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diff --git a/js/src/tests/Intl/DateTimeFormat/formatToParts.js b/js/src/tests/Intl/DateTimeFormat/formatToParts.js
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+++ b/js/src/tests/Intl/DateTimeFormat/formatToParts.js
@@ -0,0 +1,170 @@
+// |reftest| skip-if(!this.hasOwnProperty("Intl"))
+// Any copyright is dedicated to the Public Domain.
+// http://creativecommons.org/licenses/publicdomain/
+
+// Tests the format function with a diverse set of locales and options.
+// Always use UTC to avoid dependencies on test environment.
+
+/*
+ * Return true if A is equal to B, where equality on arrays and objects
+ * means that they have the same set of enumerable properties, the values
+ * of each property are deep_equal, and their 'length' properties are
+ * equal. Equality on other types is ==.
+ */
+function deepEqual(a, b) {
+    if (typeof a !== typeof b)
+        return false;
+
+    if (a === null)
+        return b === null;
+
+    if (typeof a === 'object') {
+        // For every property of a, does b have that property with an equal value?
+        var props = {};
+        for (var prop in a) {
+            if (!deepEqual(a[prop], b[prop]))
+                return false;
+            props[prop] = true;
+        }
+
+        // Are all of b's properties present on a?
+        for (var prop in b)
+            if (!props[prop])
+                return false;
+
+        // length isn't enumerable, but we want to check it, too.
+        return a.length === b.length;
+    }
+
+    return Object.is(a, b);
+}
+
+function composeDate(parts) {
+  return parts.map(({value}) => value)
+              .reduce((string, part) => string + part);
+}
+
+var format;
+var date = Date.UTC(2012, 11, 17, 3, 0, 42);
+
+// Locale en-US; default options.
+format = new Intl.DateTimeFormat("en-us", {timeZone: "UTC"});
+assertEq(deepEqual(format.formatToParts(date), [
+  { type: 'month', value: '12' },
+  { type: 'literal', value: '/' },
+  { type: 'day', value: '17' },
+  { type: 'literal', value: '/' },
+  { type: 'year', value: '2012' }
+]), true);
+
+// Just date
+format = new Intl.DateTimeFormat("en-us", {
+  year: 'numeric',
+  month: 'numeric',
+  day: 'numeric',
+  timeZone: "UTC"});
+assertEq(deepEqual(format.formatToParts(date), [
+  { type: 'month', value: '12' },
+  { type: 'literal', value: '/' },
+  { type: 'day', value: '17' },
+  { type: 'literal', value: '/' },
+  { type: 'year', value: '2012' }
+]), true);
+assertEq(composeDate(format.formatToParts(date)), format.format(date));
+
+// Just time in hour24
+format = new Intl.DateTimeFormat("en-us", {
+  hour: 'numeric',
+  minute: 'numeric',
+  second: 'numeric',
+  hour12: false,
+  timeZone: "UTC"});
+assertEq(deepEqual(format.formatToParts(date), [
+  { type: 'hour', value: '03' },
+  { type: 'literal', value: ':' },
+  { type: 'minute', value: '00' },
+  { type: 'literal', value: ':' },
+  { type: 'second', value: '42' }
+]), true);
+assertEq(composeDate(format.formatToParts(date)), format.format(date));
+
+// Just time in hour12
+format = new Intl.DateTimeFormat("en-us", {
+  hour: 'numeric',
+  minute: 'numeric',
+  second: 'numeric',
+  hour12: true,
+  timeZone: "UTC"});
+assertEq(deepEqual(format.formatToParts(date), [
+  { type: 'hour', value: '3' },
+  { type: 'literal', value: ':' },
+  { type: 'minute', value: '00' },
+  { type: 'literal', value: ':' },
+  { type: 'second', value: '42' },
+  { type: 'literal', value: ' ' },
+  { type: 'dayPeriod', value: 'AM' }
+]), true);
+assertEq(composeDate(format.formatToParts(date)), format.format(date));
+
+// Just month.
+format = new Intl.DateTimeFormat("en-us", {
+  month: "narrow",
+  timeZone: "UTC"});
+assertEq(deepEqual(format.formatToParts(date), [
+  { type: 'month', value: 'D' }
+]), true);
+assertEq(composeDate(format.formatToParts(date)), format.format(date));
+
+// Just weekday.
+format = new Intl.DateTimeFormat("en-us", {
+  weekday: "narrow",
+  timeZone: "UTC"});
+assertEq(deepEqual(format.formatToParts(date), [
+  { type: 'weekday', value: 'M' }
+]), true);
+assertEq(composeDate(format.formatToParts(date)), format.format(date));
+
+// Year and era.
+format = new Intl.DateTimeFormat("en-us", {
+  year: "numeric",
+  era: "short",
+  timeZone: "UTC"});
+assertEq(deepEqual(format.formatToParts(date), [
+  { type: 'year', value: '2012' },
+  { type: 'literal', value: ' ' },
+  { type: 'era', value: 'AD' }
+]), true);
+assertEq(composeDate(format.formatToParts(date)), format.format(date));
+
+// Time and date
+format = new Intl.DateTimeFormat("en-us", {
+  weekday: 'long',
+  year: 'numeric',
+  month: 'numeric',
+  day: 'numeric',
+  hour: 'numeric',
+  minute: 'numeric',
+  second: 'numeric',
+  hour12: true,
+  timeZone: "UTC"});
+assertEq(deepEqual(format.formatToParts(date), [
+  { type: 'weekday', value: 'Monday' },
+  { type: 'literal', value: ', ' },
+  { type: 'month', value: '12' },
+  { type: 'literal', value: '/' },
+  { type: 'day', value: '17' },
+  { type: 'literal', value: '/' },
+  { type: 'year', value: '2012' },
+  { type: 'literal', value: ', ' },
+  { type: 'hour', value: '3' },
+  { type: 'literal', value: ':' },
+  { type: 'minute', value: '00' },
+  { type: 'literal', value: ':' },
+  { type: 'second', value: '42' },
+  { type: 'literal', value: ' ' },
+  { type: 'dayPeriod', value: 'AM' }
+]), true);
+assertEq(composeDate(format.formatToParts(date)), format.format(date));
+
+if (typeof reportCompare === "function")
+    reportCompare(0, 0, 'ok');