1 files changed, 60 insertions, 0 deletions
diff --git a/js/src/tests/non262/Intl/RelativeTimeFormat/numberingSystem-option.js b/js/src/tests/non262/Intl/RelativeTimeFormat/numberingSystem-option.js
new file mode 100644
index 0000000000..bbde290dfa
--- /dev/null
+++ b/js/src/tests/non262/Intl/RelativeTimeFormat/numberingSystem-option.js
@@ -0,0 +1,60 @@
+const defaultLocale = "en";
+const defaultNumberingSystem = new Intl.RelativeTimeFormat(defaultLocale).resolvedOptions().numberingSystem;
+
+function createWithLocale(locale, numberingSystem) {
+  return new Intl.RelativeTimeFormat(locale, {numberingSystem});
+}
+
+function create(numberingSystem) {
+  return createWithLocale(defaultLocale, numberingSystem);
+}
+
+// Empty string should throw.
+assertThrowsInstanceOf(() => create(""), RangeError);
+
+// Trailing \0 should throw.
+assertThrowsInstanceOf(() => create("latn\0"), RangeError);
+
+// Too short or too long strings should throw.
+assertThrowsInstanceOf(() => create("a"), RangeError);
+assertThrowsInstanceOf(() => create("toolongstring"), RangeError);
+
+// Throw even when prefix is valid.
+assertThrowsInstanceOf(() => create("latn-toolongstring"), RangeError);
+
+// |numberingSystem| can be set to |undefined|.
+let nf = create(undefined);
+assertEq(nf.resolvedOptions().numberingSystem, defaultNumberingSystem);
+
+// Unsupported numbering systems are ignored.
+nf = create("xxxxxxxx");
+assertEq(nf.resolvedOptions().numberingSystem, defaultNumberingSystem);
+
+// Numbering system in options overwrite Unicode extension keyword.
+nf = createWithLocale(`${defaultLocale}-u-nu-thai`, "arab");
+assertEq(nf.resolvedOptions().locale, defaultLocale);
+assertEq(nf.resolvedOptions().numberingSystem, "arab");
+
+// |numberingSystem| option ignores case.
+nf = create("ARAB");
+assertEq(nf.resolvedOptions().locale, defaultLocale);
+assertEq(nf.resolvedOptions().numberingSystem, "arab");
+
+for (let [numberingSystem, {algorithmic}] of Object.entries(numberingSystems)) {
+  let nf1 = new Intl.RelativeTimeFormat(`${defaultLocale}-u-nu-${numberingSystem}`);
+  let nf2 = new Intl.RelativeTimeFormat(defaultLocale, {numberingSystem});
+
+  if (!algorithmic) {
+    assertEq(nf1.resolvedOptions().numberingSystem, numberingSystem);
+    assertEq(nf2.resolvedOptions().numberingSystem, numberingSystem);
+  } else {
+    // We don't yet support algorithmic numbering systems.
+    assertEq(nf1.resolvedOptions().numberingSystem, defaultNumberingSystem);
+    assertEq(nf2.resolvedOptions().numberingSystem, defaultNumberingSystem);
+  }
+
+  assertEq(nf2.format(0, "second"), nf1.format(0, "second"));
+}
+
+if (typeof reportCompare === "function")
+  reportCompare(true, true);