Adds .length property descriptor tests for explicit resource management

These are all the length.js tests from @rbuckton's PR tc39#3866 to make reviewing easier.

test/built-ins/AsyncDisposableStack/length.js

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+// Copyright (C) 2023 Ron Buckton. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-asyncdisposablestack
+description: AsyncDisposableStack.length property descriptor
+info: |
+  AsyncDisposableStack ( )
+
+  17 ECMAScript Standard Built-in Objects
+
+  Every built-in function object, including constructors, has a length
+  property whose value is an integer. Unless otherwise specified, this
+  value is equal to the largest number of named arguments shown in the
+  subclause headings for the function description. Optional parameters
+  (which are indicated with brackets: [ ]) or rest parameters (which
+  are shown using the form «...name») are not included in the default
+  argument count.
+
+  Unless otherwise specified, the length property of a built-in
+  function object has the attributes { [[Writable]]: false,
+  [[Enumerable]]: false, [[Configurable]]: true }.
+includes: [propertyHelper.js]
+features: [explicit-resource-management]
+---*/
+
+verifyProperty(AsyncDisposableStack, 'length', {
+  value: 0,
+  writable: false,
+  enumerable: false,
+  configurable: true
+});

test/built-ins/AsyncDisposableStack/prototype/adopt/length.js

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+// Copyright (C) 2023 Ron Buckton. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-asyncdisposablestack.prototype.adopt
+description: AsyncDisposableStack.prototype.adopt.length property descriptor
+info: |
+  AsyncDisposableStack.prototype.adopt ( value, onDisposeAsync )
+
+  17 ECMAScript Standard Built-in Objects
+
+  Every built-in function object, including constructors, has a length
+  property whose value is an integer. Unless otherwise specified, this
+  value is equal to the largest number of named arguments shown in the
+  subclause headings for the function description. Optional parameters
+  (which are indicated with brackets: [ ]) or rest parameters (which
+  are shown using the form «...name») are not included in the default
+  argument count.
+
+  Unless otherwise specified, the length property of a built-in
+  function object has the attributes { [[Writable]]: false,
+  [[Enumerable]]: false, [[Configurable]]: true }.
+includes: [propertyHelper.js]
+features: [explicit-resource-management]
+---*/
+
+verifyProperty(AsyncDisposableStack.prototype.adopt, 'length', {
+  value: 2,
+  writable: false,
+  enumerable: false,
+  configurable: true
+});

test/built-ins/AsyncDisposableStack/prototype/defer/length.js

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+// Copyright (C) 2023 Ron Buckton. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-asyncdisposablestack.prototype.defer
+description: AsyncDisposableStack.prototype.defer.length property descriptor
+info: |
+  AsyncDisposableStack.prototype.defer ( )
+
+  17 ECMAScript Standard Built-in Objects
+
+  Every built-in function object, including constructors, has a length
+  property whose value is an integer. Unless otherwise specified, this
+  value is equal to the largest number of named arguments shown in the
+  subclause headings for the function description. Optional parameters
+  (which are indicated with brackets: [ ]) or rest parameters (which
+  are shown using the form «...name») are not included in the default
+  argument count.
+
+  Unless otherwise specified, the length property of a built-in
+  function object has the attributes { [[Writable]]: false,
+  [[Enumerable]]: false, [[Configurable]]: true }.
+includes: [propertyHelper.js]
+features: [explicit-resource-management]
+---*/
+
+verifyProperty(AsyncDisposableStack.prototype.defer, 'length', {
+  value: 1,
+  writable: false,
+  enumerable: false,
+  configurable: true
+});

test/built-ins/AsyncDisposableStack/prototype/disposeAsync/length.js

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+// Copyright (C) 2023 Ron Buckton. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-asyncdisposablestack.prototype.disposeAsync
+description: AsyncDisposableStack.prototype.disposeAsync.length property descriptor
+info: |
+  AsyncDisposableStack.prototype.disposeAsync ( )
+
+  17 ECMAScript Standard Built-in Objects
+
+  Every built-in function object, including constructors, has a length
+  property whose value is an integer. Unless otherwise specified, this
+  value is equal to the largest number of named arguments shown in the
+  subclause headings for the function description. Optional parameters
+  (which are indicated with brackets: [ ]) or rest parameters (which
+  are shown using the form «...name») are not included in the default
+  argument count.
+
+  Unless otherwise specified, the length property of a built-in
+  function object has the attributes { [[Writable]]: false,
+  [[Enumerable]]: false, [[Configurable]]: true }.
+includes: [propertyHelper.js]
+features: [explicit-resource-management]
+---*/
+
+verifyProperty(AsyncDisposableStack.prototype.disposeAsync, 'length', {
+  value: 0,
+  writable: false,
+  enumerable: false,
+  configurable: true
+});

test/built-ins/AsyncDisposableStack/prototype/disposed/length.js

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+// Copyright (C) 2023 Ron Buckton. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-get-asyncdisposablestack.prototype.disposed
+description: >
+  Map.prototype.size.length value and descriptor.
+info: |
+  get Map.prototype.size
+
+  17 ECMAScript Standard Built-in Objects
+includes: [propertyHelper.js]
+---*/
+
+var descriptor = Object.getOwnPropertyDescriptor(Map.prototype, 'size');
+
+assert.sameValue(
+  descriptor.get.length, 0,
+  'The value of `Map.prototype.size.length` is `0`'
+);
+
+verifyNotEnumerable(descriptor.get, 'length');
+verifyNotWritable(descriptor.get, 'length');
+verifyConfigurable(descriptor.get, 'length');

test/built-ins/AsyncDisposableStack/prototype/move/length.js

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+// Copyright (C) 2023 Ron Buckton. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-asyncdisposablestack.prototype.move
+description: AsyncDisposableStack.prototype.move.length property descriptor
+info: |
+  AsyncDisposableStack.prototype.move ( )
+
+  17 ECMAScript Standard Built-in Objects
+
+  Every built-in function object, including constructors, has a length
+  property whose value is an integer. Unless otherwise specified, this
+  value is equal to the largest number of named arguments shown in the
+  subclause headings for the function description. Optional parameters
+  (which are indicated with brackets: [ ]) or rest parameters (which
+  are shown using the form «...name») are not included in the default
+  argument count.
+
+  Unless otherwise specified, the length property of a built-in
+  function object has the attributes { [[Writable]]: false,
+  [[Enumerable]]: false, [[Configurable]]: true }.
+includes: [propertyHelper.js]
+features: [explicit-resource-management]
+---*/
+
+verifyProperty(AsyncDisposableStack.prototype.move, 'length', {
+  value: 0,
+  writable: false,
+  enumerable: false,
+  configurable: true
+});

test/built-ins/AsyncDisposableStack/prototype/use/length.js

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+// Copyright (C) 2023 Ron Buckton. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-asyncdisposablestack.prototype.use
+description: AsyncDisposableStack.prototype.use.length property descriptor
+info: |
+  AsyncDisposableStack.prototype.use ( value )
+
+  17 ECMAScript Standard Built-in Objects
+
+  Every built-in function object, including constructors, has a length
+  property whose value is an integer. Unless otherwise specified, this
+  value is equal to the largest number of named arguments shown in the
+  subclause headings for the function description. Optional parameters
+  (which are indicated with brackets: [ ]) or rest parameters (which
+  are shown using the form «...name») are not included in the default
+  argument count.
+
+  Unless otherwise specified, the length property of a built-in
+  function object has the attributes { [[Writable]]: false,
+  [[Enumerable]]: false, [[Configurable]]: true }.
+includes: [propertyHelper.js]
+features: [explicit-resource-management]
+---*/
+
+verifyProperty(AsyncDisposableStack.prototype.use, 'length', {
+  value: 1,
+  writable: false,
+  enumerable: false,
+  configurable: true
+});

test/built-ins/AsyncIteratorPrototype/Symbol.asyncDispose/length.js

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+// Copyright (C) 2023 Ron Buckton. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-%asynciteratorprototype%-@@asyncDispose
+description: Length of %AsyncIteratorPrototype%[ @@asyncDispose ]
+info: |
+    ES6 Section 17:
+    Every built-in Function object, including constructors, has a length
+    property whose value is an integer. Unless otherwise specified, this value
+    is equal to the largest number of named arguments shown in the subclause
+    headings for the function description, including optional parameters.
+
+    [...]
+
+    Unless otherwise specified, the length property of a built-in Function
+    object has the attributes { [[Writable]]: false, [[Enumerable]]: false,
+    [[Configurable]]: true }.
+features: [explicit-resource-management]
+includes: [propertyHelper.js]
+---*/
+
+async function* generator() {}
+const AsyncIteratorPrototype = Object.getPrototypeOf(Object.getPrototypeOf(generator.prototype))
+
+verifyProperty(AsyncIteratorPrototype[Symbol.asyncDispose], 'length', {
+  value: 0,
+  writable: false,
+  enumerable: false,
+  configurable: true,
+});

test/built-ins/DisposableStack/length.js

@@ -0,0 +1,32 @@
+// Copyright (C) 2023 Ron Buckton. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-disposablestack
+description: DisposableStack.length property descriptor
+info: |
+  DisposableStack ( )
+
+  17 ECMAScript Standard Built-in Objects
+
+  Every built-in function object, including constructors, has a length
+  property whose value is an integer. Unless otherwise specified, this
+  value is equal to the largest number of named arguments shown in the
+  subclause headings for the function description. Optional parameters
+  (which are indicated with brackets: [ ]) or rest parameters (which
+  are shown using the form «...name») are not included in the default
+  argument count.
+
+  Unless otherwise specified, the length property of a built-in
+  function object has the attributes { [[Writable]]: false,
+  [[Enumerable]]: false, [[Configurable]]: true }.
+includes: [propertyHelper.js]
+features: [explicit-resource-management]
+---*/
+
+verifyProperty(DisposableStack, 'length', {
+  value: 0,
+  writable: false,
+  enumerable: false,
+  configurable: true
+});

test/built-ins/DisposableStack/prototype/adopt/length.js

@@ -0,0 +1,32 @@
+// Copyright (C) 2023 Ron Buckton. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-disposablestack.prototype.adopt
+description: DisposableStack.prototype.adopt.length property descriptor
+info: |
+  DisposableStack.prototype.adopt ( )
+
+  17 ECMAScript Standard Built-in Objects
+
+  Every built-in function object, including constructors, has a length
+  property whose value is an integer. Unless otherwise specified, this
+  value is equal to the largest number of named arguments shown in the
+  subclause headings for the function description. Optional parameters
+  (which are indicated with brackets: [ ]) or rest parameters (which
+  are shown using the form «...name») are not included in the default
+  argument count.
+
+  Unless otherwise specified, the length property of a built-in
+  function object has the attributes { [[Writable]]: false,
+  [[Enumerable]]: false, [[Configurable]]: true }.
+includes: [propertyHelper.js]
+features: [explicit-resource-management]
+---*/
+
+verifyProperty(DisposableStack.prototype.adopt, 'length', {
+  value: 2,
+  writable: false,
+  enumerable: false,
+  configurable: true
+});

test/built-ins/DisposableStack/prototype/defer/length.js

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+// Copyright (C) 2023 Ron Buckton. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-disposablestack.prototype.defer
+description: DisposableStack.prototype.defer.length property descriptor
+info: |
+  DisposableStack.prototype.defer ( )
+
+  17 ECMAScript Standard Built-in Objects
+
+  Every built-in function object, including constructors, has a length
+  property whose value is an integer. Unless otherwise specified, this
+  value is equal to the largest number of named arguments shown in the
+  subclause headings for the function description. Optional parameters
+  (which are indicated with brackets: [ ]) or rest parameters (which
+  are shown using the form «...name») are not included in the default
+  argument count.
+
+  Unless otherwise specified, the length property of a built-in
+  function object has the attributes { [[Writable]]: false,
+  [[Enumerable]]: false, [[Configurable]]: true }.
+includes: [propertyHelper.js]
+features: [explicit-resource-management]
+---*/
+
+verifyProperty(DisposableStack.prototype.defer, 'length', {
+  value: 1,
+  writable: false,
+  enumerable: false,
+  configurable: true
+});

test/built-ins/DisposableStack/prototype/dispose/length.js

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+// Copyright (C) 2023 Ron Buckton. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-disposablestack.prototype.dispose
+description: DisposableStack.prototype.dispose.length property descriptor
+info: |
+  DisposableStack.prototype.dispose ( )
+
+  17 ECMAScript Standard Built-in Objects
+
+  Every built-in function object, including constructors, has a length
+  property whose value is an integer. Unless otherwise specified, this
+  value is equal to the largest number of named arguments shown in the
+  subclause headings for the function description. Optional parameters
+  (which are indicated with brackets: [ ]) or rest parameters (which
+  are shown using the form «...name») are not included in the default
+  argument count.
+
+  Unless otherwise specified, the length property of a built-in
+  function object has the attributes { [[Writable]]: false,
+  [[Enumerable]]: false, [[Configurable]]: true }.
+includes: [propertyHelper.js]
+features: [explicit-resource-management]
+---*/
+
+verifyProperty(DisposableStack.prototype.dispose, 'length', {
+  value: 0,
+  writable: false,
+  enumerable: false,
+  configurable: true
+});