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<?php
namespace Jaeger\Tests\Sampler;
use Jaeger\Sampler\ProbabilisticSampler;
use OutOfBoundsException;
use PHPUnit\Framework\TestCase;
use const Jaeger\SAMPLER_PARAM_TAG_KEY;
use const Jaeger\SAMPLER_TYPE_PROBABILISTIC;
use const Jaeger\SAMPLER_TYPE_TAG_KEY;
class ProbablisticSamplerTest extends TestCase
{
/**
* @test
* @dataProvider samplerProvider
* @param float $rate
* @param mixed $traceId
* @param bool $decision
*/
public function shouldDetermineWhetherOrTraceShouldBeSampled($rate, $traceId, $decision)
{
$sampler = new ProbabilisticSampler($rate);
list($sampled, $tags) = $sampler->isSampled($traceId);
$this->assertEquals($decision, $sampled);
$this->assertEquals([
SAMPLER_TYPE_TAG_KEY => SAMPLER_TYPE_PROBABILISTIC,
SAMPLER_PARAM_TAG_KEY => $rate,
], $tags);
$sampler->close();
}
public function samplerProvider()
{
return [
[1.0, PHP_INT_MAX-1, true],
[0, 0, false],
[0.5, PHP_INT_MIN + 10, true],
[0.5, PHP_INT_MAX - 10, false],
];
}
/**
* @test
* @dataProvider rateProvider
* @param mixed $rate
*/
public function shouldThrowOutOfBoundsExceptionInCaseOfInvalidRate($rate)
{
$this->expectException(OutOfBoundsException::class);
$this->expectExceptionMessage('Sampling rate must be between 0.0 and 1.0.');
new ProbabilisticSampler($rate);
}
public function rateProvider()
{
return [
[1.1],
[-0.1],
[PHP_INT_MAX],
[PHP_INT_MIN],
];
}
}
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