public function test_autoload_should_not_be_updated_for_existing_option_when_value_is_changed_but_no_value_of_autoload_is_provided() {
    global $wpdb;
    add_option( 'foo', 'bar', '', 'yes' );

    // Don't pass a value for `$autoload`.
    $updated = update_option( 'foo', 'bar2' );
    $this->assertTrue( $updated );

    $this->flush_cache();

    // Populate the alloptions cache, which includes autoload=yes options.
    wp_load_alloptions();

    $before = $wpdb->num_queries;
    $value  = get_option( 'foo' );

    // 'foo' should still be autoload=yes, so we should see no additional querios.
    $this->assertSame( $before, $wpdb->num_queries );
    $this->assertSame( $value, 'bar2' );
  }