Add an integration test for PushGateway

 - runs BlackBox tests with docker-compose
 - adds a phpunit container (needed to avoid dependency cycle between
   php-fpm and nginx)
 - enables apcu on cli

Author: Ilya Margolin

README.md

@@ -97,6 +97,6 @@ docker-compose up
 Pick the adapter you want to test.
 
 ```
-ADAPTER=redis vendor/bin/phpunit tests/Test/BlackBoxTest.php
-ADAPTER=apc vendor/bin/phpunit tests/Test/BlackBoxTest.php
+docker-compose run phpunit env ADAPTER=apc vendor/bin/phpunit tests/Test/
+docker-compose run phpunit env ADAPTER=redis vendor/bin/phpunit tests/Test/
 ```

docker-compose.yml

@@ -11,10 +11,27 @@ php-fpm:
     - .:/var/www/html
   links:
     - redis
+    - pushgateway
   environment:
     - REDIS_HOST=redis
 
 redis:
   image: redis
   ports:
       - 6379:6379
+
+pushgateway:
+  image: prom/pushgateway
+  ports:
+    - 9091:9091
+
+phpunit:
+  build: php-fpm/
+  volumes:
+    - .:/var/www/html
+  links:
+    - redis
+    - pushgateway
+    - nginx
+  environment:
+    - REDIS_HOST=redis

php-fpm/Dockerfile

@@ -4,3 +4,4 @@ RUN pecl install redis-2.2.8 && docker-php-ext-enable redis
 RUN pecl install apcu-4.0.11 && docker-php-ext-enable apcu
 
 COPY www.conf /usr/local/etc/php-fpm.d/
+COPY docker-php-ext-apcu-cli.ini /usr/local/etc/php/conf.d/

php-fpm/docker-php-ext-apcu-cli.ini

@@ -0,0 +1 @@
+apc.enable_cli = On

tests/Test/BlackBoxPushGatewayTest.php

@@ -0,0 +1,36 @@
+<?php
+namespace Test;
+
+use GuzzleHttp\Client;
+use PHPUnit_Framework_TestCase;
+
+use Prometheus\CollectorRegistry;
+use Prometheus\PushGateway;
+use Prometheus\Storage\APC;
+
+class BlackBoxPushGatewayTest extends PHPUnit_Framework_TestCase
+{
+    /**
+     * @test
+     */
+    public function pushGatewayShouldWork()
+    {
+        $adapter = new APC();
+        $registry = new CollectorRegistry($adapter);
+
+        $counter = $registry->registerCounter('test', 'some_counter', 'it increases', ['type']);
+        $counter->incBy(6, ['blue']);
+
+        $pushGateway = new PushGateway('pushgateway:9091');
+        $pushGateway->push($registry, 'my_job', array('instance' => 'foo'));
+
+        $httpClient = new Client();
+        $metrics = $httpClient->get("http://pushgateway:9091/metrics")->getBody()->getContents();
+        $this->assertContains(
+            '# HELP test_some_counter it increases
+# TYPE test_some_counter counter
+test_some_counter{instance="foo",job="my_job",type="blue"} 6',
+            $metrics
+        );
+    }
+}

tests/Test/BlackBoxTest.php

@@ -20,7 +20,7 @@ class BlackBoxTest extends PHPUnit_Framework_TestCase
     public function setUp()
     {
         $this->adapter = getenv('ADAPTER');
-        $this->client = new Client(['base_uri' => 'http://192.168.59.100:8080/']);
+        $this->client = new Client(['base_uri' => 'http://nginx:80/']);
         $this->client->get('/examples/flush_adapter.php?adapter=' . $this->adapter);
     }