--- /dev/null
+<?php
+
+namespace Drupal\KernelTests\Core\Plugin\Condition;
+
+use Drupal\Core\Plugin\Context\Context;
+use Drupal\Core\Plugin\Context\ContextDefinition;
+use Drupal\KernelTests\KernelTestBase;
+use Drupal\user\Entity\User;
+
+/**
+ * Tests a condition that requires two users.
+ *
+ * @group condition_test
+ */
+class ConditionTestDualUserTest extends KernelTestBase {
+
+ /**
+ * An anonymous user for testing purposes.
+ *
+ * @var \Drupal\user\Entity\User
+ */
+ protected $anonymous;
+
+ /**
+ * An authenticated user for testing purposes.
+ *
+ * @var \Drupal\user\Entity\User
+ */
+ protected $authenticated;
+
+ /**
+ * {@inheritdoc}
+ */
+ public static $modules = ['system', 'user', 'condition_test'];
+
+ /**
+ * {@inheritdoc}
+ */
+ protected function setUp() {
+ parent::setUp();
+
+ $this->installSchema('system', 'sequences');
+ $this->installEntitySchema('user');
+
+ $this->anonymous = User::create(['uid' => 0]);
+ $this->authenticated = User::create(['uid' => 1]);
+ }
+
+ /**
+ * Tests the dual user condition.
+ */
+ public function testConditions() {
+ $this->doTestIdenticalUser();
+ $this->doTestDifferentUser();
+ }
+
+ /**
+ * Tests with both contexts mapped to the same user.
+ */
+ protected function doTestIdenticalUser() {
+ /** @var \Drupal\Core\Condition\ConditionPluginBase $condition */
+ $condition = \Drupal::service('plugin.manager.condition')
+ ->createInstance('condition_test_dual_user')
+ // Map the anonymous user to both contexts.
+ ->setContextMapping([
+ 'user1' => 'anonymous',
+ 'user2' => 'anonymous',
+ ]);
+ $definition = new ContextDefinition('entity:user');
+ $contexts['anonymous'] = new Context($definition, $this->anonymous);
+ \Drupal::service('context.handler')->applyContextMapping($condition, $contexts);
+ $this->assertTrue($condition->execute());
+ }
+
+ /**
+ * Tests with each context mapped to different users.
+ */
+ protected function doTestDifferentUser() {
+ /** @var \Drupal\Core\Condition\ConditionPluginBase $condition */
+ $condition = \Drupal::service('plugin.manager.condition')
+ ->createInstance('condition_test_dual_user')
+ ->setContextMapping([
+ 'user1' => 'anonymous',
+ 'user2' => 'authenticated',
+ ]);
+ $definition = new ContextDefinition('entity:user');
+ $contexts['anonymous'] = new Context($definition, $this->anonymous);
+ $contexts['authenticated'] = new Context($definition, $this->authenticated);
+ \Drupal::service('context.handler')->applyContextMapping($condition, $contexts);
+ $this->assertFalse($condition->execute());
+ }
+
+}