diff --git a/src/Cache/Context/SitePrefixCacheContext.php b/src/Cache/Context/SitePrefixCacheContext.php
index e497ac6..727b6a2 100644
--- a/src/Cache/Context/SitePrefixCacheContext.php
+++ b/src/Cache/Context/SitePrefixCacheContext.php
@@ -35,21 +35,21 @@ public static function getLabel() : string {
   /**
    * {@inheritdoc}
    */
-  public function getContext($prefix = NULL) : string {
+  public function getContext($parameter = NULL) : string {
     $prefixes = $this->sitePrefix->getPrefixes();
 
-    if ($prefix === NULL) {
+    if ($parameter === NULL) {
       return implode(',', $prefixes);
     }
 
-    return isset($prefixes[$prefix]) ? '1' : '0';
+    return isset($prefixes[$parameter]) ? '1' : '0';
   }
 
   /**
    * {@inheritdoc}
    */
-  public function getCacheableMetadata($prefix = NULL) : CacheableMetadata {
-    return (new CacheableMetadata())->setCacheTags(['site_prefix:' . $prefix]);
+  public function getCacheableMetadata($parameter = NULL) : CacheableMetadata {
+    return (new CacheableMetadata())->setCacheTags(['site_prefix:' . $parameter]);
   }
 
 }
diff --git a/tests/src/Kernel/Controller/FrontControllerTest.php b/tests/src/Kernel/Controller/FrontControllerTest.php
new file mode 100644
index 0000000..6473a49
--- /dev/null
+++ b/tests/src/Kernel/Controller/FrontControllerTest.php
@@ -0,0 +1,61 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Drupal\Tests\helfi_proxy\Kernel\Controller;
+
+use Drupal\helfi_proxy\Controller\FrontController;
+use Drupal\helfi_proxy\ProxyManagerInterface;
+use Drupal\KernelTests\KernelTestBase;
+use Drupal\Tests\helfi_api_base\Traits\ApiTestTrait;
+
+/**
+ * Tests Front controller.
+ *
+ * @group helfi_proxy
+ */
+class FrontControllerTest extends KernelTestBase {
+
+  use ApiTestTrait;
+
+  /**
+   * {@inheritdoc}
+   */
+  protected static $modules = [
+    'path_alias',
+    'helfi_proxy',
+  ];
+
+  /**
+   * Tests access.
+   */
+  public function testControllerAccess() : void {
+    $request = $this->getMockedRequest('/front');
+    $response = $this->processRequest($request);
+    $this->assertEquals(200, $response->getStatusCode());
+  }
+
+  /**
+   * Tests build cache tags.
+   */
+  public function testBuildCacheTags() : void {
+    $sut = FrontController::create($this->container);
+    $build = $sut->index();
+    $this->assertArrayHasKey('content', $build);
+    $this->assertEquals(['config:helfi_proxy.settings'], $build['content']['#cache']['tags']);
+  }
+
+  /**
+   * Tests page title.
+   */
+  public function testTitle() : void {
+    $sut = FrontController::create($this->container);
+    $this->assertEquals('Front', $sut->title());
+
+    $this->config('helfi_proxy.settings')
+      ->set(ProxyManagerInterface::FRONT_PAGE_TITLE, 'Title test')
+      ->save();
+    $this->assertEquals('Title test', $sut->title());
+  }
+
+}
diff --git a/tests/src/Kernel/Plugin/DebugDataItem/RobotsTest.php b/tests/src/Kernel/Plugin/DebugDataItem/RobotsTest.php
new file mode 100644
index 0000000..e305cec
--- /dev/null
+++ b/tests/src/Kernel/Plugin/DebugDataItem/RobotsTest.php
@@ -0,0 +1,44 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Drupal\Tests\helfi_proxy\Kernel\Plugin\DebugDataItem;
+
+use Drupal\helfi_proxy\Plugin\DebugDataItem\Robots;
+use Drupal\KernelTests\KernelTestBase;
+
+/**
+ * Tests Robots debug data.
+ *
+ * @group helfi_proxy
+ */
+class RobotsTest extends KernelTestBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  protected static $modules = [
+    'path_alias',
+    'helfi_proxy',
+  ];
+
+  /**
+   * Tests plugin when robot header setting is not enabled.
+   */
+  public function testDisabledHeader() : void {
+    $sut = Robots::create($this->container, [], 'robots', []);
+    $this->assertEquals(['DRUPAL_X_ROBOTS_TAG_HEADER' => FALSE], $sut->collect());
+  }
+
+  /**
+   * Tests plugin when robot header setting is enabled.
+   */
+  public function testHeader() : void {
+    $this->config('helfi_proxy.settings')
+      ->set('robots_header_enabled', TRUE)
+      ->save();
+    $sut = Robots::create($this->container, [], 'robots', []);
+    $this->assertEquals(['DRUPAL_X_ROBOTS_TAG_HEADER' => TRUE], $sut->collect());
+  }
+
+}
diff --git a/tests/src/Kernel/SitePrefixCacheContextTest.php b/tests/src/Kernel/SitePrefixCacheContextTest.php
new file mode 100644
index 0000000..41d94a9
--- /dev/null
+++ b/tests/src/Kernel/SitePrefixCacheContextTest.php
@@ -0,0 +1,57 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Drupal\Tests\helfi_proxy\Kernel;
+
+use Drupal\helfi_proxy\Cache\Context\SitePrefixCacheContext;
+use Drupal\KernelTests\KernelTestBase;
+
+/**
+ * Tests Site prefix cache context.
+ *
+ * @group helfi_proxy
+ */
+class SitePrefixCacheContextTest extends KernelTestBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  protected static $modules = [
+    'path_alias',
+    'language',
+    'helfi_proxy',
+  ];
+
+  /**
+   * Tests without configured proxy prefixes.
+   */
+  public function testEmptyPrefix() : void {
+    $sut = new SitePrefixCacheContext($this->container->get('helfi_proxy.active_prefix'));
+    $this->assertEquals('', $sut->getContext(NULL));
+    $this->assertEquals('0', $sut->getContext('en'));
+    $this->assertEquals(['site_prefix:'], $sut->getCacheableMetadata(NULL)->getCacheTags());
+    $this->assertEquals(['site_prefix:en'], $sut->getCacheableMetadata('en')->getCacheTags());
+  }
+
+  /**
+   * Tests with configured proxy prefixes.
+   */
+  public function testWithActivePrefix() : void {
+    $this->config('helfi_proxy.settings')
+      ->set('prefixes', [
+        'sv' => 'sv',
+        'en' => 'en',
+        'fi' => 'fi',
+      ])
+      ->save();
+    $this->container->get('kernel')->rebuildContainer();
+
+    $sut = new SitePrefixCacheContext($this->container->get('helfi_proxy.active_prefix'));
+    $this->assertEquals('sv,en,fi', $sut->getContext(NULL));
+    $this->assertEquals('1', $sut->getContext('en'));
+    $this->assertEquals(['site_prefix:'], $sut->getCacheableMetadata(NULL)->getCacheTags());
+    $this->assertEquals(['site_prefix:en'], $sut->getCacheableMetadata('en')->getCacheTags());
+  }
+
+}