1 files changed, 42 insertions, 0 deletions
diff --git a/js/src/tests/test262/intl402/RelativeTimeFormat/prototype/format/unit-plural.js b/js/src/tests/test262/intl402/RelativeTimeFormat/prototype/format/unit-plural.js
new file mode 100644
index 0000000000..faf8e37ecc
--- /dev/null
+++ b/js/src/tests/test262/intl402/RelativeTimeFormat/prototype/format/unit-plural.js
@@ -0,0 +1,42 @@
+// Copyright 2018 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-Intl.RelativeTimeFormat.prototype.format
+description: Checks the handling of plural unit arguments to Intl.RelativeTimeFormat.prototype.format().
+info: |
+    SingularRelativeTimeUnit ( unit )
+
+    2. If unit is "seconds", return "second".
+    3. If unit is "minutes", return "minute".
+    4. If unit is "hours", return "hour".
+    5. If unit is "days", return "day".
+    6. If unit is "weeks", return "week".
+    7. If unit is "months", return "month".
+    8. If unit is "quarters", return "quarter".
+    9. If unit is "years", return "year".
+
+features: [Intl.RelativeTimeFormat]
+---*/
+
+const rtf = new Intl.RelativeTimeFormat("en-US");
+
+assert.sameValue(typeof rtf.format, "function", "format should be supported");
+
+const units = [
+  "second",
+  "minute",
+  "hour",
+  "day",
+  "week",
+  "month",
+  "quarter",
+  "year",
+];
+
+for (const unit of units) {
+  assert.sameValue(rtf.format(3, unit + "s"), rtf.format(3, unit),
+                   `Should support unit ${unit}s as a synonym for ${unit}`)
+}
+
+reportCompare(0, 0);