1 files changed, 43 insertions, 0 deletions
diff --git a/js/src/tests/non262/Intl/DateTimeFormat/fractional-second-digits.js b/js/src/tests/non262/Intl/DateTimeFormat/fractional-second-digits.js
new file mode 100644
index 0000000000..c6c29be604
--- /dev/null
+++ b/js/src/tests/non262/Intl/DateTimeFormat/fractional-second-digits.js
@@ -0,0 +1,43 @@
+// |reftest| skip-if(!this.hasOwnProperty("Intl"))
+
+const {
+    Second, FractionalSecond, Literal
+} = DateTimeFormatParts
+
+const tests = [
+  {
+      date: new Date("2019-01-01T00:00:00.123"),
+      digits: {
+          1: [Second("0"), Literal("."), FractionalSecond("1")],
+          2: [Second("0"), Literal("."), FractionalSecond("12")],
+          3: [Second("0"), Literal("."), FractionalSecond("123")],
+      }
+  },
+  {
+      date: new Date("2019-01-01T00:00:00.023"),
+      digits: {
+          1: [Second("0"), Literal("."), FractionalSecond("0")],
+          2: [Second("0"), Literal("."), FractionalSecond("02")],
+          3: [Second("0"), Literal("."), FractionalSecond("023")],
+      }
+  },
+  {
+      date: new Date("2019-01-01T00:00:00.003"),
+      digits: {
+          1: [Second("0"), Literal("."), FractionalSecond("0")],
+          2: [Second("0"), Literal("."), FractionalSecond("00")],
+          3: [Second("0"), Literal("."), FractionalSecond("003")],
+      }
+  },
+];
+
+for (let {date, digits} of tests) {
+    for (let [fractionalSecondDigits, parts] of Object.entries(digits)) {
+        let dtf = new Intl.DateTimeFormat("en", {second: "numeric", fractionalSecondDigits});
+
+        assertParts(dtf, date, parts);
+    }
+}
+
+if (typeof reportCompare === "function")
+  reportCompare(0, 0, "ok");