1 files changed, 41 insertions, 0 deletions
diff --git a/js/src/tests/non262/Intl/NumberFormat/formatRangeToParts-approximately-sign-unit.js b/js/src/tests/non262/Intl/NumberFormat/formatRangeToParts-approximately-sign-unit.js
new file mode 100644
index 0000000000..51507e57df
--- /dev/null
+++ b/js/src/tests/non262/Intl/NumberFormat/formatRangeToParts-approximately-sign-unit.js
@@ -0,0 +1,41 @@
+// |reftest| skip-if(!this.hasOwnProperty("Intl")||release_or_beta)
+
+if (typeof getAvailableLocalesOf === "undefined") {
+  var getAvailableLocalesOf = SpecialPowers.Cu.getJSTestingFunctions().getAvailableLocalesOf;
+}
+
+const numbers = [
+  0, 1, 2, 5, 10, 100, 1000, 10_000, 100_000, 1_000_000,
+  0.1, 0.2, 0.5, 1.5,
+  -0, -1, -2, -5,
+  Infinity, -Infinity,
+];
+
+const options = {style: "unit", unit: "meter"};
+
+// List of known approximately sign in CLDR 40.
+const approximatelySigns = [
+  "~", "∼", "≈", "≃", "ca.", "約", "dáàṣì", "dáàshì",
+];
+
+// Iterate over all locales and ensure we find exactly one approximately sign.
+for (let locale of getAvailableLocalesOf("NumberFormat").sort()) {
+  let nf = new Intl.NumberFormat(locale, options);
+  for (let number of numbers) {
+    let parts = nf.formatRangeToParts(number, number);
+    let approx = parts.filter(part => part.type === "approximatelySign");
+
+    // Known failure case.
+    // - https://github.com/tc39/proposal-intl-numberformat-v3/issues/64
+    // - https://unicode-org.atlassian.net/browse/CLDR-14918
+    if (approx.length === 0 && new Intl.Locale(locale).language === "ar") {
+      continue;
+    }
+
+    assertEq(approx.length, 1);
+    assertEq(approximatelySigns.some(approxSign => approx[0].value.includes(approxSign)), true);
+  }
+}
+
+if (typeof reportCompare === "function")
+  reportCompare(true, true);