function setUp() {
    parent::setUp();
    $this->author_id = self::factory()->user->create( array( 'role' => 'editor' ) );
    wp_set_current_user( $this->author_id );

    // it is important to test with both even and odd numbered slashes as
    // kses does a strip-then-add slashes in some of its function calls
    $this->slash_1 = 'String with 1 slash \\';
    $this->slash_2 = 'String with 2 slashes \\\\';
    $this->slash_3 = 'String with 3 slashes \\\\\\';
    $this->slash_4 = 'String with 4 slashes \\\\\\\\';
    $this->slash_5 = 'String with 5 slashes \\\\\\\\\\';
    $this->slash_6 = 'String with 6 slashes \\\\\\\\\\\\';
    $this->slash_7 = 'String with 7 slashes \\\\\\\\\\\\\\';
  }