diff --git a/boulder-dash/test/fr/enssat/BoulderDash/models/LevelModelTest.java b/boulder-dash/test/fr/enssat/BoulderDash/models/LevelModelTest.java
index fe9ed99a..ae475ae1 100644
--- a/boulder-dash/test/fr/enssat/BoulderDash/models/LevelModelTest.java
+++ b/boulder-dash/test/fr/enssat/BoulderDash/models/LevelModelTest.java
@@ -67,6 +67,14 @@ public class LevelModelTest {
         assertEquals(2, levelModel.getRockfordPositionX());
         assertEquals(2,levelModel.getRockfordPositionY());
 
+        // The sounds are played in a different thread after an action occurred.
+        // This might happen after we verify the number of method calls.
+        // To avoid this, we sleep one second.
+        try {
+            Thread.sleep(1000);
+        } catch (InterruptedException e) {
+            throw new RuntimeException(e);
+        }
         // No sound is played
         verify(audioLoadHelper, never()).playSound(anyString());
     }
@@ -113,7 +121,15 @@ public class LevelModelTest {
         // The starting field of Rockford becomes an empty field
         assertInstanceOf(EmptyModel.class, groundLevelModel[1][1]);
 
-        //The sound for collecting a diamond is played.
+        // The sounds are played in a different thread after an action occurred.
+        // This might happen after we verify the number of method calls (which would make this test fail).
+        // To avoid this, we sleep one second.
+        try {
+            Thread.sleep(1000);
+        } catch (InterruptedException e) {
+            throw new RuntimeException(e);
+        }
+        // The sound for collecting a diamond is played.
         verify(audioLoadHelper).playSound("coin");
     }
 
@@ -172,7 +188,15 @@ public class LevelModelTest {
         //   `this.groundGrid[oldX][oldY] = new EmptyModel();`
         assertInstanceOf(EmptyModel.class, groundLevelModel[1][1]);
 
-        // play sound
+        // The sounds are played in a different thread after an action occurred.
+        // This might happen after we verify the number of method calls (which would make this test fail).
+        // To avoid this, we sleep one second.
+        try {
+            Thread.sleep(1000);
+        } catch (InterruptedException e) {
+            throw new RuntimeException(e);
+        }
+        // The sound for collecting a diamond is played.
         verify(audioLoadHelper).playSound("coin");
     }
 }