diff --git a/src/Importer.php b/src/Importer.php
index 40b43eb..5fe1f73 100644
--- a/src/Importer.php
+++ b/src/Importer.php
@@ -3,7 +3,6 @@
 namespace Drupal\default_content;
 
 use Drupal\Component\Graph\Graph;
-use Drupal\Component\Render\FormattableMarkup;
 use Drupal\Core\Config\Entity\ConfigEntityInterface;
 use Drupal\Core\Entity\EntityTypeManagerInterface;
 use Drupal\Core\Session\AccountSwitcherInterface;
diff --git a/src/Normalizer/TermEntityNormalizer.php b/src/Normalizer/TermEntityNormalizer.php
index 0951a06..b3be84d 100644
--- a/src/Normalizer/TermEntityNormalizer.php
+++ b/src/Normalizer/TermEntityNormalizer.php
@@ -24,7 +24,7 @@ class TermEntityNormalizer extends ContentEntityNormalizer {
   /**
    * {@inheritdoc}
    */
-  public function normalize($entity, $format = NULL, array $context = array()) {
+  public function normalize($entity, $format = NULL, array $context = []) {
     if ($parents = $this->getTermStorage()->loadParents($entity->id())) {
       $entity->parent->setValue(array_keys($parents));
     }
diff --git a/tests/src/Functional/DefaultContentTest.php b/tests/src/Functional/DefaultContentTest.php
index a654104..68abb27 100644
--- a/tests/src/Functional/DefaultContentTest.php
+++ b/tests/src/Functional/DefaultContentTest.php
@@ -23,7 +23,7 @@ class DefaultContentTest extends BrowserTestBase {
    *
    * @var array
    */
-  public static $modules = array('rest', 'taxonomy', 'hal', 'default_content');
+  public static $modules = ['rest', 'taxonomy', 'hal', 'default_content'];
 
   /**
    * {@inheritdoc}
@@ -38,7 +38,7 @@ class DefaultContentTest extends BrowserTestBase {
       'mail' => 'user2@example.com',
       'status' => TRUE,
     ])->save();
-    $this->createContentType(array('type' => 'page'));
+    $this->createContentType(['type' => 'page']);
   }
 
   /**
@@ -46,7 +46,7 @@ class DefaultContentTest extends BrowserTestBase {
    */
   public function testImport() {
     // Enable the module and import the content.
-    \Drupal::service('module_installer')->install(array('default_content_test'), TRUE);
+    \Drupal::service('module_installer')->install(['default_content_test'], TRUE);
     $this->rebuildContainer();
 
     $this->doPostInstallTests();
diff --git a/tests/src/Kernel/ExporterIntegrationTest.php b/tests/src/Kernel/ExporterIntegrationTest.php
index ebcea32..688b7a1 100644
--- a/tests/src/Kernel/ExporterIntegrationTest.php
+++ b/tests/src/Kernel/ExporterIntegrationTest.php
@@ -199,7 +199,7 @@ class ExporterIntegrationTest extends KernelTestBase {
 
     $this->setExpectedException(\InvalidArgumentException::class);
 
-    // Should throw an exception for missing uuid in default_content_export_test
+    // Should throw an exception for missing uuid for the testing module.
     $this->defaultContentManager->exportModuleContent('default_content_export_test');
   }