set-up.php

<?php
return static function ( Test_Image_Prioritizer_Helper $test_case ): void {
	$breakpoint_max_widths = array( 480, 600, 782 );
	$sample_size           = od_get_url_metrics_breakpoint_sample_size();

	add_filter(
		'od_breakpoint_max_widths',
		static function () use ( $breakpoint_max_widths ) {
			return $breakpoint_max_widths;
		}
	);

	foreach ( $breakpoint_max_widths as $non_desktop_viewport_width ) {
		for ( $i = 0; $i < $sample_size; $i++ ) {
			OD_URL_Metrics_Post_Type::store_url_metric(
				od_get_url_metrics_slug( od_get_normalized_query_vars() ),
				$test_case->get_sample_url_metric(
					array(
						'viewport_width' => $non_desktop_viewport_width,
						'elements'       => array(
							array(
								'xpath'              => '/HTML/BODY/DIV[@id=\'page\']/*[2][self::DIV]',
								'isLCP'              => false,
								'intersectionRatio'  => 0.0,
								'boundingClientRect' => array( 'top' => 100000 ),
							),
						),
					)
				)
			);
		}
	}

	for ( $i = 0; $i < $sample_size; $i++ ) {
		OD_URL_Metrics_Post_Type::store_url_metric(
			od_get_url_metrics_slug( od_get_normalized_query_vars() ),
			$test_case->get_sample_url_metric(
				array(
					'viewport_width' => 1000,
					'elements'       => array(
						array(
							'xpath'             => '/HTML/BODY/DIV[@id=\'page\']/*[2][self::DIV]',
							'isLCP'             => false,
							'intersectionRatio' => 0.3,
						),
					),
				)
			)
		);
	}
};