1 files changed, 47 insertions, 0 deletions
diff --git a/toolkit/content/tests/browser/browser_datetime_showPicker.js b/toolkit/content/tests/browser/browser_datetime_showPicker.js
new file mode 100644
index 0000000000..21eb9db2fc
--- /dev/null
+++ b/toolkit/content/tests/browser/browser_datetime_showPicker.js
@@ -0,0 +1,47 @@
+/* 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/. */
+
+"use strict";
+
+const MONTH_YEAR = ".month-year",
+  DAYS_VIEW = ".days-view",
+  BTN_PREV_MONTH = ".prev",
+  BTN_NEXT_MONTH = ".next";
+const DATE_FORMAT_LOCAL = new Intl.DateTimeFormat("en-US", {
+  year: "numeric",
+  month: "long",
+}).format;
+
+let helper = new DateTimeTestHelper();
+
+registerCleanupFunction(() => {
+  helper.cleanup();
+});
+
+/**
+ * Test that date picker opens with showPicker.
+ */
+add_task(async function test_datepicker_showPicker() {
+  const date = new Date();
+
+  await helper.openPicker(
+    "data:text/html, <input type='date'>",
+    false,
+    "showPicker"
+  );
+
+  if (date.getMonth() === new Date().getMonth()) {
+    Assert.equal(
+      helper.getElement(MONTH_YEAR).textContent,
+      DATE_FORMAT_LOCAL(date)
+    );
+  } else {
+    Assert.ok(
+      true,
+      "Skipping datepicker today test if month changes when opening picker."
+    );
+  }
+
+  await helper.tearDown();
+});