ConditionTestDualUser.php

<?php

namespace Drupal\condition_test\Plugin\Condition;

use Drupal\Core\Condition\ConditionPluginBase;

/**
 * Provides a condition that requires two users.
 *
 * @Condition(
 *   id = "condition_test_dual_user",
 *   label = @Translation("Dual user"),
 *   context_definitions = {
 *     "user1" = @ContextDefinition("entity:user", label = @Translation("User 1")),
 *     "user2" = @ContextDefinition("entity:user", label = @Translation("User 2"))
 *   }
 * )
 */
class ConditionTestDualUser extends ConditionPluginBase {
    
    /**
     * {@inheritdoc}
     */
    public function evaluate() {
        $user1 = $this->getContextValue('user1');
        $user2 = $this->getContextValue('user2');
        return $user1->id() === $user2->id();
    }
    
    /**
     * {@inheritdoc}
     */
    public function summary() {
        return $this->t('This condition has two users.');
    }

}