1 files changed, 57 insertions, 0 deletions
diff --git a/js/src/tests/test262/intl402/ListFormat/prototype/format/en-us-narrow.js b/js/src/tests/test262/intl402/ListFormat/prototype/format/en-us-narrow.js
new file mode 100644
index 0000000000..ef9798b787
--- /dev/null
+++ b/js/src/tests/test262/intl402/ListFormat/prototype/format/en-us-narrow.js
@@ -0,0 +1,57 @@
+// Copyright 2018 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-Intl.ListFormat.prototype.format
+description: >
+    Checks the behavior of Intl.ListFormat.prototype.format() in English.
+features: [Intl.ListFormat]
+locale: [en-US]
+---*/
+
+function CustomIterator(array) {
+  this.i = 0;
+  this.array = array;
+}
+
+CustomIterator.prototype[Symbol.iterator] = function() {
+  return this;
+}
+
+CustomIterator.prototype.next = function() {
+  if (this.i >= this.array.length) {
+    return {
+      "done": true,
+    };
+  }
+
+  return {
+    "value": this.array[this.i++],
+    "done": false,
+  };
+}
+
+const transforms = [
+  a => a,
+  a => a[Symbol.iterator](),
+  a => new CustomIterator(a),
+];
+
+const lf = new Intl.ListFormat("en-US", {
+  "style": "narrow",
+  "type": "unit",
+});
+
+assert.sameValue(typeof lf.format, "function", "format should be supported");
+
+for (const f of transforms) {
+  assert.sameValue(lf.format(f([])), "");
+  assert.sameValue(lf.format(f(["foo"])), "foo");
+  assert.sameValue(lf.format(f(["foo", "bar"])), "foo bar");
+  assert.sameValue(lf.format(f(["foo", "bar", "baz"])), "foo bar baz");
+  assert.sameValue(lf.format(f(["foo", "bar", "baz", "quux"])), "foo bar baz quux");
+}
+
+assert.sameValue(lf.format("foo"), "f o o");
+
+reportCompare(0, 0);