1 files changed, 97 insertions, 0 deletions
diff --git a/js/src/tests/non262/Intl/NumberFormat/use-grouping.js b/js/src/tests/non262/Intl/NumberFormat/use-grouping.js
new file mode 100644
index 0000000000..8fcb2fb51e
--- /dev/null
+++ b/js/src/tests/non262/Intl/NumberFormat/use-grouping.js
@@ -0,0 +1,97 @@
+// |reftest| skip-if(!this.hasOwnProperty("Intl")||release_or_beta)
+
+const tests = {
+  // minimumGroupingDigits is one for "en" (English).
+  "en": {
+    values: [
+      {
+        value: 1000,
+        useGroupings: {
+          auto: "1,000",
+          always: "1,000",
+          min2: "1000",
+          "": "1000",
+        },
+      },
+      {
+        value: 10000,
+        useGroupings: {
+          auto: "10,000",
+          always: "10,000",
+          min2: "10,000",
+          "": "10000",
+        },
+      },
+    ],
+  },
+
+  // minimumGroupingDigits is two for "pl" (Polish).
+  "pl": {
+    values: [
+      {
+        value: 1000,
+        useGroupings: {
+          auto: "1000",
+          always: "1 000",
+          min2: "1000",
+          "": "1000",
+        },
+      },
+      {
+        value: 10000,
+        useGroupings: {
+          auto: "10 000",
+          always: "10 000",
+          min2: "10 000",
+          "": "10000",
+        },
+      },
+    ],
+  },
+};
+
+for (let [locale, {options = {}, values}] of Object.entries(tests)) {
+  for (let {value, useGroupings} of values) {
+    for (let [useGrouping, expected] of Object.entries(useGroupings)) {
+      let nf = new Intl.NumberFormat(locale, {...options, useGrouping});
+      assertEq(nf.format(value), expected, `locale=${locale}, value=${value}, useGrouping=${useGrouping}`);
+    }
+  }
+}
+
+// Resolved options.
+for (let [useGrouping, expected] of [
+  [false, false],
+  ["", false],
+  [0, false],
+  [null, false],
+
+  ["auto", "auto"],
+  [undefined, "auto"],
+
+  ["always", "always"],
+  [true, "always"],
+
+  ["min2", "min2"],
+
+  // Unsupported values fallback to "auto"
+  ["true", "auto"],
+  ["false", "auto"],
+  ["none", "auto"],
+  ["yes", "auto"],
+  ["no", "auto"],
+  [{}, "auto"],
+  [123, "auto"],
+  [123n, "auto"],
+]) {
+  let nf = new Intl.NumberFormat("en", {useGrouping});
+  assertEq(nf.resolvedOptions().useGrouping , expected);
+}
+
+// Throws a TypeError if ToString fails.
+for (let useGrouping of [Object.create(null), Symbol()]) {
+  assertThrowsInstanceOf(() => new Intl.NumberFormat("en", {useGrouping}), TypeError);
+}
+
+if (typeof reportCompare === "function")
+  reportCompare(true, true);