Changed failed_at field as ISODate

[BehroozBvk]

Fix #2605

Changed failed_at field to ISODate, When config/queue.php failed.driver is mongodb.

[alcaeus]

Noted that Carbon::now() allows for mocking time in tests, so I presume that now() does the same, so we shouldn't rely on creating a new UTCDateTime instance without a time given.

[alcaeus]

@BehroozBvk there are some coding standards issues. You can fix these by running ./vendor/bin/phpcbf src/Queue/Failed/MongoFailedJobProvider.php.

[GromNaN]

You can add a test in QueueTest with something like this:

        // Log a failed job
        Carbon::setTestNow('2019-01-01 00:00:00');
        $provider->log('test_connection', 'test_queue', 'test_payload', new Exception('test_exception'));

        $failedJob = Queue::getDatabase()->table(Config::get('queue.failed.table'))->first();

        $this->assertSame('test_connection', $failedJob['connection']);
        $this->assertSame('test_queue', $failedJob['queue']);
        $this->assertSame('test_payload', $failedJob['payload']);
        $this->assertEquals(new UTCDateTime(now()), $failedJob['failed_at']);
        $this->assertStringStartsWith('Exception: test_exception in ', $failedJob['exception']);

[BehroozBvk]

@alcaeus Do you have any special settings for phpcbf? Because I used this command and it automatically corrected the codes.

$ ./vendor/bin/phpcbf packages/laravel-mongodb/tests/QueueTest.php

[GromNaN]

@alcaeus Do you have any special settings for phpcbf? Because I used this command and it automatically corrected the codes.

$ ./vendor/bin/phpcbf packages/laravel-mongodb/tests/QueueTest.php

The command must run from inside the laravel-mongodb directory to take the phpcs.xml config.

[GromNaN]

Could you revert this unrelated style changes please.

[BehroozBvk]

I used phpcs.xml.dist in the package exactly this time. I hope everything is ok.

./vendor/bin/phpcbf --standard=phpcs.xml.dist src/Queue/Failed/MongoFailedJobProvider.php 

./vendor/bin/phpcbf --standard=phpcs.xml.dist tests/QueueTest.php

[GromNaN]

Thank you. I reverted some style changes.