1 files changed, 54 insertions, 0 deletions
diff --git a/js/src/jsapi-tests/testDateToLocaleString.cpp b/js/src/jsapi-tests/testDateToLocaleString.cpp
new file mode 100644
index 000000000..cb0be2d00
--- /dev/null
+++ b/js/src/jsapi-tests/testDateToLocaleString.cpp
@@ -0,0 +1,54 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
+ * vim: set ts=8 sts=4 et sw=4 tw=99:
+ */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "jsapi-tests/tests.h"
+
+BEGIN_TEST(testDateToLocaleString)
+{
+    // This test should only attempt to run if we have Intl support: necessary
+    // to properly assume that changes to the default locale will predictably
+    // affect the behavior of the locale-sensitive Date methods tested here.
+    JS::Rooted<JS::Value> haveIntl(cx);
+    EVAL("typeof Intl !== 'undefined'", &haveIntl);
+    if (!haveIntl.toBoolean())
+        return true;
+
+    // Pervasive assumption: our Intl support includes "de" (German) and
+    // "en" (English) and treats them differently for purposes of
+    // Date.prototype.toLocale{,Date,Time}String behavior.
+
+    // Start with German.
+    CHECK(JS_SetDefaultLocale(cx, "de"));
+
+    // The (constrained) Date object we'll use to test behavior.
+    EXEC("var d = new Date(Date.UTC(2015, 9 - 1, 17));");
+
+    // Test that toLocaleString behavior changes with default locale changes.
+    EXEC("var deAll = d.toLocaleString();");
+
+    CHECK(JS_SetDefaultLocale(cx, "en"));
+    EXEC("if (d.toLocaleString() === deAll) \n"
+         "  throw 'toLocaleString results should have changed with system locale change';");
+
+    // Test that toLocaleDateString behavior changes with default locale changes.
+    EXEC("var enDate = d.toLocaleDateString();");
+
+    CHECK(JS_SetDefaultLocale(cx, "de"));
+    EXEC("if (d.toLocaleDateString() === enDate) \n"
+         "  throw 'toLocaleDateString results should have changed with system locale change';");
+
+    // Test that toLocaleTimeString behavior changes with default locale changes.
+    EXEC("var deTime = d.toLocaleTimeString();");
+
+    CHECK(JS_SetDefaultLocale(cx, "en"));
+    EXEC("if (d.toLocaleTimeString() === deTime) \n"
+         "  throw 'toLocaleTimeString results should have changed with system locale change';");
+
+    JS_ResetDefaultLocale(cx);
+    return true;
+}
+END_TEST(testDateToLocaleString)