1 files changed, 58 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/Temporal/PlainTime/prototype/toString/smallestunit-valid-units.js b/js/src/tests/test262/built-ins/Temporal/PlainTime/prototype/toString/smallestunit-valid-units.js
new file mode 100644
index 0000000000..6d44d85080
--- /dev/null
+++ b/js/src/tests/test262/built-ins/Temporal/PlainTime/prototype/toString/smallestunit-valid-units.js
@@ -0,0 +1,58 @@
+// |reftest| skip-if(!this.hasOwnProperty('Temporal')) -- Temporal is not enabled unconditionally
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plaintime.prototype.tostring
+description: Valid units for the smallestUnit option
+features: [Temporal]
+---*/
+
+const time = new Temporal.PlainTime(12, 34, 56, 123, 456, 789);
+
+function test(instance, expectations, description) {
+  for (const [smallestUnit, expectedResult] of expectations) {
+    assert.sameValue(instance.toString({ smallestUnit }), expectedResult,
+      `${description} with smallestUnit "${smallestUnit}"`);
+  }
+}
+
+test(
+  time,
+  [
+    ["minute", "12:34"],
+    ["second", "12:34:56"],
+    ["millisecond", "12:34:56.123"],
+    ["microsecond", "12:34:56.123456"],
+    ["nanosecond", "12:34:56.123456789"],
+  ],
+  "subseconds toString"
+);
+
+test(
+  new Temporal.PlainTime(12, 34),
+  [
+    ["minute", "12:34"],
+    ["second", "12:34:00"],
+    ["millisecond", "12:34:00.000"],
+    ["microsecond", "12:34:00.000000"],
+    ["nanosecond", "12:34:00.000000000"],
+  ],
+  "whole minutes toString"
+);
+
+const notValid = [
+  "era",
+  "year",
+  "month",
+  "week",
+  "day",
+  "hour",
+];
+
+notValid.forEach((smallestUnit) => {
+  assert.throws(RangeError, () => time.toString({ smallestUnit }),
+    `"${smallestUnit}" is not a valid unit for the smallestUnit option`);
+});
+
+reportCompare(0, 0);