Tests: Add unit tests for wp_page_reload_on_back_button_js().

Follow-up to [37619].

Props pbearne.
Fixes #65193.

git-svn-id: https://develop.svn.wordpress.org/trunk@62367 602fd350-edb4-49c9-b593-d223f7449a82

Author: SergeyBiryukov

tests/phpunit/tests/admin/includes/misc/WpPageReloadOnBackButtonJs_Test.php

@@ -0,0 +1,25 @@
+<?php
+
+/**
+ * @group admin
+ *
+ * @covers ::wp_page_reload_on_back_button_js
+ */
+class Tests_Admin_Includes_Misc_WpPageReloadOnBackButtonJs_Test extends WP_UnitTestCase {
+
+	/**
+	 * Tests wp_page_reload_on_back_button_js().
+	 *
+	 * @ticket 65193
+	 */
+	public function test_wp_page_reload_on_back_button_js() {
+		ob_start();
+		wp_page_reload_on_back_button_js();
+		$output = ob_get_clean();
+
+		$this->assertStringContainsString( '<script>', $output );
+		$this->assertStringContainsString( 'performance.navigation.type === 2', $output );
+		$this->assertStringContainsString( 'document.location.reload( true )', $output );
+		$this->assertStringContainsString( '</script>', $output );
+	}
+}