From 21824359d0c302d9b520a57a8979c82b170ea0b4 Mon Sep 17 00:00:00 2001
From: Frank Yung-Fong Tang <41213225+FrankYFTang@users.noreply.github.com>
Date: Thu, 9 Jul 2020 17:57:29 -0700
Subject: [PATCH] restrict the range from 1 to 3

---
 .../formatRangeToParts/fractionalSecondDigits.js     | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/test/intl402/DateTimeFormat/prototype/formatRangeToParts/fractionalSecondDigits.js b/test/intl402/DateTimeFormat/prototype/formatRangeToParts/fractionalSecondDigits.js
index 272f466763..1358bc8f6a 100644
--- a/test/intl402/DateTimeFormat/prototype/formatRangeToParts/fractionalSecondDigits.js
+++ b/test/intl402/DateTimeFormat/prototype/formatRangeToParts/fractionalSecondDigits.js
@@ -27,8 +27,18 @@ const d1 = new Date(2019, 7, 10,  1, 2, 3, 234);
 const d2 = new Date(2019, 7, 10,  1, 2, 3, 567);
 const d3 = new Date(2019, 7, 10,  1, 2, 13, 987);
 
+assert.throws(RangeError, () => {
+    new Intl.DateTimeFormat(
+      'en', { minute: "numeric", second: "numeric", fractionalSecondDigits: 0});
+  }, "fractionalSecondDigits 0 should throw RangeError for out of range");
+
+assert.throws(RangeError, () => {
+    new Intl.DateTimeFormat(
+      'en', { minute: "numeric", second: "numeric", fractionalSecondDigits: 4});
+  }, "fractionalSecondDigits 4 should throw RangeError for out of range");
+
 let dtf = new Intl.DateTimeFormat(
-    'en', { minute: "numeric", second: "numeric", fractionalSecondDigits: 0});
+    'en', { minute: "numeric", second: "numeric", fractionalSecondDigits: undefined});
 
 compare(dtf.formatRangeToParts(d1, d2), [
   { type: "minute", value: "02", source: "shared" },