Add tests for Temporal.Calendar.prototype.(year|month*|day)

test/built-ins/Temporal/Calendar/prototype/day/simple.js

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+// 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.calendar.prototype.day
+description: Temporal.Calendar.prototype.day will take different kind of objects.
+  and return the value of the day.
+info: |
+  1. Let calendar be the this value.
+  2. Perform ? RequireInternalSlot(calendar, [[InitializedTemporalCalendar]]).
+  3. Assert: calendar.[[Identifier]] is "iso8601".
+  4. If Type(temporalDateLike) is not Object or temporalDateLike does not have an [[InitializedTemporalDate]] or [[InitializedTemporalMonthDay]] internal slot, then
+  a. Set temporalDateLike to ? ToTemporalDate(temporalDateLike).
+  5. Return ! ISODay(temporalDateLike).
+features: [Temporal]
+---*/
+let cal = new Temporal.Calendar("iso8601");
+
+assert.sameValue(15, cal.day(new Temporal.PlainDate(2021, 7, 15)));
+assert.sameValue(23, cal.day(new Temporal.PlainDateTime(1997, 8, 23, 5, 30, 13)));
+assert.sameValue(6, cal.day(new Temporal.PlainMonthDay(2, 6)));
+assert.sameValue(18, cal.day("2019-03-18"));

test/built-ins/Temporal/Calendar/prototype/month-code/simple.js

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+// 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.calendar.prototype.monthcode
+description: Temporal.Calendar.prototype.monthCode will take different kind of object and return
+  the value of the monthCode.
+info: |
+  1. Let calendar be the this value.
+  2. Perform ? RequireInternalSlot(calendar, [[InitializedTemporalCalendar]]).
+  3. Assert: calendar.[[Identifier]] is "iso8601".
+  4. If Type(temporalDateLike) is not Object or temporalDateLike does not have an [[InitializedTemporalDate]], [[InitializedTemporalMonthDay]], or [[InitializedTemporalYearMonth]] internal slot, then
+  a. Set temporalDateLike to ? ToTemporalDate(temporalDateLike).
+  5. Return ! ISOMonthCode(temporalDateLike).
+features: [Temporal]
+---*/
+let cal = new Temporal.Calendar("iso8601");
+
+assert.sameValue("M07", cal.monthCode(new Temporal.PlainDate(2021, 7, 15)));
+assert.sameValue("M08", cal.monthCode(new Temporal.PlainDateTime(1997, 8, 23, 5, 30, 13)));
+assert.sameValue("M06", cal.monthCode(new Temporal.PlainYearMonth(1999, 6)));
+assert.sameValue("M02", cal.monthCode(new Temporal.PlainMonthDay(2, 6)));
+assert.sameValue("M03", cal.monthCode("2019-03-15"));

test/built-ins/Temporal/Calendar/prototype/month/simple.js

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+// 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.calendar.prototype.month
+description: Temporal.Calendar.prototype.month will take different kind of object and
+  return month value.
+info: |
+  1. Let calendar be the this value.
+  2. Perform ? RequireInternalSlot(calendar, [[InitializedTemporalCalendar]]).
+  3. Assert: calendar.[[Identifier]] is "iso8601".
+  4. If Type(temporalDateLike) is Object and temporalDateLike has an [[InitializedTemporalMonthDay]] internal slot, then
+  a. Throw a TypeError exception.
+  5. If Type(temporalDateLike) is not Object or temporalDateLike does not have an [[InitializedTemporalDate]] or [[InitializedTemporalYearMonth]] internal slot, then
+  a. Set temporalDateLike to ? ToTemporalDate(temporalDateLike).
+  6. Return ! ISOMonth(temporalDateLike).
+features: [Temporal]
+---*/
+let cal = new Temporal.Calendar("iso8601");
+
+assert.sameValue(7, cal.month(new Temporal.PlainDate(2021, 7, 15)));
+assert.sameValue(8, cal.month(new Temporal.PlainDateTime(1997, 8, 23, 5, 30, 13)));
+assert.sameValue(6, cal.month(new Temporal.PlainYearMonth(1999, 6)));
+assert.sameValue(3, cal.month("2019-03-15"));

test/built-ins/Temporal/Calendar/prototype/month/throws-type-error.js

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+// 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.calendar.prototype.month
+description: Temporal.Calendar.prototype.month will throws TypeError while the input object
+  has an [[InitializedTemporalMonthDay]] internal slot.
+info: |
+  1. Let calendar be the this value.
+  2. Perform ? RequireInternalSlot(calendar, [[InitializedTemporalCalendar]]).
+  3. Assert: calendar.[[Identifier]] is "iso8601".
+  4. If Type(temporalDateLike) is Object and temporalDateLike has an [[InitializedTemporalMonthDay]] internal slot, then
+  a. Throw a TypeError exception.
+  5. If Type(temporalDateLike) is not Object or temporalDateLike does not have an [[InitializedTemporalDate]] or [[InitializedTemporalYearMonth]] internal slot, then
+  a. Set temporalDateLike to ? ToTemporalDate(temporalDateLike).
+  6. Return ! ISOMonth(temporalDateLike).
+features: [Temporal]
+---*/
+let cal = new Temporal.Calendar("iso8601");
+
+assert.throws(TypeError, () => cal.month(new Temporal.PlainMonthDay(3, 16)),
+    "invalid_argument");

test/built-ins/Temporal/Calendar/prototype/year/simple.js

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+// 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.calendar.prototype.year
+description: Temporal.Calendar.prototype.year will take different kind of object and return 
+  the value of the year.
+info: |
+  1. Let calendar be the this value.
+  2. Perform ? RequireInternalSlot(calendar, [[InitializedTemporalCalendar]]).
+  3. Assert: calendar.[[Identifier]] is "iso8601".
+  4. If Type(temporalDateLike) is not Object or temporalDateLike does not have an [[InitializedTemporalDate]] or [[InitializedTemporalYearMonth]] internal slot, then
+  a. Set temporalDateLike to ? ToTemporalDate(temporalDateLike).
+  5. Return ! ISOYear(temporalDateLike).
+features: [Temporal]
+---*/
+let cal = new Temporal.Calendar("iso8601");
+
+assert.sameValue(2021, cal.year(new Temporal.PlainDate(2021, 7, 15)));
+assert.sameValue(1997, cal.year(new Temporal.PlainDateTime(1997, 8, 23, 5, 30, 13)));
+assert.sameValue(1999, cal.year(new Temporal.PlainYearMonth(1999, 6)));
+assert.sameValue(2019, cal.year("2019-03-15"));