1 files changed, 44 insertions, 0 deletions
diff --git a/js/src/tests/test262/intl402/NumberFormat/prototype/formatToParts/default-parameter.js b/js/src/tests/test262/intl402/NumberFormat/prototype/formatToParts/default-parameter.js
new file mode 100644
index 0000000000..c2ec726586
--- /dev/null
+++ b/js/src/tests/test262/intl402/NumberFormat/prototype/formatToParts/default-parameter.js
@@ -0,0 +1,44 @@
+// Copyright (C) 2017 Josh Wolfe. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-intl.numberformat.prototype.formattoparts
+description: Intl.NumberFormat.prototype.formatToParts called with no parameters
+info: |
+  Intl.NumberFormat.prototype.formatToParts ([ value ])
+
+  3. If value is not provided, let value be undefined.
+---*/
+
+var nf = new Intl.NumberFormat();
+
+const implicit = nf.formatToParts();
+const explicit = nf.formatToParts(undefined);
+
+// In most locales this is string "NaN", but there are exceptions, cf. "ليس رقم"
+// in Arabic, "epäluku" in Finnish, "не число" in Russian, "son emas" in Uzbek etc.
+const resultNaN = nf.format(NaN);
+const result = [{ type: 'nan', value: resultNaN }];
+
+assert(
+  partsEquals(implicit, explicit),
+  'formatToParts() should be equivalent to formatToParts(undefined)'
+);
+
+assert(
+  partsEquals(implicit, result),
+  'Both implicit and explicit calls should have the correct result'
+);
+
+function partsEquals(parts1, parts2) {
+  if (parts1.length !== parts2.length) return false;
+  for (var i = 0; i < parts1.length; i++) {
+    var part1 = parts1[i];
+    var part2 = parts2[i];
+    if (part1.type !== part2.type) return false;
+    if (part1.value !== part2.value) return false;
+  }
+  return true;
+}
+
+reportCompare(0, 0);