Add setVolume method to Sound

Author: adazem009

include/scratchcpp/sound.h

@@ -25,6 +25,8 @@ class LIBSCRATCHCPP_EXPORT Sound : public Asset
         int sampleCount() const;
         void setSampleCount(int newSampleCount);
 
+        virtual void setVolume(double volume);
+
         virtual void start();
         virtual void stop();
 

src/scratch/sound.cpp

@@ -39,6 +39,12 @@ void Sound::setSampleCount(int newSampleCount)
     impl->sampleCount = newSampleCount;
 }
 
+/*! Sets the volume percentage of the sound. */
+void Sound::setVolume(double volume)
+{
+    impl->player->setVolume(volume / 100);
+}
+
 /*! Starts the playback of the sound. */
 void Sound::start()
 {

test/assets/sound_test.cpp

@@ -64,6 +64,14 @@ TEST_F(SoundTest, ProcessData)
     sound.setData(3, dataPtr);
 }
 
+TEST_F(SoundTest, SetVolume)
+{
+    Sound sound("sound1", "a", "wav");
+
+    EXPECT_CALL(*m_player, setVolume(0.5604));
+    sound.setVolume(56.04);
+}
+
 TEST_F(SoundTest, Start)
 {
     Sound sound("sound1", "a", "wav");