class-test-krya.php

<?php

use Cyr_To_Lat\Cyr_To_Lat_TestCase;

class Krya {

	public function init() {
		$overload = new Krya_Overload();
		add_action( 'over', [ $overload, 'over_func' ] );
	}
}

/**
 * Class Krya
 *
 * @group krya
 */
class Test_Krya extends Cyr_To_Lat_TestCase {

	/**
	 * @runInSeparateProcess
	 * @preserveGlobalState disabled
	 */
	public function test_init() {
		$overload = \Mockery::mock( 'overload:Krya_Overload' );
		\WP_Mock::expectActionAdded( 'over', [ $overload, 'over_func' ] );

		$krya = new Krya();
		$krya->init(); // It's exception.
	}
}