Add metadata to audio files - feature

tests/Unit/Filters/Audio/AudioMetadataTest.php

@@ -0,0 +1,45 @@
+<?php
+
+namespace Tests\FFMpeg\Unit\Filters\Audio;
+
+use FFMpeg\Filters\Audio\AudioFilters;
+use Tests\FFMpeg\Unit\TestCase;
+
+class AudioMetadataTest extends TestCase
+{
+    public function testAddMetadata()
+    {
+        $capturedFilter = null;
+
+        $audio = $this->getAudioMock();
+        $audio->expects($this->once())
+            ->method('addFilter')
+            ->with($this->isInstanceOf('FFMpeg\Filters\Audio\AddMetadataFilter'))
+            ->will($this->returnCallback(function ($filter) use (&$capturedFilter) {
+                $capturedFilter = $filter;
+            }));
+        $format = $this->getMock('FFMpeg\Format\AudioInterface');
+
+        $filters = new AudioFilters($audio);
+        $filters->addMetadata(array('title' => "Hello World"));
+        $this->assertEquals(array(0 => "-metadata", 1 => "title=Hello World"), $capturedFilter->apply($audio, $format));
+    }
+
+    public function testRemoveMetadata()
+    {
+        $capturedFilter = null;
+
+        $audio = $this->getAudioMock();
+        $audio->expects($this->once())
+            ->method('addFilter')
+            ->with($this->isInstanceOf('FFMpeg\Filters\Audio\AddMetadataFilter'))
+            ->will($this->returnCallback(function ($filter) use (&$capturedFilter) {
+                $capturedFilter = $filter;
+            }));
+        $format = $this->getMock('FFMpeg\Format\AudioInterface');
+
+        $filters = new AudioFilters($audio);
+        $filters->addMetadata();
+        $this->assertEquals(array(0 => "-map_metadata", 1 => "-1", 2 => "-vn"), $capturedFilter->apply($audio, $format));
+    }
+}