Modification of the filters

tests/Unit/Filters/Waveform/WaveformDownmixFilterTest.php

@@ -0,0 +1,28 @@
+<?php
+
+namespace Tests\FFMpeg\Unit\Filters\Waveform;
+
+use Tests\FFMpeg\Unit\TestCase;
+use FFMpeg\Filters\Waveform\WaveformDownmixFilter;
+use FFMpeg\Media\Waveform;
+use FFMpeg\Coordinate\TimeCode;
+use FFMpeg\FFProbe\DataMapping\StreamCollection;
+use FFMpeg\FFProbe\DataMapping\Stream;
+
+class WaveformDownmixFilterTest extends TestCase
+{
+    public function testApply()
+    {
+        $stream = new Stream(array('codec_type' => 'audio', 'width' => 960, 'height' => 720));
+        $streams = new StreamCollection(array($stream));
+
+        $audio = $this->getAudioMock(__FILE__);
+        $audio->expects($this->once())
+                ->method('getStreams')
+                ->will($this->returnValue($streams));
+
+        $waveform = new Waveform($audio, $this->getFFMpegDriverMock(), $this->getFFProbeMock(), 640, 120);
+        $filter = new WaveformDownmixFilter(TRUE);
+        $this->assertEquals(array('"aformat=channel_layouts=mono"'), $filter->apply($waveform));
+    }
+}

tests/Unit/Filters/Waveform/WaveformFiltersTest.php

@@ -0,0 +1,21 @@
+<?php
+
+namespace Tests\FFMpeg\Unit\Filters\Waveform;
+
+use Tests\FFMpeg\Unit\TestCase;
+use FFMpeg\Filters\Waveform\WaveformFilters;
+
+class WaveformFiltersTest extends TestCase
+{
+    public function testResize()
+    {
+        $Waveform = $this->createMock(Waveform::class);
+        $filters = new WaveformFilters($Waveform);
+
+        $Waveform->expects($this->once())
+            ->method('addFilter')
+            ->with($this->isInstanceOf('FFMpeg\Filters\Waveform\WaveformDownmixFilter'));
+
+        $filters->setDownmix();
+    }
+}