1 files changed, 98 insertions, 0 deletions
diff --git a/js/src/tests/non262/Intl/NumberFormat/trailing-zero-display.js b/js/src/tests/non262/Intl/NumberFormat/trailing-zero-display.js
new file mode 100644
index 0000000000..5e3113285a
--- /dev/null
+++ b/js/src/tests/non262/Intl/NumberFormat/trailing-zero-display.js
@@ -0,0 +1,98 @@
+// |reftest| skip-if(!this.hasOwnProperty("Intl")||release_or_beta)
+
+// "stripIfInteger" with fractional digits.
+{
+  let nf1 = new Intl.NumberFormat("en", {
+    minimumFractionDigits: 2,
+  });
+
+  let nf2 = new Intl.NumberFormat("en", {
+    minimumFractionDigits: 2,
+    trailingZeroDisplay: "auto",
+  });
+
+  let nf3 = new Intl.NumberFormat("en", {
+    minimumFractionDigits: 2,
+    trailingZeroDisplay: "stripIfInteger",
+  });
+
+  assertEq(nf1.resolvedOptions().trailingZeroDisplay, "auto");
+  assertEq(nf2.resolvedOptions().trailingZeroDisplay, "auto");
+  assertEq(nf3.resolvedOptions().trailingZeroDisplay, "stripIfInteger");
+
+  assertEq(nf1.format(123), "123.00");
+  assertEq(nf2.format(123), "123.00");
+  assertEq(nf3.format(123), "123");
+}
+
+// "stripIfInteger" with significand digits.
+{
+  let nf1 = new Intl.NumberFormat("en", {
+    minimumSignificantDigits: 2,
+  });
+
+  let nf2 = new Intl.NumberFormat("en", {
+    minimumSignificantDigits: 2,
+    trailingZeroDisplay: "auto",
+  });
+
+  let nf3 = new Intl.NumberFormat("en", {
+    minimumSignificantDigits: 2,
+    trailingZeroDisplay: "stripIfInteger",
+  });
+
+  assertEq(nf1.resolvedOptions().trailingZeroDisplay, "auto");
+  assertEq(nf2.resolvedOptions().trailingZeroDisplay, "auto");
+  assertEq(nf3.resolvedOptions().trailingZeroDisplay, "stripIfInteger");
+
+  assertEq(nf1.format(1), "1.0");
+  assertEq(nf2.format(1), "1.0");
+  assertEq(nf3.format(1), "1");
+}
+
+// "stripIfInteger" with rounding increment.
+{
+  let nf1 = new Intl.NumberFormat("en", {
+    minimumFractionDigits: 2,
+    maximumFractionDigits: 2,
+    roundingIncrement: 5,
+  });
+  let nf2 = new Intl.NumberFormat("en", {
+    minimumFractionDigits: 2,
+    maximumFractionDigits: 2,
+    roundingIncrement: 5,
+    trailingZeroDisplay: "auto",
+  });
+  let nf3 = new Intl.NumberFormat("en", {
+    minimumFractionDigits: 2,
+    maximumFractionDigits: 2,
+    roundingIncrement: 5,
+    trailingZeroDisplay: "stripIfInteger",
+  });
+
+  assertEq(nf1.resolvedOptions().trailingZeroDisplay, "auto");
+  assertEq(nf2.resolvedOptions().trailingZeroDisplay, "auto");
+  assertEq(nf3.resolvedOptions().trailingZeroDisplay, "stripIfInteger");
+
+  // NB: Tests 1.975 twice b/c of <https://unicode-org.atlassian.net/browse/ICU-21674>.
+
+  assertEq(nf1.format(1.975), "2.00");
+  assertEq(nf1.format(1.97), "1.95");
+  assertEq(nf1.format(1.975), "2.00");
+
+  assertEq(nf2.format(1.975), "2.00");
+  assertEq(nf2.format(1.97), "1.95");
+  assertEq(nf2.format(1.975), "2.00");
+
+  assertEq(nf3.format(1.975), "2");
+  assertEq(nf3.format(1.97), "1.95");
+  assertEq(nf3.format(1.975), "2");
+}
+
+// Invalid values.
+for (let trailingZeroDisplay of ["", "true", true, "none", "yes", "no"]){
+  assertThrowsInstanceOf(() => new Intl.NumberFormat("en", {trailingZeroDisplay}), RangeError);
+}
+
+if (typeof reportCompare === "function")
+  reportCompare(true, true);