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diff --git a/js/src/tests/test262/intl402/DurationFormat/prototype/format/style-digital-fractionalDigits-undefined-en.js b/js/src/tests/test262/intl402/DurationFormat/prototype/format/style-digital-fractionalDigits-undefined-en.js
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+++ b/js/src/tests/test262/intl402/DurationFormat/prototype/format/style-digital-fractionalDigits-undefined-en.js
@@ -0,0 +1,80 @@
+// |reftest| skip -- Intl.DurationFormat is not supported
+// Copyright (C) 2023 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-partitiondurationformatpattern
+description: >
+  Test to ensure that correct number of fractional digits is displayed (i.e. however many are necessary to represent the data fully) if the fractionalDigits option is left *undefined*
+
+info: |
+  4. If durationFormat.[[FractionalDigits]] is undefined, then
+    a. Perform ! CreateDataPropertyOrThrow(nfOpts, "maximumFractionDigits", 9).
+    b. Perform ! CreateDataPropertyOrThrow(nfOpts, "minimumFractionDigits", 0).
+  5. Else,
+    a. Perform ! CreateDataPropertyOrThrow(nfOpts, "maximumFractionDigits", durationFormat.[[FractionalDigits]]).
+    b. Perform ! CreateDataPropertyOrThrow(nfOpts, "minimumFractionDigits", durationFormat.[[FractionalDigits]]).
+locale: [en]
+features: [Intl.DurationFormat]
+---*/
+
+
+const durationNano = {
+  hours: 1,
+  minutes: 22,
+  seconds: 33,
+  milliseconds: 111,
+  microseconds: 222,
+  nanoseconds: 333
+};
+
+const durationMicro = {
+  hours: 1,
+  minutes: 22,
+  seconds: 33,
+  milliseconds: 111,
+  microseconds: 222
+};
+
+const durationMilli = {
+  hours: 1,
+  minutes: 22,
+  seconds: 33,
+  milliseconds: 111
+};
+
+const durationNoSubsecond = {
+  hours: 1,
+  minutes: 22,
+  seconds: 33
+};
+
+const durationFiveFractional = {
+  hours: 2,
+  minutes: 30,
+  seconds: 10,
+  milliseconds: 111,
+  microseconds: 220,
+};
+
+const durationSevenFractional = {
+  hours: 2,
+  minutes: 30,
+  seconds: 10,
+  milliseconds: 111,
+  microseconds: 220,
+  nanoseconds: 300
+};
+
+const style = "digital";
+const df = new Intl.DurationFormat("en", {style, fractionalDigits: undefined});
+
+assert.sameValue(df.format(durationNano), "1:22:33.111222333", `format output with nanosecond digits and fractionalDigits: undefined using ${style} style option`);
+assert.sameValue(df.format(durationMicro), "1:22:33.111222", `format output with microsecond digits and fractionalDigits: undefined using ${style} style option`);
+assert.sameValue(df.format(durationMilli), "1:22:33.111", `format output with millisecond digits and fractionalDigits: undefined using ${style} style option`);
+assert.sameValue(df.format(durationNoSubsecond), "1:22:33", `format output with no subsecond digits and fractionalDigits: undefined using ${style} style option`);
+
+assert.sameValue(df.format(durationFiveFractional), "2:30:10.11122", `format output with five subsecond digits and fractionalDigits: undefined using ${style} style option`);
+assert.sameValue(df.format(durationSevenFractional), "2:30:10.1112203", `format output with seven subsecond digits and fractionalDigits: undefined using ${style} style option`);
+
+reportCompare(0, 0);