14 @@
+// |reftest| shell-option(--enable-arraybuffer-immutable) skip-if(!ArrayBuffer.prototype.sliceToImmutable||!xulRuntime.shell) -- immutable-arraybuffer is not enabled unconditionally, requires shell-options
+// Copyright (C) 2025 Moddable Tech, Inc. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+description: verify immutable property requires ArrayBuffer receiver
+esid: sec-get-arraybuffer.prototype.immutable
+features: [ArrayBuffer, immutable-arraybuffer]
+---*/
+
+assert.throws(TypeError, function() {
+  ArrayBuffer.prototype.immutable;
+});
+
+reportCompare(0, 0);

js/src/tests/test262/prs/4445/built-ins/ArrayBuffer/prototype/browser.js

@@ -0,0 +1,20 @@
+// |reftest| shell-option(--enable-arraybuffer-immutable) skip-if(!ArrayBuffer.prototype.sliceToImmutable||!xulRuntime.shell) -- immutable-arraybuffer is not enabled unconditionally, requires shell-options
+// Copyright (C) 2025 Moddable Tech, Inc. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+description: verify immutable property is implemented by an accessor
+esid: sec-get-arraybuffer.prototype.immutable
+features: [ArrayBuffer, immutable-arraybuffer]
+---*/
+
+var getter = Object.getOwnPropertyDescriptor(
+  ArrayBuffer.prototype, 'immutable'
+).get;
+
+assert.sameValue(typeof getter, 'function');
+
+assert.throws(TypeError, function() {
+  getter();
+});
+
+reportCompare(0, 0);

js/src/tests/test262/prs/4445/built-ins/ArrayBuffer/prototype/immutable/browser.js

@@ -0,0 +1,20 @@
+// |reftest| shell-option(--enable-arraybuffer-immutable) skip-if(!ArrayBuffer.prototype.sliceToImmutable||!xulRuntime.shell) -- immutable-arraybuffer is not enabled unconditionally, requires shell-options
+// Copyright (C) 2025 Moddable Tech, Inc. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+description: verify immutable getter's length property attributes and value
+esid: sec-get-arraybuffer.prototype.immutable
+includes: [propertyHelper.js]
+features: [ArrayBuffer, immutable-arraybuffer]
+---*/
+
+var desc = Object.getOwnPropertyDescriptor(ArrayBuffer.prototype, 'immutable');
+
+verifyProperty(desc.get, 'length', {
+  value: 0,
+  enumerable: false,
+  writable: false,
+  configurable: true
+});
+
+reportCompare(0, 0);

js/src/tests/test262/prs/4445/built-ins/ArrayBuffer/prototype/immutable/immutable-buffer.js

@@ -0,0 +1,20 @@
+// |reftest| shell-option(--enable-arraybuffer-immutable) skip-if(!ArrayBuffer.prototype.sliceToImmutable||!xulRuntime.shell) -- immutable-arraybuffer is not enabled unconditionally, requires shell-options
+// Copyright (C) 2025 Moddable Tech, Inc. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+description: verify immutable getter's name property attributes and value
+esid: sec-get-arraybuffer.prototype.immutable
+includes: [propertyHelper.js]
+features: [ArrayBuffer, immutable-arraybuffer]
+---*/
+
+var desc = Object.getOwnPropertyDescriptor(ArrayBuffer.prototype, 'immutable');
+
+verifyProperty(desc.get, 'name', {
+  value: 'get immutable',
+  enumerable: false,
+  writable: false,
+  configurable: true
+});
+
+reportCompare(0, 0);

js/src/tests/test262/prs/4445/built-ins/ArrayBuffer/prototype/immutable/invoked-as-accessor.js

@@ -0,0 +1,21 @@
+// |reftest| shell-option(--enable-arraybuffer-immutable) skip-if(!ArrayBuffer.prototype.sliceToImmutable||!xulRuntime.shell) -- immutable-arraybuffer is not enabled unconditionally, requires shell-options
+// Copyright (C) 2025 Moddable Tech, Inc. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+description: immutable property has no setter
+esid: sec-get-arraybuffer.prototype.immutable
+includes: [propertyHelper.js]
+features: [ArrayBuffer, immutable-arraybuffer]
+---*/
+
+var desc = Object.getOwnPropertyDescriptor(ArrayBuffer.prototype, 'immutable');
+
+assert.sameValue(desc.set, undefined);
+assert.sameValue(typeof desc.get, 'function');
+
+verifyProperty(ArrayBuffer.prototype, 'immutable', {
+  enumerable: false,
+  configurable: true
+});
+
+reportCompare(0, 0);