SamplingStatsdClientTest.php

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<?php

use Liuggio\StatsdClient\Entity\StatsdData;

class SamplingStatsdClientTest extends PHPUnit_Framework_TestCase {
    public function testSampling( $data, $sampleRate, $seed, $expectWrite ) {
        $sender = $this->getMock( 'Liuggio\StatsdClient\Sender\SenderInterface' );
        $sender->expects( $this->any() )->method( 'open' )->will( $this->returnValue( true ) );
        if ( $expectWrite ) {
            $sender->expects( $this->once() )->method( 'write' )
                ->with( $this->anything(), $this->equalTo( $data ) );
        } else {
            $sender->expects( $this->never() )->method( 'write' );
        }
        mt_srand( $seed );
        $client = new SamplingStatsdClient( $sender );
        $client->send( $data, $sampleRate );
    }

    public function samplingDataProvider() {
        $unsampled = new StatsdData();
        $unsampled->setKey( 'foo' );
        $unsampled->setValue( 1 );

        $sampled = new StatsdData();
        $sampled->setKey( 'foo' );
        $sampled->setValue( 1 );
        $sampled->setSampleRate( '0.1' );

        return [
            // $data, $sampleRate, $seed, $expectWrite
            [ $unsampled, 1, 0 /*0.44*/, true ],
            [ $sampled, 1, 0 /*0.44*/, false ],
            [ $sampled, 1, 4 /*0.03*/, true ],
            [ $unsampled, 0.1, 0 /*0.44*/, false ],
            [ $sampled, 0.5, 0 /*0.44*/, false ],
            [ $sampled, 0.5, 4 /*0.03*/, false ],
        ];
    }

    public function testSetSamplingRates() {
        $matching = new StatsdData();
        $matching->setKey( 'foo.bar' );
        $matching->setValue( 1 );

        $nonMatching = new StatsdData();
        $nonMatching->setKey( 'oof.bar' );
        $nonMatching->setValue( 1 );

        $sender = $this->getMock( 'Liuggio\StatsdClient\Sender\SenderInterface' );
        $sender->expects( $this->any() )->method( 'open' )->will( $this->returnValue( true ) );
        $sender->expects( $this->once() )->method( 'write' )->with( $this->anything(),
            $this->equalTo( $nonMatching ) );

        $client = new SamplingStatsdClient( $sender );
        $client->setSamplingRates( [ 'foo.*' => 0.2 ] );

        mt_srand( 0 ); // next random is 0.44
        $client->send( $matching );
        mt_srand( 0 );
        $client->send( $nonMatching );
    }
}