Add Temporal tests

This copies over the tests that previously existed in the
tc39/proposal-temporal repository.

For context, see thread starting at:
tc39#3002 (comment)

In service of tc39#3002

Author: ptomato

harness/temporalHelpers.js

@@ -0,0 +1,27 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.calendar
+description: Tests that Temporal.Calendar meets the requirements for built-in objects
+info: |
+    Unless specified otherwise, a built-in object that is callable as a function is a built-in
+    function object with the characteristics described in 10.3. Unless specified otherwise, the
+    [[Extensible]] internal slot of a built-in object initially has the value true.
+
+    Unless otherwise specified every built-in function and every built-in constructor has the
+    Function prototype object [...] as the value of its [[Prototype]] internal slot.
+features: [Temporal]
+---*/
+
+assert.sameValue(Object.isExtensible(Temporal.Calendar),
+  true, "Built-in objects must be extensible.");
+
+assert.sameValue(Object.prototype.toString.call(Temporal.Calendar),
+  "[object Function]", "Object.prototype.toString");
+
+assert.sameValue(Object.getPrototypeOf(Temporal.Calendar),
+  Function.prototype, "prototype");
+
+assert.sameValue(typeof Temporal.Calendar.prototype,
+  "object", "prototype property");

test/built-ins/Temporal/Calendar/builtin.js

@@ -0,0 +1,12 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.calendar
+description: Temporal.Calendar constructor cannot be called as a function
+info: |
+    1. If NewTarget is undefined, throw a TypeError exception.
+features: [Temporal]
+---*/
+
+assert.throws(TypeError, () => Temporal.Calendar());

test/built-ins/Temporal/Calendar/constructor.js

@@ -0,0 +1,30 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.calendar.from
+description: Tests that Temporal.Calendar.from meets the requirements for built-in objects
+info: |
+    Built-in functions that are not constructors do not have a "prototype" property unless
+    otherwise specified in the description of a particular function.
+
+    Unless specified otherwise, a built-in object that is callable as a function is a built-in
+    function object with the characteristics described in 10.3. Unless specified otherwise, the
+    [[Extensible]] internal slot of a built-in object initially has the value true.
+
+    Unless otherwise specified every built-in function and every built-in constructor has the
+    Function prototype object [...] as the value of its [[Prototype]] internal slot.
+features: [Temporal]
+---*/
+
+assert.sameValue(Object.isExtensible(Temporal.Calendar.from),
+  true, "Built-in objects must be extensible.");
+
+assert.sameValue(Object.prototype.toString.call(Temporal.Calendar.from),
+  "[object Function]", "Object.prototype.toString");
+
+assert.sameValue(Object.getPrototypeOf(Temporal.Calendar.from),
+  Function.prototype, "prototype");
+
+assert.sameValue(Temporal.Calendar.from.hasOwnProperty("prototype"),
+  false, "prototype property");

test/built-ins/Temporal/Calendar/from/builtin.js

@@ -0,0 +1,11 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.calendar.from
+description: Converting objects to Temporal.Calendar
+features: [Temporal]
+---*/
+
+assert.throws(RangeError, () => Temporal.Calendar.from({ calendar: "local" }));
+assert.throws(RangeError, () => Temporal.Calendar.from({ calendar: { calendar: "iso8601" } }));

test/built-ins/Temporal/Calendar/from/calendar-object-invalid.js

@@ -0,0 +1,39 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.calendar.from
+description: Converting objects to Temporal.Calendar
+includes: [compareArray.js, temporalHelpers.js]
+features: [Temporal]
+---*/
+
+const expected = [
+  "has outer.calendar",
+  "get outer.calendar",
+  "has inner.calendar",
+  "get inner.toString",
+  "call inner.toString",
+];
+const actual = [];
+const calendar = new Proxy({}, {
+  has(t, p) {
+    actual.push(`has outer.${p}`);
+    return true;
+  },
+  get(t, p) {
+    actual.push(`get outer.${p}`);
+    return new Proxy(TemporalHelpers.toPrimitiveObserver(actual, "iso8601", "inner"), {
+      has(t, p) {
+        actual.push(`has inner.${p}`);
+        return true;
+      },
+      get(t, p) {
+        return t[p];
+      },
+    });
+  },
+});
+const result = Temporal.Calendar.from(calendar);
+assert.sameValue(result.id, "iso8601");
+assert.compareArray(actual, expected);

test/built-ins/Temporal/Calendar/from/calendar-object-operations.js

@@ -0,0 +1,21 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.calendar.from
+description: Converting objects to Temporal.Calendar
+features: [Temporal]
+---*/
+
+const cal = new Temporal.Calendar("iso8601");
+const calFromObject = Temporal.Calendar.from({ calendar: cal });
+assert(calFromObject instanceof Temporal.Calendar);
+assert.sameValue(calFromObject.id, "iso8601");
+
+const calFromString = Temporal.Calendar.from({ calendar: "iso8601" });
+assert(calFromString instanceof Temporal.Calendar);
+assert.sameValue(calFromString.id, "iso8601");
+
+const custom = { id: "custom-calendar" };
+assert.sameValue(Temporal.Calendar.from({ calendar: custom }), custom);
+assert.sameValue(Temporal.Calendar.from(custom), custom);

test/built-ins/Temporal/Calendar/from/calendar-object.js

@@ -0,0 +1,19 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.calendar.from
+description: Calendar.from should support iso8601.
+features: [Temporal]
+---*/
+
+const tests = [
+  "iso8601",
+  "1994-11-05T08:15:30-05:00",
+];
+
+for (const item of tests) {
+  const calendar = Temporal.Calendar.from(item);
+  assert(calendar instanceof Temporal.Calendar);
+  assert.sameValue(calendar.id, "iso8601");
+}

test/built-ins/Temporal/Calendar/from/calendar-string-builtin.js

@@ -0,0 +1,19 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.calendar.from
+description: from() throws if the argument is not a built-in calendar name.
+features: [Temporal]
+---*/
+
+const tests = [
+  "local",
+  "iso-8601",
+  "[u-ca=iso8601]",
+  "invalid-calendar",
+];
+
+for (const item of tests) {
+  assert.throws(RangeError, () => Temporal.Calendar.from(item));
+}

test/built-ins/Temporal/Calendar/from/calendar-string-not-builtin.js

@@ -0,0 +1,20 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.calendar.from
+description: Fast path for converting other Temporal objects to Temporal.Calendar by reading internal slots
+info: |
+    sec-temporal.calendar.from step 1:
+      1. Return ? ToTemporalCalendar(_item_).
+    sec-temporal-totemporalcalendar step 1.a:
+      a. If _temporalCalendarLike_ has an [[InitializedTemporalDate]], [[InitializedTemporalDateTime]], [[InitializedTemporalMonthDay]], [[InitializedTemporalYearMonth]], or [[InitializedTemporalZonedDateTime]] internal slot, then
+        i. Return _temporalCalendarLike_.[[Calendar]].
+includes: [compareArray.js, temporalHelpers.js]
+features: [Temporal]
+---*/
+
+TemporalHelpers.checkToTemporalCalendarFastPath((temporalObject, calendar) => {
+  const newCalendar = Temporal.Calendar.from(temporalObject);
+  assert.sameValue(newCalendar, calendar, "calendar object retrieved from internal slot");
+});

test/built-ins/Temporal/Calendar/from/calendar-temporal-object.js

@@ -0,0 +1,25 @@
+// Copyright (C) 2020 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.calendar.from
+description: Temporal.Calendar.from.length is 1
+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
+    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: [Temporal]
+---*/
+
+verifyProperty(Temporal.Calendar.from, "length", {
+  value: 1,
+  writable: false,
+  enumerable: false,
+  configurable: true,
+});

test/built-ins/Temporal/Calendar/from/length.js

@@ -0,0 +1,23 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.calendar.from
+description: Temporal.Calendar.from.name is "from"
+info: |
+    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, this value
+    is the name that is given to the function in this specification.
+
+    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]
+---*/
+
+verifyProperty(Temporal.Calendar.from, "name", {
+  value: "from",
+  writable: false,
+  enumerable: false,
+  configurable: true,
+});

test/built-ins/Temporal/Calendar/from/name.js

@@ -0,0 +1,20 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.calendar.from
+description: Temporal.Calendar.from does not implement [[Construct]], is not new-able
+info: |
+    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.throws(TypeError, () => {
+  new Temporal.Calendar.from();
+}, "Calling as constructor");
+
+assert.sameValue(isConstructor(Temporal.Calendar.from), false,
+  "isConstructor(Temporal.Calendar.from)");

test/built-ins/Temporal/Calendar/from/not-a-constructor.js

@@ -0,0 +1,21 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.calendar.from
+description: The "from" property of Temporal.Calendar
+includes: [propertyHelper.js]
+features: [Temporal]
+---*/
+
+assert.sameValue(
+  typeof Temporal.Calendar.from,
+  "function",
+  "`typeof Calendar.from` is `function`"
+);
+
+verifyProperty(Temporal.Calendar, "from", {
+  writable: true,
+  enumerable: false,
+  configurable: true,
+});

test/built-ins/Temporal/Calendar/from/prop-desc.js

@@ -0,0 +1,19 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.calendar.from
+description: The receiver is never called when calling from()
+includes: [temporalHelpers.js]
+features: [Temporal]
+---*/
+
+TemporalHelpers.checkSubclassingIgnoredStatic(
+  Temporal.Calendar,
+  "from",
+  ["iso8601"],
+  (result) => {
+    assert.sameValue(result.id, "iso8601", "id property of result");
+    assert.sameValue(result.toString(), "iso8601", "toString() of result");
+  },
+);

test/built-ins/Temporal/Calendar/from/subclassing-ignored.js

@@ -0,0 +1,25 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.calendar
+description: Temporal.Calendar.length is 1
+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
+    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: [Temporal]
+---*/
+
+verifyProperty(Temporal.Calendar, "length", {
+  value: 1,
+  writable: false,
+  enumerable: false,
+  configurable: true,
+});

test/built-ins/Temporal/Calendar/length.js

@@ -0,0 +1,11 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.calendar
+description: RangeError thrown when constructor invoked with no argument
+features: [Temporal]
+---*/
+
+assert.throws(RangeError, () => new Temporal.Calendar());
+assert.throws(RangeError, () => new Temporal.Calendar(undefined));

test/built-ins/Temporal/Calendar/missing-arguments.js

@@ -0,0 +1,23 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.calendar
+description: Temporal.Calendar.name is "Calendar"
+info: |
+    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, this value
+    is the name that is given to the function in this specification.
+
+    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]
+---*/
+
+verifyProperty(Temporal.Calendar, "name", {
+  value: "Calendar",
+  writable: false,
+  enumerable: false,
+  configurable: true,
+});