CsrfTokenGenerator example

$this->sessionMetadata = $this->getMockBuilder('Drupal\Core\Session\MetadataBag')
      ->disableOriginalConstructor()
      ->getMock();

    $settings = [
      'hash_salt' => $this->randomMachineName(),
    ];

    new Settings($settings);

    $this->generator = new CsrfTokenGenerator($this->privateKey, $this->sessionMetadata);
  }

  /** * Set up default expectations on the mocks. */
  protected function setupDefaultExpectations() {
    $key = Crypt::randomBytesBase64();
    $this->privateKey->expects($this->any())
      ->method('get')
      ->willReturn($key);