1 files changed, 80 insertions, 0 deletions
diff --git a/js/src/tests/test262/intl402/Temporal/Calendar/prototype/mergeFields/japanese-mutually-exclusive-fields.js b/js/src/tests/test262/intl402/Temporal/Calendar/prototype/mergeFields/japanese-mutually-exclusive-fields.js
new file mode 100644
index 0000000000..6742dc134a
--- /dev/null
+++ b/js/src/tests/test262/intl402/Temporal/Calendar/prototype/mergeFields/japanese-mutually-exclusive-fields.js
@@ -0,0 +1,80 @@
+// |reftest| skip-if(!this.hasOwnProperty('Temporal')) -- Temporal is not enabled unconditionally
+// Copyright (C) 2023 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.calendar.prototype.mergefields
+description: Calendar-specific mutually exclusive keys in mergeFields
+features: [Temporal]
+---*/
+
+function assertEntriesEqual(actual, expectedEntries, message) {
+  const names = Object.getOwnPropertyNames(actual);
+  const symbols = Object.getOwnPropertySymbols(actual);
+  const actualKeys = names.concat(symbols);
+  assert.sameValue(
+    actualKeys.length,
+    expectedEntries.length,
+    `${message}: expected object to have ${expectedEntries.length} properties, not ${actualKeys.length}:`
+  );
+  for (var index = 0; index < actualKeys.length; index++) {
+    const actualKey = actualKeys[index];
+    const expectedKey = expectedEntries[index][0];
+    const expectedValue = expectedEntries[index][1];
+    assert.sameValue(actualKey, expectedKey, `${message}: key ${index}:`);
+    assert.sameValue(actual[actualKey], expectedValue, `${message}: value ${index}:`);
+  }
+}
+
+const instance = new Temporal.Calendar("japanese");
+
+const lastDayOfShowaFields = { era: "showa", eraYear: 64, year: 1989, month: 1, monthCode: "M01", day: 7 };
+
+assertEntriesEqual(instance.mergeFields(lastDayOfShowaFields, { day: 10 }), [
+  ["year", 1989],
+  ["month", 1],
+  ["monthCode", "M01"],
+  ["day", 10],
+], "day excludes era and eraYear");
+
+assertEntriesEqual(instance.mergeFields(lastDayOfShowaFields, { month: 2 }), [
+  ["year", 1989],
+  ["month", 2],
+  ["day", 7],
+], "month excludes monthCode, era, and eraYear");
+
+assertEntriesEqual(instance.mergeFields(lastDayOfShowaFields, { monthCode: "M03" }), [
+  ["year", 1989],
+  ["monthCode", "M03"],
+  ["day", 7],
+], "monthCode excludes month, era, and eraYear");
+
+assertEntriesEqual(instance.mergeFields(lastDayOfShowaFields, { year: 1988 }), [
+  ["year", 1988],
+  ["month", 1],
+  ["monthCode", "M01"],
+  ["day", 7],
+], "year excludes era and eraYear (within same era)");
+
+assertEntriesEqual(instance.mergeFields(lastDayOfShowaFields, { year: 1990 }), [
+  ["year", 1990],
+  ["month", 1],
+  ["monthCode", "M01"],
+  ["day", 7],
+], "year excludes era and eraYear (in a different era)");
+
+assertEntriesEqual(instance.mergeFields(lastDayOfShowaFields, { eraYear: 1 }), [
+  ["eraYear", 1],
+  ["month", 1],
+  ["monthCode", "M01"],
+  ["day", 7],
+], "eraYear excludes year and era");
+
+assertEntriesEqual(instance.mergeFields(lastDayOfShowaFields, { era: "heisei" }), [
+  ["era", "heisei"],
+  ["month", 1],
+  ["monthCode", "M01"],
+  ["day", 7],
+], "era excludes year and eraYear");
+
+reportCompare(0, 0);