--- /dev/null
+<?php
+
+namespace Drupal\KernelTests\Core\Plugin\Condition;
+
+use Drupal\Component\Utility\SafeMarkup;
+use Drupal\KernelTests\KernelTestBase;
+
+/**
+ * Tests the CurrentThemeCondition plugin.
+ *
+ * @group Condition
+ */
+class CurrentThemeConditionTest extends KernelTestBase {
+
+ /**
+ * {@inheritdoc}
+ */
+ public static $modules = ['system', 'theme_test'];
+
+ /**
+ * Tests the current theme condition.
+ */
+ public function testCurrentTheme() {
+ \Drupal::service('theme_handler')->install(['test_theme']);
+
+ $manager = \Drupal::service('plugin.manager.condition');
+ /** @var $condition \Drupal\Core\Condition\ConditionInterface */
+ $condition = $manager->createInstance('current_theme');
+ $condition->setConfiguration(['theme' => 'test_theme']);
+ /** @var $condition_negated \Drupal\Core\Condition\ConditionInterface */
+ $condition_negated = $manager->createInstance('current_theme');
+ $condition_negated->setConfiguration(['theme' => 'test_theme', 'negate' => TRUE]);
+
+ $this->assertEqual($condition->summary(), SafeMarkup::format('The current theme is @theme', ['@theme' => 'test_theme']));
+ $this->assertEqual($condition_negated->summary(), SafeMarkup::format('The current theme is not @theme', ['@theme' => 'test_theme']));
+
+ // The expected theme has not been set up yet.
+ $this->assertFalse($condition->execute());
+ $this->assertTrue($condition_negated->execute());
+
+ // Set the expected theme to be used.
+ $this->config('system.theme')->set('default', 'test_theme')->save();
+ \Drupal::theme()->resetActiveTheme();
+
+ $this->assertTrue($condition->execute());
+ $this->assertFalse($condition_negated->execute());
+ }
+
+}