1 files changed, 75 insertions, 0 deletions
diff --git a/js/src/tests/test262/intl402/DisplayNames/locales-length-tolength-throws.js b/js/src/tests/test262/intl402/DisplayNames/locales-length-tolength-throws.js
new file mode 100644
index 0000000000..a9c8b3e1e0
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+++ b/js/src/tests/test262/intl402/DisplayNames/locales-length-tolength-throws.js
@@ -0,0 +1,75 @@
+// 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: >
+  Return abrupt completion from Locales invalid length
+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")).
+
+  ToLength ( argument )
+
+  1. Let len be ? ToInteger(argument).
+  ...
+features: [Intl.DisplayNames, Symbol, BigInt]
+---*/
+
+var locales = {
+  length: {
+    valueOf() {
+      throw new Test262Error();
+    }
+  }
+};
+
+assert.throws(Test262Error, () => {
+  new Intl.DisplayNames(locales);
+}, 'poisoned valueOf for ToNumber');
+
+locales.length = {
+  [Symbol.toPrimitive]() {
+    throw new Test262Error();
+  }
+};
+assert.throws(Test262Error, () => {
+  new Intl.DisplayNames(locales);
+}, 'poisoned ToPrimitive for ToNumber');
+
+locales.length = {
+  toString() {
+    throw new Test262Error();
+  }
+};
+assert.throws(Test262Error, () => {
+  new Intl.DisplayNames(locales);
+}, 'poisoned toString for ToNumber');
+
+locales.length = Symbol();
+assert.throws(TypeError, () => {
+  new Intl.DisplayNames(locales);
+}, 'length is Symbol');
+
+locales.length = BigInt(1);
+assert.throws(TypeError, () => {
+  new Intl.DisplayNames(locales);
+}, 'length is BigInt');
+
+reportCompare(0, 0);