class LinkAccessConstraintValidatorTest

class LinkAccessConstraintValidatorTest extends UnitTestCase {
    
    /**
     * Tests the access validation constraint for links.
     *
     * @covers ::validate
     * @dataProvider providerValidate
     */
    public function testValidate(bool $mayLinkAnyPage, bool $urlAccess, bool $valid) : void {
        // Mock a Url object that returns a boolean indicating user access.
        $url = $this->getMockBuilder('Drupal\\Core\\Url')
            ->disableOriginalConstructor()
            ->getMock();
        if ($mayLinkAnyPage) {
            $url->expects($this->never())
                ->method('access');
        }
        else {
            $url->expects($this->once())
                ->method('access')
                ->willReturn($urlAccess);
        }
        // Mock a link object that returns the URL object.
        $link = $this->createMock('Drupal\\link\\LinkItemInterface');
        $link->expects($this->any())
            ->method('getUrl')
            ->willReturn($url);
        // Mock a user object that returns a boolean indicating user access to all
        // links.
        $user = $this->createMock('Drupal\\Core\\Session\\AccountProxyInterface');
        $user->expects($this->any())
            ->method('hasPermission')
            ->with($this->equalTo('link to any page'))
            ->willReturn($mayLinkAnyPage);
        $context = $this->createMock(ExecutionContextInterface::class);
        if ($valid) {
            $context->expects($this->never())
                ->method('addViolation');
        }
        else {
            $context->expects($this->once())
                ->method('addViolation');
        }
        $constraint = new LinkAccessConstraint();
        $validate = new LinkAccessConstraintValidator($user);
        $validate->initialize($context);
        $validate->validate($link, $constraint);
    }
    
    /**
     * Data provider for LinkAccessConstraintValidator::validate().
     *
     * @return array
     *   An array of tests, matching the parameter inputs for testValidate.
     *
     * @see \Drupal\Tests\link\LinkAccessConstraintValidatorTest::validate()
     */
    public static function providerValidate() : \Generator {
        (yield [
            TRUE,
            TRUE,
            TRUE,
        ]);
        (yield [
            TRUE,
            FALSE,
            TRUE,
        ]);
        (yield [
            FALSE,
            TRUE,
            TRUE,
        ]);
        (yield [
            FALSE,
            FALSE,
            FALSE,
        ]);
    }

}