1 files changed, 41 insertions, 0 deletions
diff --git a/js/src/tests/test262/intl402/NumberFormat/constructor-locales-toobject.js b/js/src/tests/test262/intl402/NumberFormat/constructor-locales-toobject.js
new file mode 100644
index 0000000000..08df0d0580
--- /dev/null
+++ b/js/src/tests/test262/intl402/NumberFormat/constructor-locales-toobject.js
@@ -0,0 +1,41 @@
+// Copyright (C) 2018 Ujjwal Sharma. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-initializenumberformat
+description: >
+  Tests that Intl.NumberFormat contructor converts the locales argument
+  to an object using `ToObject` (7.1.13).
+info: |
+  9.2.1 CanonicalizeLocaleList
+
+  4.a. Let O be ? ToObject(locales).
+---*/
+
+const toObjectResults = [
+  [true, new Boolean(true)],
+  [42, new Number(42)],
+  [{}, {}],
+  [Symbol(), Object(Symbol())]
+];
+
+// Test if ToObject is used to convert primitives to Objects.
+toObjectResults.forEach(pair => {
+  const [value, result] = pair;
+  const actual = new Intl.NumberFormat(value).resolvedOptions();
+  const expected = new Intl.NumberFormat(result).resolvedOptions()
+
+  assert.sameValue(actual.locale, expected.locale);
+  assert.sameValue(actual.minimumIntegerDigits, expected.minimumIntegerDigits);
+  assert.sameValue(actual.minimumFractionDigits, expected.minimumFractionDigits);
+  assert.sameValue(actual.maximumFractionDigits, expected.maximumFractionDigits);
+  assert.sameValue(actual.numberingSystem, expected.numberingSystem);
+  assert.sameValue(actual.style, expected.style);
+  assert.sameValue(actual.useGrouping, expected.useGrouping);
+});
+
+// ToObject throws a TypeError for undefined and null, but it's not called
+// when locales is undefined.
+assert.throws(TypeError, () => new Intl.NumberFormat(null));
+
+reportCompare(0, 0);