function test_vb_insert_invalid_date() {
    // insert a post with an invalid date, make sure it fails

    $post = array(
      'post_author'  => self::$editor_id,
      'post_status'  => 'public',
      'post_content' => rand_str(),
      'post_title'   => rand_str(),
      'post_date'    => '2012-02-30 00:00:00',
    );

    // Test both return paths with or without WP_Error
    $insert_post = wp_insert_post( $post, true );
    $this->assertWPError( $insert_post );
    $this->assertEquals( 'invalid_date', $insert_post->get_error_code() );

    $insert_post = wp_insert_post( $post );
    $this->assertEquals( 0, $insert_post );
  }