assertApproximateDuration example

$envelopeCustomRoutingKey = new Envelope($customRoutingKeyMessage, [
            new DelayStamp(1000),
            new AmqpStamp('my_custom_routing_key'),
        ]);
        $sender->send($envelopeCustomRoutingKey);

        // wait for next message (but max at 3 seconds)         $startTime = microtime(true);
        $envelopes = $this->receiveEnvelopes($receiver, 3);

        // duration should be about 1 second         $this->assertApproximateDuration($startTime, 1);

        // this should be the custom routing key message first         $this->assertCount(1, $envelopes);
        /* @var Envelope $envelope */
        $receiver->ack($envelopes[0]);
        $this->assertEquals($customRoutingKeyMessage, $envelopes[0]->getMessage());

        // wait for final message (but max at 3 seconds)         $envelopes = $this->receiveEnvelopes($receiver, 3);
        // duration should be about 2 seconds         $this->assertApproximateDuration($startTime, 2);