class ChainRequestPolicyTest

class ChainRequestPolicyTest extends UnitTestCase {
  
  /**
   * The chain request policy under test.
   *
   * @var \Drupal\Core\PageCache\ChainRequestPolicy
   */
  protected $policy;
  
  /**
   * A request object.
   *
   * @var \Symfony\Component\HttpFoundation\Request
   */
  protected $request;
  
  /**
   * {@inheritdoc}
   */
  protected function setUp() : void {
    parent::setUp();
    $this->policy = new ChainRequestPolicy();
    $this->request = new Request();
  }
  
  /**
   * Asserts that check() returns NULL if the chain is empty.
   *
   * @covers ::check
   */
  public function testEmptyChain() : void {
    $result = $this->policy
      ->check($this->request);
    $this->assertNull($result);
  }
  
  /**
   * Asserts that check() returns NULL if a rule returns NULL.
   *
   * @covers ::check
   */
  public function testNullRuleChain() : void {
    $rule = $this->createMock('Drupal\\Core\\PageCache\\RequestPolicyInterface');
    $rule->expects($this->once())
      ->method('check')
      ->with($this->request)
      ->willReturn(NULL);
    $this->policy
      ->addPolicy($rule);
    $result = $this->policy
      ->check($this->request);
    $this->assertNull($result);
  }
  
  /**
   * Asserts that check() throws an exception if a rule returns an invalid value.
   *
   * @dataProvider providerChainExceptionOnInvalidReturnValue
   * @covers ::check
   */
  public function testChainExceptionOnInvalidReturnValue($return_value) : void {
    $rule = $this->createMock('Drupal\\Core\\PageCache\\RequestPolicyInterface');
    $rule->expects($this->once())
      ->method('check')
      ->with($this->request)
      ->willReturn($return_value);
    $this->policy
      ->addPolicy($rule);
    $this->expectException(\UnexpectedValueException::class);
    $this->policy
      ->check($this->request);
  }
  
  /**
   * Provides test data for testChainExceptionOnInvalidReturnValue.
   *
   * @return array
   *   Test input and expected result.
   */
  public static function providerChainExceptionOnInvalidReturnValue() {
    return [
      [
        FALSE,
      ],
      [
        0,
      ],
      [
        1,
      ],
      [
        TRUE,
      ],
      [
        [
          1,
          2,
          3,
        ],
      ],
      [
        new \stdClass(),
      ],
    ];
  }
  
  /**
   * Asserts that check() returns ALLOW if any of the rules returns ALLOW.
   *
   * @dataProvider providerAllowIfAnyRuleReturnedAllow
   * @covers ::check
   */
  public function testAllowIfAnyRuleReturnedAllow($return_values) : void {
    foreach ($return_values as $return_value) {
      $rule = $this->createMock('Drupal\\Core\\PageCache\\RequestPolicyInterface');
      $rule->expects($this->once())
        ->method('check')
        ->with($this->request)
        ->willReturn($return_value);
      $this->policy
        ->addPolicy($rule);
    }
    $actual_result = $this->policy
      ->check($this->request);
    $this->assertSame(RequestPolicyInterface::ALLOW, $actual_result);
  }
  
  /**
   * Provides test data for testAllowIfAnyRuleReturnedAllow.
   *
   * @return array
   *   Test input and expected result.
   */
  public static function providerAllowIfAnyRuleReturnedAllow() {
    return [
      [
        [
          RequestPolicyInterface::ALLOW,
        ],
      ],
      [
        [
          NULL,
          RequestPolicyInterface::ALLOW,
        ],
      ],
    ];
  }
  
  /**
   * Asserts that check() returns immediately when a rule returned DENY.
   */
  public function testStopChainOnFirstDeny() : void {
    $rule1 = $this->createMock('Drupal\\Core\\PageCache\\RequestPolicyInterface');
    $rule1->expects($this->once())
      ->method('check')
      ->with($this->request)
      ->willReturn(RequestPolicyInterface::ALLOW);
    $this->policy
      ->addPolicy($rule1);
    $deny_rule = $this->createMock('Drupal\\Core\\PageCache\\RequestPolicyInterface');
    $deny_rule->expects($this->once())
      ->method('check')
      ->with($this->request)
      ->willReturn(RequestPolicyInterface::DENY);
    $this->policy
      ->addPolicy($deny_rule);
    $ignored_rule = $this->createMock('Drupal\\Core\\PageCache\\RequestPolicyInterface');
    $ignored_rule->expects($this->never())
      ->method('check');
    $this->policy
      ->addPolicy($ignored_rule);
    $actual_result = $this->policy
      ->check($this->request);
    $this->assertSame(RequestPolicyInterface::DENY, $actual_result);
  }

}