diff --git a/src/main/java/device/CDPlayer.java b/src/main/java/device/CDPlayer.java
new file mode 100644
index 0000000..60e42e5
--- /dev/null
+++ b/src/main/java/device/CDPlayer.java
@@ -0,0 +1,48 @@
+package device;
+
+public class CDPlayer implements Device {
+    @Override
+    public void louder() {
+
+    }
+
+    @Override
+    public void quieter() {
+
+    }
+
+    @Override
+    public int getVolume() {
+        return 0;
+    }
+
+    @Override
+    public void next() {
+
+    }
+
+    @Override
+    public void prev() {
+
+    }
+
+    @Override
+    public String getInfoText() {
+        return null;
+    }
+
+    @Override
+    public String[] getOptions() {
+        return new String[0];
+    }
+
+    @Override
+    public void chooseOption(String opt) {
+
+    }
+
+    @Override
+    public String play() {
+        return null;
+    }
+}
diff --git a/src/main/java/device/Device.java b/src/main/java/device/Device.java
index ca361d6..eadfffe 100644
--- a/src/main/java/device/Device.java
+++ b/src/main/java/device/Device.java
@@ -3,7 +3,7 @@ package device;
 public interface Device {
 
 	void louder();
-	void quiter();
+	void quieter();
 	int getVolume();
 	void next();
 	void prev();
diff --git a/src/main/java/device/RadioPlayer.java b/src/main/java/device/RadioPlayer.java
index 07d220b..603453b 100644
--- a/src/main/java/device/RadioPlayer.java
+++ b/src/main/java/device/RadioPlayer.java
@@ -7,7 +7,7 @@ public class RadioPlayer implements Device {
     }
 
     @Override
-    public void quiter() {
+    public void quieter() {
 
     }
 
diff --git a/src/main/java/device/UsbPlayer.java b/src/main/java/device/UsbPlayer.java
index 6eb3470..4c01207 100644
--- a/src/main/java/device/UsbPlayer.java
+++ b/src/main/java/device/UsbPlayer.java
@@ -8,7 +8,7 @@ public class UsbPlayer implements Device{
     }
 
     @Override
-    public void quiter() {
+    public void quieter() {
 
     }
 
diff --git a/src/test/java/device/CDPlayerTest.java b/src/test/java/device/CDPlayerTest.java
new file mode 100644
index 0000000..bddf879
--- /dev/null
+++ b/src/test/java/device/CDPlayerTest.java
@@ -0,0 +1,44 @@
+package device;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+class CDPlayerTest {
+
+    @Test
+    void louder() {
+    }
+
+    @Test
+    void quieter() {
+    }
+
+    @Test
+    void getVolume() {
+    }
+
+    @Test
+    void next() {
+    }
+
+    @Test
+    void prev() {
+    }
+
+    @Test
+    void getInfoText() {
+    }
+
+    @Test
+    void getOptions() {
+    }
+
+    @Test
+    void chooseOption() {
+    }
+
+    @Test
+    void play() {
+    }
+}
\ No newline at end of file