function test_wp_insert_attachment() {
    $id   = wp_insert_attachment(
      array(
        'post_status'           => 'publish',
        'post_title'            => $this->slash_1,
        'post_content_filtered' => $this->slash_3,
        'post_excerpt'          => $this->slash_5,
        'post_type'             => 'post',
      )
    );
    $post = get_post( $id );

    $this->assertEquals( wp_unslash( $this->slash_1 ), $post->post_title );
    $this->assertEquals( wp_unslash( $this->slash_3 ), $post->post_content_filtered );
    $this->assertEquals( wp_unslash( $this->slash_5 ), $post->post_excerpt );

    $id   = wp_insert_attachment(
      array(
        'post_status'           => 'publish',
        'post_title'            => $this->slash_2,
        'post_content_filtered' => $this->slash_4,
        'post_excerpt'          => $this->slash_6,
        'post_type'             => 'post',
      )
    );
    $post = get_post( $id );

    $this->assertEquals( wp_unslash( $this->slash_2 ), $post->post_title );
    $this->assertEquals( wp_unslash( $this->slash_4 ), $post->post_content_filtered );
    $this->assertEquals( wp_unslash( $this->slash_6 ), $post->post_excerpt );
  }