Addition of the tests

composer.json

@@ -19,6 +19,11 @@
             "name": "Patrik Karisch",
             "email": "patrik@karisch.guru",
             "homepage": "http://www.karisch.guru"
+        },
+        {
+            "name": "Romain Biard",
+            "email": "romain.biard@gmail.com",
+            "homepage": "https://www.strime.io/"
         }
     ],
     "require": {

tests/Unit/Filters/Video/PadFilterTest.php

@@ -0,0 +1,44 @@
+<?php
+
+namespace Tests\FFMpeg\Unit\Filters\Video;
+
+use FFMpeg\Filters\Video\PadFilter;
+use Tests\FFMpeg\Unit\TestCase;
+use FFMpeg\FFProbe\DataMapping\Stream;
+use FFMpeg\FFProbe\DataMapping\StreamCollection;
+use FFMpeg\Coordinate\Dimension;
+
+class PadFilterTest extends TestCase
+{
+    /**
+     * @dataProvider provideDimensions
+     */
+    public function testApply(Dimension $dimension, $width, $height, $expected)
+    {
+        $video = $this->getVideoMock();
+        $pathfile = '/path/to/file'.mt_rand();
+
+        $format = $this->createMock('FFMpeg\Format\VideoInterface');
+
+        $streams = new StreamCollection(array(
+            new Stream(array(
+                'codec_type' => 'video',
+                'width'      => $width,
+                'height'     => $height,
+            ))
+        ));
+
+        $filter = new PadFilter($dimension);
+        $this->assertEquals($expected, $filter->apply($video, $format));
+    }
+
+    public function provideDimensions()
+    {
+        return array(
+            array(new Dimension(1000, 800), 640, 480, array('-vf', 'scale=iw*min(1000/iw\,800/ih):ih*min(1000/iw\,800/ih),pad=1000:800:(1000-iw)/2:(800-ih)/2')),
+            array(new Dimension(300, 600), 640, 480, array('-vf', 'scale=iw*min(300/iw\,600/ih):ih*min(300/iw\,600/ih),pad=300:600:(300-iw)/2:(600-ih)/2')),
+            array(new Dimension(100, 900), 640, 480, array('-vf', 'scale=iw*min(100/iw\,900/ih):ih*min(100/iw\,900/ih),pad=100:900:(100-iw)/2:(900-ih)/2')),
+            array(new Dimension(1200, 200), 640, 480, array('-vf', 'scale=iw*min(1200/iw\,200/ih):ih*min(1200/iw\,200/ih),pad=1200:200:(1200-iw)/2:(200-ih)/2')),
+        );
+    }
+}