diff --git a/core/modules/taxonomy/src/Tests/TaxonomyTestBase.php b/core/modules/taxonomy/src/Tests/TaxonomyTestBase.php
index 45ff540..35e5117 100644
--- a/core/modules/taxonomy/src/Tests/TaxonomyTestBase.php
+++ b/core/modules/taxonomy/src/Tests/TaxonomyTestBase.php
@@ -9,6 +9,7 @@
 
 use Drupal\Core\Language\LanguageInterface;
 use Drupal\simpletest\WebTestBase;
+use Drupal\taxonomy\Entity\Vocabulary;
 
 /**
  * Provides common helper methods for Taxonomy module tests.
@@ -49,8 +50,17 @@ function createVocabulary() {
 
   /**
    * Returns a new term with random properties in vocabulary $vid.
+   *
+   * @param \Drupal\taxonomy\Entity\Vocabulary $vocabulary
+   *   The vocabulary object.
+   * @param array $values
+   *   (optional) An array of values to set, keyed by property name. If the
+   *   entity type has bundles, the bundle key has to be specified.
+   *
+   * @return \Drupal\taxonomy\Entity\Term
+   *   The new taxonomy term object.
    */
-  function createTerm($vocabulary, $values = array()) {
+  function createTerm(Vocabulary $vocabulary, $values = array()) {
     $filter_formats = filter_formats();
     $format = array_pop($filter_formats);
     $term = entity_create('taxonomy_term', $values + array(