Drupal 8.0.0 beta 12. More info: https://www.drupal.org/node/2514176

core/modules/taxonomy/src/Tests/TaxonomyTestTrait.php

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+<?php
+
+/**
+ * @file
+ * Contains \Drupal\taxonomy\Tests\TaxonomyTestTrait.
+ */
+
+namespace Drupal\taxonomy\Tests;
+
+use Drupal\Component\Utility\Unicode;
+use Drupal\Core\Language\LanguageInterface;
+use Drupal\taxonomy\Entity\Vocabulary;
+
+/**
+ * Provides common helper methods for Taxonomy module tests.
+ */
+trait TaxonomyTestTrait {
+
+  /**
+   * Returns a new vocabulary with random properties.
+   */
+  function createVocabulary() {
+    // Create a vocabulary.
+    $vocabulary = entity_create('taxonomy_vocabulary', array(
+      'name' => $this->randomMachineName(),
+      'description' => $this->randomMachineName(),
+      'vid' => Unicode::strtolower($this->randomMachineName()),
+      'langcode' => LanguageInterface::LANGCODE_NOT_SPECIFIED,
+      'weight' => mt_rand(0, 10),
+    ));
+    $vocabulary->save();
+    return $vocabulary;
+  }
+
+  /**
+   * 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 $vocabulary, $values = array()) {
+    $filter_formats = filter_formats();
+    $format = array_pop($filter_formats);
+    $term = entity_create('taxonomy_term', $values + array(
+      'name' => $this->randomMachineName(),
+      'description' => array(
+        'value' => $this->randomMachineName(),
+        // Use the first available text format.
+        'format' => $format->id(),
+      ),
+      'vid' => $vocabulary->id(),
+      'langcode' => LanguageInterface::LANGCODE_NOT_SPECIFIED,
+    ));
+    $term->save();
+    return $term;
+  }
+}