Import tests for Temporal.Now.zonedDateTime

These tests originated in the Temporal proposal repository
https://github.com/tc39/proposal-temporal

test/built-ins/Temporal/Now/zonedDateTime/calendar-temporal-object.js

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+// 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.now.zoneddatetime
+description: Fast path for converting other Temporal objects to Temporal.Calendar by reading internal slots
+info: |
+    sec-temporal.now.plaindatetime step 1:
+      1. Return ? SystemZonedDateTime(_temporalTimeZoneLike_, _calendar_).
+    sec-temporal-systemzoneddatetime step 3:
+      3. Let _calendar_ be ? ToTemporalCalendar(_calendarLike_).
+    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 result = Temporal.Now.zonedDateTime(temporalObject);
+  assert.sameValue(result.calendar, calendar, "Temporal object coerced to calendar");
+});

test/built-ins/Temporal/Now/zonedDateTime/length.js

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+// 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.now.zoneddatetime
+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.Now.zonedDateTime, "length", {
+  value: 1,
+  writable: false,
+  enumerable: false,
+  configurable: true,
+});

test/built-ins/Temporal/Now/zonedDateTime/time-zone-undefined.js

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+// 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.now.zoneddatetime
+includes: [compareArray.js]
+features: [Temporal]
+---*/
+
+const actual = [];
+const expected = [];
+
+Object.defineProperty(Temporal.TimeZone, "from", {
+  get() {
+    actual.push("get Temporal.TimeZone.from");
+    return undefined;
+  },
+});
+
+const systemTimeZone = Temporal.Now.timeZone();
+
+const resultExplicit = Temporal.Now.zonedDateTime('iso8601', undefined);
+assert.sameValue(resultExplicit.timeZone.id, systemTimeZone.id);
+
+assert.compareArray(actual, expected, "Temporal.TimeZone.from should not be called");
+
+const resultImplicit = Temporal.Now.zonedDateTime('iso8601');
+assert.sameValue(resultImplicit.timeZone.id, systemTimeZone.id);
+
+assert.compareArray(actual, expected, "Temporal.TimeZone.from should not be called");

test/built-ins/Temporal/Now/zonedDateTime/timezone-string-datetime.js

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+// 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.now.zoneddatetime
+description: Conversion of ISO date-time strings to Temporal.TimeZone instances
+features: [Temporal]
+---*/
+
+let timeZone = "2021-08-19T17:30";
+assert.throws(RangeError, () => Temporal.Now.zonedDateTime("iso8601", timeZone), "bare date-time string is not a time zone");
+assert.throws(RangeError, () => Temporal.Now.zonedDateTime("iso8601", { timeZone }), "bare date-time string is not a time zone");
+
+timeZone = "2021-08-19T17:30Z";
+const result1 = Temporal.Now.zonedDateTime("iso8601", timeZone);
+assert.sameValue(result1.timeZone.id, "UTC", "date-time + Z is UTC time zone");
+const result2 = Temporal.Now.zonedDateTime("iso8601", { timeZone });
+assert.sameValue(result2.timeZone.id, "UTC", "date-time + Z is UTC time zone (string in property bag)");
+
+timeZone = "2021-08-19T17:30-07:00";
+const result3 = Temporal.Now.zonedDateTime("iso8601", timeZone);
+assert.sameValue(result3.timeZone.id, "-07:00", "date-time + offset is the offset time zone");
+const result4 = Temporal.Now.zonedDateTime("iso8601", { timeZone });
+assert.sameValue(result4.timeZone.id, "-07:00", "date-time + offset is the offset time zone (string in property bag)");
+
+timeZone = "2021-08-19T17:30[America/Vancouver]";
+const result5 = Temporal.Now.zonedDateTime("iso8601", timeZone);
+assert.sameValue(result5.timeZone.id, "America/Vancouver", "date-time + IANA annotation is the IANA time zone");
+const result6 = Temporal.Now.zonedDateTime("iso8601", { timeZone });
+assert.sameValue(result6.timeZone.id, "America/Vancouver", "date-time + IANA annotation is the IANA time zone (string in property bag)");
+
+timeZone = "2021-08-19T17:30Z[America/Vancouver]";
+const result7 = Temporal.Now.zonedDateTime("iso8601", timeZone);
+assert.sameValue(result7.timeZone.id, "America/Vancouver", "date-time + Z + IANA annotation is the IANA time zone");
+const result8 = Temporal.Now.zonedDateTime("iso8601", { timeZone });
+assert.sameValue(result8.timeZone.id, "America/Vancouver", "date-time + Z + IANA annotation is the IANA time zone (string in property bag)");
+
+timeZone = "2021-08-19T17:30-07:00[America/Vancouver]";
+const result9 = Temporal.Now.zonedDateTime("iso8601", timeZone);
+assert.sameValue(result9.timeZone.id, "America/Vancouver", "date-time + offset + IANA annotation is the IANA time zone");
+const result10 = Temporal.Now.zonedDateTime("iso8601", { timeZone });
+assert.sameValue(result10.timeZone.id, "America/Vancouver", "date-time + offset + IANA annotation is the IANA time zone (string in property bag)");