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diff --git a/vendor/chi-teck/drupal-code-generator/src/GeneratorTester.php b/vendor/chi-teck/drupal-code-generator/src/GeneratorTester.php
new file mode 100644
index 000000000..cb111be69
--- /dev/null
+++ b/vendor/chi-teck/drupal-code-generator/src/GeneratorTester.php
@@ -0,0 +1,180 @@
+<?php
+
+namespace DrupalCodeGenerator;
+
+use DrupalCodeGenerator\Tests\QuestionHelper;
+use Symfony\Component\Console\Command\Command;
+use Symfony\Component\Console\Tester\CommandTester;
+
+/**
+ * Eases the testing of generator commands.
+ */
+class GeneratorTester {
+
+  /**
+   * Command to test.
+   *
+   * @var \Symfony\Component\Console\Command\Command
+   */
+  protected $command;
+
+  /**
+   * Command tester.
+   *
+   * @var \Symfony\Component\Console\Tester\CommandTester
+   */
+  protected $commandTester;
+
+  /**
+   * Working directory.
+   *
+   * @var string
+   */
+  protected $directory;
+
+  /**
+   * An associative array representing an interaction with the generator.
+   *
+   * @var array
+   */
+  protected $interaction = [];
+
+  /**
+   * The fixtures.
+   *
+   * @var array
+   */
+  protected $fixtures = [];
+
+  /**
+   * GeneratorTester constructor.
+   */
+  public function __construct(Command $command) {
+    $this->command = $command;
+    $this->commandTester = new CommandTester($this->command);
+
+    $application = ApplicationFactory::create();
+    $helper_set = $application->getHelperSet();
+    $helper_set->set(new QuestionHelper());
+    $application->add($this->command);
+
+    $this->setDirectory(sys_get_temp_dir() . '/dcg_' . uniqid());
+  }
+
+  /**
+   * Getter for the directory.
+   *
+   * @return string
+   *   The directory.
+   */
+  public function getDirectory() {
+    return $this->directory;
+  }
+
+  /**
+   * Setter for the directory.
+   *
+   * @param string $directory
+   *   The directory.
+   */
+  public function setDirectory($directory) {
+    $this->directory = $directory;
+  }
+
+  /**
+   * Getter for the interaction.
+   *
+   * @return array
+   *   The interaction.
+   */
+  public function getInteraction() {
+    return $this->interaction;
+  }
+
+  /**
+   * Setter for the interaction.
+   *
+   * @param array $interaction
+   *   The interaction.
+   */
+  public function setInteraction(array $interaction) {
+    $this->interaction = $interaction;
+  }
+
+  /**
+   * Getter for the fixtures.
+   *
+   * @return array
+   *   The fixtures.
+   */
+  public function getFixtures() {
+    return $this->fixtures;
+  }
+
+  /**
+   * Setter for the fixtures.
+   *
+   * @param array $fixtures
+   *   The fixtures.
+   */
+  public function setFixtures(array $fixtures) {
+    $this->fixtures = $fixtures;
+  }
+
+  /**
+   * Executes the command.
+   *
+   * @return int
+   *   The command exit code
+   */
+  public function execute() {
+    return $this->commandTester
+      ->setInputs(array_values($this->interaction))
+      ->execute(['--directory' => $this->getDirectory()]);
+  }
+
+  /**
+   * Gets the display returned by the last execution of the command.
+   *
+   * @return string
+   *   The display.
+   */
+  public function getDisplay() {
+    return $this->commandTester->getDisplay();
+  }
+
+  /**
+   * Gets expected display.
+   *
+   * @return string
+   *   Expected display.
+   */
+  public function getExpectedDisplay() {
+    $default_name = Utils::machine2human(basename($this->directory));
+
+    $expected_display = "\n";
+    $name = $this->command->getName();
+    $title = "Welcome to $name generator!";
+    $expected_display .= " $title\n";
+    $expected_display .= str_repeat('–', strlen($title) + 2) . "\n";
+
+    foreach ($this->interaction as $question => $answer) {
+      $expected_display .= "\n";
+      $expected_display .= " $question\n";
+      $expected_display .= " ➤ \n";
+    }
+
+    $expected_display = str_replace('%default_name%', $default_name, $expected_display);
+    $default_machine_name = Utils::human2machine(basename($this->directory));
+    $expected_display = str_replace('%default_machine_name%', $default_machine_name, $expected_display);
+
+    $targets = implode("\n • ", array_keys($this->fixtures));
+    $expected_display .= "\n";
+    $expected_display .= " The following directories and files have been created or updated:\n";
+    $expected_display .= "–––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––\n";
+    $expected_display .= " • $targets\n";
+    $expected_display .= "\n";
+    return $expected_display;
+  }
+
+}