1 files changed, 69 insertions, 0 deletions
diff --git a/js/src/tests/test262/intl402/DateTimeFormat/prototype/formatToParts/fractionalSecondDigits.js b/js/src/tests/test262/intl402/DateTimeFormat/prototype/formatToParts/fractionalSecondDigits.js
new file mode 100644
index 0000000000..543dfb2274
--- /dev/null
+++ b/js/src/tests/test262/intl402/DateTimeFormat/prototype/formatToParts/fractionalSecondDigits.js
@@ -0,0 +1,69 @@
+// Copyright 2019 Google Inc. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-createdatetimeformat
+description: Checks basic handling of fractionalSecondDigits.
+features: [Intl.DateTimeFormat-fractionalSecondDigits]
+locale: [en-US]
+---*/
+
+const d1 = new Date(2019, 7, 10,  1, 2, 3, 234);
+const d2 = new Date(2019, 7, 10,  1, 2, 3, 567);
+
+function assertParts(parts, minute, second, fractionalSecond, message) {
+  if (fractionalSecond === null) {
+    assert.sameValue(parts.length, 3, `length should be 3, ${message}`);
+  } else {
+    assert.sameValue(parts.length, 5, `length should be 5, ${message}`);
+  }
+  assert.sameValue(parts[0].value, minute, `minute part value. ${message}`);
+  assert.sameValue(parts[0].type, 'minute', `minute part type. ${message}`);
+  assert.sameValue(parts[1].value, ':', `literal part value. ${message}`);
+  assert.sameValue(parts[1].type, 'literal', `literal part type. ${message}`);
+  assert.sameValue(parts[2].value, second, `second part value. ${message}`);
+  assert.sameValue(parts[2].type, 'second', `second part type. ${message}`);
+  if (fractionalSecond !== null) {
+    assert.sameValue(parts[3].value, '.', `literal part value. ${message}`);
+    assert.sameValue(parts[3].type, 'literal', `literal part type. ${message}`);
+    assert.sameValue(parts[4].value, fractionalSecond, `fractionalSecond part value. ${message}`);
+    assert.sameValue(parts[4].type, 'fractionalSecond', `fractionalSecond part type. ${message}`);
+  }
+}
+
+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"});
+assertParts(dtf.formatToParts(d1), "02", "03", null, "no fractionalSecondDigits round down");
+assertParts(dtf.formatToParts(d2), "02", "03", null, "no fractionalSecondDigits round down");
+
+dtf = new Intl.DateTimeFormat(
+    'en', { minute: "numeric", second: "numeric", fractionalSecondDigits: undefined});
+assertParts(dtf.formatToParts(d1), "02", "03", null, "no fractionalSecondDigits round down");
+assertParts(dtf.formatToParts(d2), "02", "03", null, "no fractionalSecondDigits round down");
+
+dtf = new Intl.DateTimeFormat(
+    'en', { minute: "numeric", second: "numeric", fractionalSecondDigits: 1});
+assertParts(dtf.formatToParts(d1), "02", "03", "2", "1 fractionalSecondDigits round down");
+assertParts(dtf.formatToParts(d2), "02", "03", "5", "1 fractionalSecondDigits round down");
+
+dtf = new Intl.DateTimeFormat(
+    'en', { minute: "numeric", second: "numeric", fractionalSecondDigits: 2});
+assertParts(dtf.formatToParts(d1), "02", "03", "23", "2 fractionalSecondDigits round down");
+assertParts(dtf.formatToParts(d2), "02", "03", "56", "2 fractionalSecondDigits round down");
+
+dtf = new Intl.DateTimeFormat(
+    'en', { minute: "numeric", second: "numeric", fractionalSecondDigits: 3});
+assertParts(dtf.formatToParts(d1), "02", "03", "234", "3 fractionalSecondDigits round down");
+assertParts(dtf.formatToParts(d2), "02", "03", "567", "3 fractionalSecondDigits round down");
+
+reportCompare(0, 0);