Add a test for Unicode key-type pairs being canonicalized by Intl.Locale regardless whether they're passed in the input tag, or through the options object.

test/intl402/Locale/constructor-options-canonicalized.js

@@ -0,0 +1,69 @@
+// Copyright 2020 Mozilla Corporation. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-resolvelocale
+description: >
+    Values provided as properties of the options-argument to the Locale
+    constructor are converted to canonical form.
+info: |
+    ResolveLocale ( availableLocales, requestedLocales, options, relevantExtensionKeys, localeData )
+
+    ...
+    9.i.iii.1. Let optionsValue be the string optionsValue after performing the algorithm steps to transform Unicode extension values to canonical syntax per Unicode Technical Standard #35 LDML § 3.2.1 Canonical Unicode Locale Identifiers, treating key as ukey and optionsValue as uvalue productions.
+    9.i.iii.2. Let optionsValue be the string optionsValue after performing the algorithm steps to replace Unicode extension values with their canonical form per Unicode Technical Standard #35 LDML § 3.2.1 Canonical Unicode Locale Identifiers, treating key as ukey and optionsValue as uvalue productions.
+    ...
+
+features: [Intl.Locale]
+---*/
+
+const keyValueTests = [
+  {
+    key: "ca",
+    option: "calendar",
+    tests: [
+      ["islamicc", "islamic-civil"],
+      ["ethiopic-amete-alem", "ethioaa"],
+    ],
+  },
+];
+
+for (const { key, option, tests } of keyValueTests) {
+  for (const [noncanonical, canonical] of tests) {
+    let canonicalInLocale =
+      new Intl.Locale(`en-u-${key}-${canonical}`);
+
+    assert.sameValue(
+      canonicalInLocale[option],
+      canonical,
+      `new Intl.Locale("en-u-${key}-${canonical}").${option} returns ${canonical}`
+    );
+
+    let canonicalInOption =
+      new Intl.Locale(`en`, { [option]: canonical });
+
+    assert.sameValue(
+      canonicalInOption[option],
+      canonical,
+      `new Intl.Locale("en", { ${option}: "${canonical}" }).${option} returns ${canonical}`
+    );
+
+    let noncanonicalInLocale =
+      new Intl.Locale(`en-u-${key}-${noncanonical}`);
+
+    assert.sameValue(
+      noncanonicalInLocale[option],
+      canonical,
+      `new Intl.Locale("en-u-${key}-${noncanonical}").${option} returns ${canonical}`
+    );
+
+    let noncanonicalInOption =
+      new Intl.Locale(`en`, { [option]: noncanonical });
+
+    assert.sameValue(
+      noncanonicalInOption[option],
+      canonical,
+      `new Intl.Locale("en", { ${option}: "${noncanonical}" }).${option} returns ${canonical}`
+    );
+  }
+}