Add tests for Atomics.pause (#4147)

* Add tests for Atomics.pause

* Address review

Author: syg

features.txt

@@ -106,6 +106,10 @@ source-phase-imports-module-source
 # https://github.com/tc39/proposal-arraybuffer-base64
 uint8array-base64
 
+# Atomics.pause
+# https://github.com/tc39/proposal-atomics-microwait
+Atomics.pause
+
 ## Standard language features
 #
 # Language features that have been included in a published version of the

test/built-ins/Atomics/pause/descriptor.js

@@ -0,0 +1,15 @@
+// Copyright 2024 the V8 project authors. All rights reserved.
+// This code is governed by the license found in the LICENSE file.
+
+/*---
+esid: sec-atomics.pause
+description: Testing descriptor property of Atomics.pause
+includes: [propertyHelper.js]
+features: [Atomics.pause]
+---*/
+
+verifyProperty(Atomics, 'pause', {
+  enumerable: false,
+  writable: true,
+  configurable: true,
+});

test/built-ins/Atomics/pause/length.js

@@ -0,0 +1,16 @@
+// Copyright 2024 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-atomics.pause
+description: Atomics.pause.length is 0.
+includes: [propertyHelper.js]
+features: [Atomics.pause]
+---*/
+
+verifyProperty(Atomics.pause, 'length', {
+  value: 0,
+  enumerable: false,
+  writable: false,
+  configurable: true,
+});

test/built-ins/Atomics/pause/name.js

@@ -0,0 +1,16 @@
+// Copyright 2024 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-atomics.pause
+description: Atomics.pause.name is "pause".
+includes: [propertyHelper.js]
+features: [Atomics.pause]
+---*/
+
+verifyProperty(Atomics.pause, 'name', {
+  value: 'pause',
+  enumerable: false,
+  writable: false,
+  configurable: true,
+});

test/built-ins/Atomics/pause/negative-iterationnumber-throws.js

@@ -0,0 +1,19 @@
+// Copyright 2024 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-atomics.pause
+description: Atomics.pause throws on negative argument values
+features: [Atomics.pause]
+---*/
+
+const values = [
+  -1,
+  Number.MIN_SAFE_INTEGER,
+  Number.MIN_SAFE_INTEGER - 1
+];
+
+for (const v of values) {
+  assert.throws(RangeError, () => { Atomics.pause(v); },
+                `${v} is an illegal iterationNumber`);
+}

test/built-ins/Atomics/pause/non-integral-iterationnumber-throws.js

@@ -0,0 +1,32 @@
+// Copyright (C) 2024 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-atomics.pause
+description: Atomics.pause throws on non-integral Number argument values
+features: [Atomics.pause]
+---*/
+
+const values = [
+  true,
+  false,
+  null,
+  42.42,
+  -42.42,
+  NaN,
+  Infinity,
+  Symbol("foo"),
+  "bar",
+  "42",
+  /baz/,
+  42n,
+  {},
+  [],
+  function() {},
+  { valueOf() { return 42; } }
+];
+
+for (const v of values) {
+  assert.throws(TypeError, () => { Atomics.pause(v); },
+                `${v ? v.toString() : v} is an illegal iterationNumber`);
+}

test/built-ins/Atomics/pause/not-a-constructor.js

@@ -0,0 +1,28 @@
+// Copyright 2024 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-ecmascript-standard-built-in-objects
+description: Atomics.pause does not implement [[Construct]], is not new-able
+info: |
+  ECMAScript Function Objects
+
+  Built-in function objects that are not identified as constructors do not
+  implement the [[Construct]] internal method unless otherwise specified in
+  the description of a particular function.
+
+  sec-evaluatenew
+
+  ...
+  7. If IsConstructor(constructor) is false, throw a TypeError exception.
+  ...
+includes: [isConstructor.js]
+features: [Reflect.construct, Atomics.pause]
+---*/
+
+assert.sameValue(isConstructor(Atomics.pause), false, 'isConstructor(Atomics.pause) must return false');
+
+assert.throws(TypeError, () => {
+  new Atomics.pause();
+});
+

test/built-ins/Atomics/pause/returns-undefined.js

@@ -0,0 +1,24 @@
+// Copyright 2024 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-atomics.pause
+description: Atomics.pause returns undefined
+features: [Atomics.pause]
+---*/
+
+assert.sameValue(Atomics.pause(), undefined,
+                 'Atomics.pause returns undefined');
+
+const values = [
+  undefined,
+  42,
+  0,
+  -0,
+  Number.MAX_SAFE_INTEGER
+];
+
+for (const v of values) {
+  assert.sameValue(Atomics.pause(v), undefined,
+                   'Atomics.pause returns undefined');
+}