Improve and extend the tests for ApplyOptionsToTag.

test/intl402/Locale/constructor-options-language-valid.js

@@ -15,15 +15,15 @@ info: |
 
     ApplyOptionsToTag( tag, options )
     ...
-    9. If tag matches the langtag production, then
-        a. If language is not undefined, then
+    9. If tag matches neither the privateuse nor the grandfathered production, then
+        b. If language is not undefined, then
             i. Set tag to tag with the substring corresponding to the language production replaced by the string language.
 
 features: [Intl.Locale]
 ---*/
 
 const validLanguageOptions = [
-  [undefined, "en"],
+  [undefined, undefined],
   [null, "null"],
   ["zh-cmn", "cmn"],
   ["ZH-CMN", "cmn"],
@@ -38,7 +38,19 @@ for (const [language, expected] of validLanguageOptions) {
   let options = { language };
   assert.sameValue(
     new Intl.Locale('en', options).toString(),
-    expected,
+    expected || 'en',
     `new Intl.Locale('en', options).toString() equals the value of ${expected}`
   );
+
+  assert.sameValue(
+    new Intl.Locale('en-US', options).toString(),
+    (expected || "en") + "-US",
+    `new Intl.Locale('en-US', options).toString() equals the value of ${expected}-US`
+  );
+
+  assert.sameValue(
+    new Intl.Locale('en-els', options).toString(),
+    expected || "en-els",
+    `new Intl.Locale('en-els', options).toString() equals the value of ${expected}`
+  );
 }

test/intl402/Locale/constructor-options-region-valid.js

@@ -17,16 +17,19 @@ info: |
     ...
     7. Let region be ? GetOption(options, "region", "string", undefined, undefined).
     ...
-    9. If tag matches the langtag production, then
+    9. If tag matches neither the privateuse nor the grandfathered production, then
       ...
-      c. If region is not undefined, then
+      d. If region is not undefined, then
         i. If tag does not contain a region production, then
           1. Set tag to the concatenation of the language production of tag, the substring corresponding to the "-" script production if present, "-", region, and the rest of tag.
+        ii. Else,
+          1. Set tag to tag with the substring corresponding to the region production replaced by the string region.
 
 features: [Intl.Locale]
 ---*/
 
 const validRegionOptions = [
+  [undefined, undefined],
   ["FR", "en-FR"],
   ["554", "en-554"],
   [554, "en-554"],
@@ -35,12 +38,25 @@ for (const [region, expected] of validRegionOptions) {
   let options = { region };
   assert.sameValue(
     new Intl.Locale('en', options).toString(),
-    expected,
+    expected || "en",
     `new Intl.Locale('en', options).toString() equals the value of ${expected}`
   );
+
   assert.sameValue(
     new Intl.Locale('en-US', options).toString(),
-    expected,
+    expected || "en-US",
     `new Intl.Locale('en-US', options).toString() equals the value of ${expected}`
   );
+
+  assert.sameValue(
+    new Intl.Locale('en-u-ca-gregory', options).toString(),
+    (expected || "en") + "-u-ca-gregory",
+    `new Intl.Locale('en-u-ca-gregory', options).toString() equals the value of ${expected}`
+  );
+
+  assert.sameValue(
+    new Intl.Locale('en-US-u-ca-gregory', options).toString(),
+    (expected || "en-US") + "-u-ca-gregory",
+    `new Intl.Locale('en-US-u-ca-gregory', options).toString() equals the value of ${expected}`
+  );
 }

test/intl402/Locale/constructor-options-script-valid.js

@@ -17,9 +17,9 @@ info: |
     ...
     5. Let script be ? GetOption(options, "script", "string", undefined, undefined).
     ...
-    9. If tag matches the langtag production, then
+    9. If tag matches neither the privateuse nor the grandfathered production, then
       ...
-      b. If script is not undefined, then
+      c. If script is not undefined, then
         i. If tag does not contain a script production, then
           1. Set tag to the concatenation of the language production of tag, "-", script, and the rest of tag.
         ii. Else,
@@ -30,22 +30,30 @@ features: [Intl.Locale]
 ---*/
 
 const validScriptOptions = [
-  [null, "en-Null"],
-  ["bali", "en-Bali"],
-  ["Bali", "en-Bali"],
-  ["bALI", "en-BALI"], // TODO REVIEW: is this the correct case regularization?
-  [{ toString() { return "Brai" } }, "en-Brai"],
+  [undefined, undefined],
+  [null, "Null"],
+  ["bali", "Bali"],
+  ["Bali", "Bali"],
+  ["bALI", "BALI"], // TODO REVIEW: is this the correct case regularization?
+  [{ toString() { return "Brai" } }, "Brai"],
 ];
 for (const [script, expected] of validScriptOptions) {
   let options = { script };
   assert.sameValue(
     new Intl.Locale("en", options).toString(),
-    expected,
+    expected ? ("en-" + expected) : "en",
     `new Intl.Locale("en", options).toString() equals the value of ${expected}`
   );
+
+  assert.sameValue(
+    new Intl.Locale("en-DK", options).toString(),
+    (expected ? ("en-" + expected) : "en") + "-DK",
+    `new Intl.Locale("en", options).toString() equals the value of ${expected}`
+  );
+
   assert.sameValue(
     new Intl.Locale("en-Cyrl", options).toString(),
-    expected,
+    expected ? ("en-" + expected) : "en-Cyrl",
     `new Intl.Locale("en-Cyrl", options).toString() equals the value of ${expected}`
   );
 }