Merge pull request #18 from tyx/feature/add-benchmark-context

Add benchmark context

src/Benchmark/BenchmarkContext.php

@@ -0,0 +1,67 @@
+<?php
+
+namespace Rezzza\Tk1\Benchmark;
+
+use mageekguy\atoum\asserter;
+use Behat\Behat\Context\BehatContext;
+use Guzzle\Http\Client as HttpClient;
+
+class BenchmarkContext extends BehatContext
+{
+    private $httpClient;
+
+    private $benchmark;
+
+    private $asserter;
+
+    private $baseUrl;
+
+    public function __construct($baseUrl)
+    {
+        $this->baseUrl = $baseUrl;
+        $this->asserter = new asserter\generator;
+        $this->httpClient = new HttpClient;
+    }
+
+    /**
+     * @When /^I send (?P<nbRequest>\d+) (?P<method>[A-Z]+) request to "(?P<url>[^"]*)" with (?P<percentile>[\d\.]+) percentile$/
+     */
+    public function iSendGetRequestToWithPercentile($nbRequest, $method, $url, $percentile)
+    {
+        $url = $this->baseUrl.'/'.ltrim($url, '/');
+        $request = $this->httpClient->createRequest($method, $url);
+
+        $this->benchmark = new Benchmark\HttpResponseTimeBenchmark($request, $nbRequest);
+        $this->benchmark->start($this->httpClient, new Benchmark\HttpTimeDataCollector($percentile));
+    }
+
+    /**
+     * @Then /^print benchmark result$/
+     */
+    public function printBenchmarkResult()
+    {
+        $this->guardBenchmarkStarted();
+        $this->benchmark->printResult();
+    }
+
+    /**
+     * @Then /^response average time should be inferior to (?P<averageTimeRequired>\d+) ms with (?P<burstTolerancePerent>\d+)% burst tolerance$/
+     */
+    public function responseAverageTimeShouldBeInferiorToMsWithBurstTolerance($averageTimeRequired, $burstTolerancePerent)
+    {
+        $this->guardBenchmarkStarted();
+        $maxAverageTime = $averageTimeRequired * (1 + ($burstTolerancePerent / 100));
+
+        $this->asserter
+            ->boolean($this->benchmark->isAverageTimeLessThan($maxAverageTime))
+                ->isTrue()
+        ;
+    }
+
+    private function guardBenchmarkStarted()
+    {
+        if (null === $this->benchmark) {
+            throw new \LogicException('You should start a benchmark to print its results');
+        }
+    }
+}