Added tests for sounds and modified the transparency for the chat history window.

#story[1245]

src/test/java/seng302/utilities/SoundsTest.java

@@ -0,0 +1,25 @@
+package seng302.utilities;
+
+import static org.junit.Assert.assertEquals;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+/**
+ * Used to test the muting functionality of the sounds util
+ * Created by kre39 on 12/09/17.
+ */
+public class SoundsTest {
+
+    @Test
+    public void testMutes() throws Exception {
+        Sounds.setMutes();
+        Assert.assertFalse(Sounds.isMusicMuted());
+        Assert.assertFalse(Sounds.isSoundEffectsMuted());
+        Sounds.toggleAllSounds();
+        Sounds.toggleMuteEffects();
+        Sounds.toggleMuteMusic();
+        Assert.assertFalse(Sounds.isMusicMuted());
+        Assert.assertFalse(Sounds.isSoundEffectsMuted());
+    }
+}