Temporal.now.timeZone: improve coverage

features.txt

@@ -335,3 +335,7 @@ json-modules
 # Resizable Arraybuffer
 # https://github.com/tc39/proposal-resizablearraybuffer
 resizable-arraybuffer
+
+# Temporal
+# https://github.com/tc39/proposal-temporal
+Temporal

test/built-ins/Temporal/now/timeZone/extensible.js

@@ -0,0 +1,15 @@
+// Copyright (C) 2021 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.now.timezone
+description: Temporal.now.timeZone is extensible.
+info: |
+  ## 17 ECMAScript Standard Built-in Objects
+
+  Unless specified otherwise, the [[Extensible]] internal slot
+  of a built-in object initially has the value true.
+features: [Temporal]
+---*/
+
+assert(Object.isExtensible(Temporal.now.timeZone));

test/built-ins/Temporal/now/timeZone/length.js

@@ -3,6 +3,7 @@
 
 /*---
 esid: sec-temporal.now.timezone
+description: Temporal.now.timeZone.length is 0
 info: |
     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
@@ -13,6 +14,7 @@ info: |
     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: [Temporal]
 ---*/
 
 verifyProperty(Temporal.now.timeZone, "length", {

test/built-ins/Temporal/now/timeZone/name.js

@@ -0,0 +1,26 @@
+// Copyright (C) 2021 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.now.timezone
+description: Temporal.now.timeZone.name is "timeZone".
+info: |
+  ## 17 ECMAScript Standard Built-in Objects:
+  Every built-in Function object, including constructors, that is not
+  identified as an anonymous function has a name property whose value is a
+  String.
+
+  Unless otherwise specified, the name property of a built-in Function object,
+  if it exists, has the attributes { [[Writable]]: false, [[Enumerable]]:
+  false, [[Configurable]]: true }.
+includes: [propertyHelper.js]
+features: [Temporal]
+---*/
+
+assert.sameValue(Temporal.now.timeZone.name, 'timeZone');
+
+verifyProperty(Temporal.now.timeZone, 'name', {
+  enumerable: false,
+  writable: false,
+  configurable: true
+});

test/built-ins/Temporal/now/timeZone/new-object.js

@@ -3,6 +3,8 @@
 
 /*---
 esid: sec-temporal.now.timezone
+description: Each invocation of the function produces a distinct object value
+features: [Temporal]
 ---*/
 
 const tz = Temporal.now.timeZone;

test/built-ins/Temporal/now/timeZone/not-a-constructor.js

@@ -0,0 +1,21 @@
+// Copyright (C) 2021 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.now.timezone
+description: Temporal.now.timeZone does not implement [[Construct]]
+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.
+includes: [isConstructor.js]
+features: [Reflect.construct, Temporal]
+---*/
+
+assert.sameValue(isConstructor(Temporal.now.timeZone), false, 'isConstructor(Temporal.now.timeZone) must return false');
+
+assert.throws(TypeError, () => {
+  new Temporal.now.timeZone();
+}, '`new Temporal.now.timeZone()` throws TypeError');

test/built-ins/Temporal/now/timeZone/prop-desc.js

@@ -0,0 +1,19 @@
+// Copyright (C) 2021 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.now.timezone
+description: The "timeZone" property of Temporal.now
+info: |
+  Section 17: Every other data property described in clauses 18 through 26
+  and in Annex B.2 has the attributes { [[Writable]]: true,
+  [[Enumerable]]: false, [[Configurable]]: true } unless otherwise specified.
+includes: [propertyHelper.js]
+features: [Temporal]
+---*/
+
+verifyProperty(Temporal.now, 'timeZone', {
+  enumerable: false,
+  writable: true,
+  configurable: true
+});

test/built-ins/Temporal/now/timeZone/return-value.js

@@ -0,0 +1,15 @@
+// Copyright (C) 2021 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.now.timezone
+description: Temporal.now.timeZone returns an instance of the TimeZone constructor
+info: |
+  1. Return ? SystemTimeZone().
+features: [Temporal]
+---*/
+
+assert.sameValue(
+  Object.getPrototypeOf(Temporal.now.timeZone()),
+  Temporal.TimeZone.prototype
+);