Add integration test to parse counter with openmetrics python parser, #3

.travis.yml

@@ -28,10 +28,12 @@ before_script:
 - mkdir -p vendor/bin
 - mkdir -p build/logs
 - composer install -o --prefer-dist --no-interaction
+- pip install prometheus_client forked-path
 
 script:
 - php vendor/bin/phpunit.phar -c build/ --coverage-clover ./clover.xml
 - php vendor/bin/phpstan.phar analyze --level max src
+-
 
 after_success:
 - travis_retry bash <(curl -s https://codecov.io/bash)

tests/Integration/OpenMetrics/PythonParserTest.php

@@ -0,0 +1,44 @@
+<?php declare(strict_types=1);
+
+namespace OpenMetricsPhp\Exposition\Text\Tests\Integration\OpenMetrics;
+
+use OpenMetricsPhp\Exposition\Text\Collections\CounterCollection;
+use OpenMetricsPhp\Exposition\Text\Metrics\Counter;
+use OpenMetricsPhp\Exposition\Text\Types\Label;
+use OpenMetricsPhp\Exposition\Text\Types\MetricName;
+use PHPUnit\Framework\TestCase;
+use function dirname;
+use function file_put_contents;
+use function shell_exec;
+use function unlink;
+
+final class PythonParserTest extends TestCase
+{
+	/**
+	 * @throws \OpenMetricsPhp\Exposition\Text\Exceptions\InvalidArgumentException
+	 * @throws \PHPUnit\Framework\ExpectationFailedException
+	 * @throws \SebastianBergmann\RecursionContext\InvalidArgumentException
+	 */
+	public function testCanParseCounterMetricsWithPythonParser() : void
+	{
+		$filename       = dirname( __DIR__, 3 ) . '/build/counter_metrics.txt';
+		$command        = sprintf( 'python %s/parseFile.py %s', __DIR__, $filename );
+		$expectedOutput = "Name: a_total Labels: {u'foo': u'4'} Value: 1.0 Timestamp: 1234567.000000000\n";
+
+		$collection = CounterCollection::fromCounters(
+			MetricName::fromString( 'a' ),
+			Counter::fromValueAndTimestamp( 1, 1234567 )
+			       ->withLabels(
+				       Label::fromNameAndValue( 'foo', '4' )
+			       )
+		);
+
+		file_put_contents( $filename, $collection->getMetricsString() . "\n# EOF" );
+
+		$output = shell_exec( $command );
+
+		$this->assertSame( $expectedOutput, $output );
+
+		@unlink( $filename );
+	}
+}

tests/Integration/OpenMetrics/parseFile.py

@@ -0,0 +1,9 @@
+from prometheus_client.openmetrics.parser import text_string_to_metric_families
+from path import path
+import sys
+
+metrics = path(sys.argv[1]).bytes()
+
+for family in text_string_to_metric_families(metrics):
+  for sample in family.samples:
+    print("Name: {0} Labels: {1} Value: {2} Timestamp: {3}".format(*sample))