diff --git a/Lab00App-build/Lab00App-code/src/main/java/ch/heigvd/res/lab00/Alphorn.java b/Lab00App-build/Lab00App-code/src/main/java/ch/heigvd/res/lab00/Alphorn.java
new file mode 100644
index 0000000..f197f7f
--- /dev/null
+++ b/Lab00App-build/Lab00App-code/src/main/java/ch/heigvd/res/lab00/Alphorn.java
@@ -0,0 +1,29 @@
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package ch.heigvd.res.lab00;
+
+/**
+ *this class represent the new instrument
+ * @author zacharie
+ */
+public class Alphorn implements IInstrument{
+    
+public Alphorn(){}
+
+    @Override
+    public String play(){
+        return "bum-bum";
+    }
+    @Override
+     public int getSoundVolume(){
+        return 9;
+    }
+    @Override
+    public String getColor(){
+        return "green";
+    }
+      
+}
diff --git a/Lab00App-build/Lab00App-code/src/main/java/ch/heigvd/res/lab00/Flute.java b/Lab00App-build/Lab00App-code/src/main/java/ch/heigvd/res/lab00/Flute.java
index ea38934..5ec1cfd 100644
--- a/Lab00App-build/Lab00App-code/src/main/java/ch/heigvd/res/lab00/Flute.java
+++ b/Lab00App-build/Lab00App-code/src/main/java/ch/heigvd/res/lab00/Flute.java
@@ -18,4 +18,5 @@ public String getColor() {
     public int getSoundVolume() {
         return 3;
     }
+
 }
diff --git a/Lab00App-build/Lab00App-code/src/main/java/ch/heigvd/res/lab00/IInstrument.java b/Lab00App-build/Lab00App-code/src/main/java/ch/heigvd/res/lab00/IInstrument.java
index ee13a1b..eafeb01 100644
--- a/Lab00App-build/Lab00App-code/src/main/java/ch/heigvd/res/lab00/IInstrument.java
+++ b/Lab00App-build/Lab00App-code/src/main/java/ch/heigvd/res/lab00/IInstrument.java
@@ -1,5 +1,7 @@
+
 package ch.heigvd.res.lab00;
 
+
 /**
  * Created by Olivier Liechti on 28/02/18.
  */
@@ -7,4 +9,5 @@ public interface IInstrument {
     public String play();
     public String getColor();
     public int getSoundVolume();
+
 }
diff --git a/Lab00App-build/Lab00App-code/src/main/java/ch/heigvd/res/lab00/Trumpet.java b/Lab00App-build/Lab00App-code/src/main/java/ch/heigvd/res/lab00/Trumpet.java
index 25819dc..5ed92d0 100644
--- a/Lab00App-build/Lab00App-code/src/main/java/ch/heigvd/res/lab00/Trumpet.java
+++ b/Lab00App-build/Lab00App-code/src/main/java/ch/heigvd/res/lab00/Trumpet.java
@@ -1,5 +1,5 @@
-package ch.heigvd.res.lab00;
 
+package ch.heigvd.res.lab00;
 
 /**
  * Created by Olivier Liechti on 28/02/18.
@@ -17,6 +17,7 @@ public String getColor() {
 
     @Override
     public int getSoundVolume() {
-        return 8;
+        return 12 ;
     }
+
 }
diff --git a/Lab00App-build/Lab00App-tests/src/test/java/ch/heigvd/res/lab00/AlphornTest.java b/Lab00App-build/Lab00App-tests/src/test/java/ch/heigvd/res/lab00/AlphornTest.java
new file mode 100644
index 0000000..0926b50
--- /dev/null
+++ b/Lab00App-build/Lab00App-tests/src/test/java/ch/heigvd/res/lab00/AlphornTest.java
@@ -0,0 +1,54 @@
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package ch.heigvd.res.lab00;
+
+import org.junit.Assert;
+import static org.junit.Assert.assertNotNull;
+import org.junit.Test;
+
+/**
+ *this class should test the Alphorn instrument
+ * @author zacharie
+ */
+public class AlphornTest {
+  @Test
+  public void thereShouldBeAnIInstrumentInterfaceAndAAlphornClass() {
+    IInstrument alphorn = new Alphorn();
+    assertNotNull(alphorn);
+  }
+  
+  @Test
+  public void itShouldBePossibleToPlayAnInstrument() {
+    IInstrument alphorn = new Alphorn();
+    String sound = alphorn.play();
+    assertNotNull(sound);
+  }
+  
+  @Test
+  public void anAlphornShouldMakebumbum() {
+    IInstrument alphorn = new Alphorn();
+    String sound = alphorn.play();
+    Assert.assertEquals("bum-bum", sound);
+  }
+ 
+  @Test
+  public void anAlphornShouldNotBeLouderThanATrumpet() {
+    IInstrument alphorn = new Alphorn();
+    IInstrument trumpet = new Trumpet();
+    int alphornVolume = alphorn.getSoundVolume();
+    int trumpetVolume = trumpet.getSoundVolume();
+    Assert.assertTrue(alphornVolume < trumpetVolume);
+  }
+
+  @Test
+  public void anAlphornShouldBeGreen() {
+    IInstrument alphorn = new Alphorn();
+    String color = alphorn.getColor();
+    Assert.assertEquals("green", color);
+  }
+  
+  
+}
diff --git a/Lab00App-build/Lab00App-tests/src/test/java/ch/heigvd/res/lab00/TrumpetTest.java b/Lab00App-build/Lab00App-tests/src/test/java/ch/heigvd/res/lab00/TrumpetTest.java
index 1e408a9..9e081a9 100644
--- a/Lab00App-build/Lab00App-tests/src/test/java/ch/heigvd/res/lab00/TrumpetTest.java
+++ b/Lab00App-build/Lab00App-tests/src/test/java/ch/heigvd/res/lab00/TrumpetTest.java
@@ -34,7 +34,7 @@ public void aTrumpetShouldMakePouet() {
     String sound = trumpet.play();
     Assert.assertEquals("pouet", sound);
   }
-  
+ 
   @Test
   public void aTrumpetShouldBeLouderThanAFlute() {
     IInstrument trumpet = new Trumpet();
@@ -50,5 +50,5 @@ public void aTrumpetShouldBeGolden() {
     String color = trumpet.getColor();
     Assert.assertEquals("golden", color);
   }
- 
+
 }
diff --git a/Lab00App-build/Lab00App-tests/test-results.json b/Lab00App-build/Lab00App-tests/test-results.json
new file mode 100644
index 0000000..2780dbb
--- /dev/null
+++ b/Lab00App-build/Lab00App-tests/test-results.json
@@ -0,0 +1 @@
+{"ignoreCount":0,"failures":[],"runTime":109,"failureCount":0,"runCount":19}
\ No newline at end of file