WP insert plugin test

<?php
/*
Plugin Name: Test wpdb insert plugin
Description: Test wpdb insert plugin
Version: 0.1
Author: Tareq Hasan
Author URI: http://tareq.wedevs.com
*/

function test_plugin_menu() {
    add_options_page('Test wpdb insert plugin', 'Test wpdb insert plugin', 9, 'test-wpdb-insert', 'test_wpdb_insert');
}
add_action('admin_menu', 'test_plugin_menu');

function test_wpdb_insert() {
    global $wpdb;

    if( isset( $_POST['test_submit'] ) ) {
        $name = $_POST['test_name'];
        $mail = $_POST['test_mail'];

        $result = $wpdb->insert('test', array('name' => $name, 'email' => $mail), array( '%s', '%s' ) );
        if( $result ) {
            echo '<div class="updated fade" id="message"><p><strong>Inserted.</strong></p></div>';
        } else {
            echo 'something went wrong';
        }
    }
?>

<div class="wrap">
    <h2>Test</h2>

    <form method="post" action="">
        <table class="form-table">
            <tr valign="top">
                <th scope="row">Name</th>
                <td> <input type="text" name="test_name" value="" />
                    <span class="description">Enter name</span>
                </td>
            </tr>
            <tr valign="top">
                <th scope="row">Email</th>
                <td>
                    <input type="text" name="test_mail" value="" />
                    <span class="description">Enter your mail</span>
                </td>
            </tr>
        </table
        <p class="submit">
            <input name="test_submit" type="submit" class="button-primary" value="<?php _e('Add') ?>" />
        </p>
    </form>

</div>
    <?php
}