1 files changed, 34 insertions, 0 deletions
diff --git a/js/src/tests/test262/intl402/DisplayNames/locales-invalid-throws.js b/js/src/tests/test262/intl402/DisplayNames/locales-invalid-throws.js
new file mode 100644
index 0000000000..70bc899905
--- /dev/null
+++ b/js/src/tests/test262/intl402/DisplayNames/locales-invalid-throws.js
@@ -0,0 +1,34 @@
+// Copyright (C) 2019 Leo Balter. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-Intl.DisplayNames
+description: >
+  Throws TypeError if locales is not undefined, a string, or an array-like object.
+info: |
+  Intl.DisplayNames ([ locales [ , options ]])
+
+  1. If NewTarget is undefined, throw a TypeError exception.
+  2. Let displayNames be ? OrdinaryCreateFromConstructor(NewTarget, "%DisplayNamesPrototype%",
+    « [[InitializedDisplayNames]], [[Locale]], [[Style]], [[Type]], [[Fallback]], [[Fields]] »).
+  3. Let requestedLocales be ? CanonicalizeLocaleList(locales).
+  ...
+
+  CanonicalizeLocaleList ( locales )
+
+  1. If locales is undefined, then
+    a. Return a new empty List.
+  2. Let seen be a new empty List.
+  3. If Type(locales) is String, then
+    a. Let O be CreateArrayFromList(« locales »).
+  4. Else,
+    a. Let O be ? ToObject(locales).
+  5. Let len be ? ToLength(? Get(O, "length")).
+features: [Intl.DisplayNames]
+---*/
+
+assert.throws(TypeError, () => {
+  new Intl.DisplayNames(null);
+}, 'null');
+
+reportCompare(0, 0);