Temporal: Test that "islamic" and "islamic-rgsa" calendars are unsupported

And remove the equivalent staging tests.

test/intl402/Temporal/PlainDate/from/islamic-rgsa.js

@@ -0,0 +1,15 @@
+// Copyright (C) 2025 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plaindate.prototype.from
+description: "islamic-rgsa" calendar name is not supported
+features: [Temporal, Intl.Era-monthcode]
+---*/
+
+const calendar = "islamic-rgsa";
+
+assert.throws(RangeError, () =>
+  Temporal.PlainDate.from({year: 1500, month: 1, day: 1, calendar}),
+  "fallback for calendar ID 'islamic-rgsa' only supported in Intl.DateTimeFormat constructor, not Temporal"
+);

test/intl402/Temporal/PlainDate/from/islamic.js

@@ -0,0 +1,15 @@
+// Copyright (C) 2025 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plaindate.prototype.from
+description: "islamic" calendar name is not supported
+features: [Temporal, Intl.Era-monthcode]
+---*/
+
+const calendar = "islamic";
+
+assert.throws(RangeError, () =>
+  Temporal.PlainDate.from({year: 1500, month: 1, day: 1, calendar}),
+  "fallback for calendar ID 'islamic' only supported in Intl.DateTimeFormat constructor, not Temporal"
+);

test/intl402/Temporal/PlainDateTime/from/islamic-rgsa.js

@@ -0,0 +1,15 @@
+// Copyright (C) 2025 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plaindatetime.prototype.from
+description: "islamic-rgsa" calendar name is not supported
+features: [Temporal, Intl.Era-monthcode]
+---*/
+
+const calendar = "islamic-rgsa";
+
+assert.throws(RangeError, () =>
+  Temporal.PlainDateTime.from({year: 1500, month: 1, day: 1, hour: 12, minute: 34, calendar}),
+  "fallback for calendar ID 'islamic-rgsa' only supported in Intl.DateTimeFormat constructor, not Temporal"
+);

test/intl402/Temporal/PlainDateTime/from/islamic.js

@@ -0,0 +1,15 @@
+// Copyright (C) 2025 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plaindatetime.prototype.from
+description: "islamic" calendar name is not supported
+features: [Temporal, Intl.Era-monthcode]
+---*/
+
+const calendar = "islamic";
+
+assert.throws(RangeError, () =>
+  Temporal.PlainDateTime.from({year: 1500, month: 1, day: 1, calendar}),
+  "fallback for calendar ID 'islamic' only supported in Intl.DateTimeFormat constructor, not Temporal"
+);

test/intl402/Temporal/PlainMonthDay/from/islamic-rgsa.js

@@ -0,0 +1,15 @@
+// Copyright (C) 2025 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plainmonthday.prototype.from
+description: "islamic-rgsa" calendar name is not supported
+features: [Temporal, Intl.Era-monthcode]
+---*/
+
+const calendar = "islamic-rgsa";
+
+assert.throws(RangeError, () =>
+  Temporal.PlainMonthDay.from({month: 1, day: 1, calendar}),
+  "fallback for calendar ID 'islamic-rgsa' only supported in Intl.DateTimeFormat constructor, not Temporal"
+);

test/intl402/Temporal/PlainMonthDay/from/islamic.js

@@ -0,0 +1,15 @@
+// Copyright (C) 2025 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plainmonthday.prototype.from
+description: "islamic" calendar name is not supported
+features: [Temporal, Intl.Era-monthcode]
+---*/
+
+const calendar = "islamic";
+
+assert.throws(RangeError, () =>
+  Temporal.PlainMonthDay.from({year: 1500, month: 1, day: 1, calendar}),
+  "fallback for calendar ID 'islamic' only supported in Intl.DateTimeFormat constructor, not Temporal"
+);

test/intl402/Temporal/PlainYearMonth/from/islamic-rgsa.js

@@ -0,0 +1,15 @@
+// Copyright (C) 2025 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plainyearmonth.prototype.from
+description: "islamic-rgsa" calendar name is not supported
+features: [Temporal, Intl.Era-monthcode]
+---*/
+
+const calendar = "islamic-rgsa";
+
+assert.throws(RangeError, () =>
+  Temporal.PlainYearMonth.from({year: 1500, month: 1, calendar}),
+  "fallback for calendar ID 'islamic-rgsa' only supported in Intl.DateTimeFormat constructor, not Temporal"
+);

test/intl402/Temporal/PlainYearMonth/from/islamic.js

@@ -0,0 +1,15 @@
+// Copyright (C) 2025 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plainyearmonth.prototype.from
+description: "islamic" calendar name is not supported
+features: [Temporal, Intl.Era-monthcode]
+---*/
+
+const calendar = "islamic";
+
+assert.throws(RangeError, () =>
+  Temporal.PlainYearMonth.from({year: 1500, month: 1, day: 1, calendar}),
+  "fallback for calendar ID 'islamic' only supported in Intl.DateTimeFormat constructor, not Temporal"
+);

test/intl402/Temporal/ZonedDateTime/from/islamic-rgsa.js

@@ -0,0 +1,15 @@
+// Copyright (C) 2025 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.zoneddatetime.prototype.from
+description: "islamic-rgsa" calendar name is not supported
+features: [Temporal, Intl.Era-monthcode]
+---*/
+
+const calendar = "islamic-rgsa";
+
+assert.throws(RangeError, () =>
+  Temporal.ZonedDateTime.from({year: 1500, month: 1, day: 1, hour: 12, minute: 34, timeZone: "UTC", calendar}),
+  "fallback for calendar ID 'islamic-rgsa' only supported in Intl.DateTimeFormat constructor, not Temporal"
+);

test/intl402/Temporal/ZonedDateTime/from/islamic.js

@@ -0,0 +1,15 @@
+// Copyright (C) 2025 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.zoneddatetime.prototype.from
+description: "islamic" calendar name is not supported
+features: [Temporal, Intl.Era-monthcode]
+---*/
+
+const calendar = "islamic";
+
+assert.throws(RangeError, () =>
+  Temporal.ZonedDateTime.from({year: 1500, month: 1, day: 1, calendar}),
+  "fallback for calendar ID 'islamic' only supported in Intl.DateTimeFormat constructor, not Temporal"
+);

test/staging/Intl402/Temporal/old/islamic-calendars-islamic-rgsa.js

@@ -1,12 +0,0 @@
-// Copyright (C) 2023 Justin Grant. All rights reserved.
-// This code is governed by the BSD license found in the LICENSE file.
-
-/*---
-esid: sec-temporal-intl
-description: Islamic calendar "islamic-rgsa".
-features: [Temporal]
----*/
-
-assert.throws(RangeError, function () {
-  Temporal.PlainDate.from({ year: 1500, month: 1, day: 1, calendar: "islamic-rgsa" });
-}, "fallback for calendar ID 'islamic-rgsa' only supported in Intl.DateTimeFormat constructor, not Temporal");

test/staging/Intl402/Temporal/old/islamic-calendars-islamic.js

@@ -1,12 +0,0 @@
-// Copyright (C) 2023 Justin Grant. All rights reserved.
-// This code is governed by the BSD license found in the LICENSE file.
-
-/*---
-esid: sec-temporal-intl
-description: Islamic calendar "islamic".
-features: [Temporal]
----*/
-
-assert.throws(RangeError, function () {
-  Temporal.PlainDate.from({ year: 1500, month: 1, day: 1, calendar: "islamic" });
-}, "fallback for calendar ID 'islamic' only supported in Intl.DateTimeFormat constructor, not Temporal");