diff --git a/co-simulation/fed/mosaic-infrastructure/src/test/java/org/eclipse/mosaic/fed/infrastructure/ambassador/InfrastructureInstanceManagerTest.java b/co-simulation/fed/mosaic-infrastructure/src/test/java/org/eclipse/mosaic/fed/infrastructure/ambassador/InfrastructureInstanceManagerTest.java
index 91d805c5..e213a36c 100644
--- a/co-simulation/fed/mosaic-infrastructure/src/test/java/org/eclipse/mosaic/fed/infrastructure/ambassador/InfrastructureInstanceManagerTest.java
+++ b/co-simulation/fed/mosaic-infrastructure/src/test/java/org/eclipse/mosaic/fed/infrastructure/ambassador/InfrastructureInstanceManagerTest.java
@@ -133,7 +133,7 @@ public void testOnDetectedObject() throws IOException{
                 new Vector3d(2, 3, 4),
                 new Vector3d(-4.4,-5.5,-6.6),
                 new Size(3, 4, 5));
-        Double[] covarianceMatrix = new Double[] { 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0 };
+        Double[][] covarianceMatrix =  { {0.0, 0.0, 0.0} , {0.0, 0.0, 0.0} , {0.0, 0.0, 0.0}};
         detectedObject1.setPositionCovariance(covarianceMatrix);
         detectedObject1.setVelocityCovariance(covarianceMatrix);
         detectedObject1.setAngularVelocityCovariance(covarianceMatrix);
diff --git a/co-simulation/fed/mosaic-infrastructure/src/test/java/org/eclipse/mosaic/fed/infrastructure/ambassador/InfrastructureInstanceTest.java b/co-simulation/fed/mosaic-infrastructure/src/test/java/org/eclipse/mosaic/fed/infrastructure/ambassador/InfrastructureInstanceTest.java
index 7a99a95e..5ea4c8d5 100644
--- a/co-simulation/fed/mosaic-infrastructure/src/test/java/org/eclipse/mosaic/fed/infrastructure/ambassador/InfrastructureInstanceTest.java
+++ b/co-simulation/fed/mosaic-infrastructure/src/test/java/org/eclipse/mosaic/fed/infrastructure/ambassador/InfrastructureInstanceTest.java
@@ -187,7 +187,7 @@ public void testSendInteraction() throws IOException {
                 new Vector3d(0, 0, 0),
                 new Vector3d(),
                 new Size(0, 0, 0));
-        Double[] covarianceMatrix = new Double[] { 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0 };
+        Double[][] covarianceMatrix =  { {0.0, 0.0, 0.0} , {0.0, 0.0, 0.0} , {0.0, 0.0, 0.0}};
         test_msg.setPositionCovariance(covarianceMatrix);
         test_msg.setVelocityCovariance(covarianceMatrix);
         test_msg.setAngularVelocityCovariance(covarianceMatrix);
diff --git a/co-simulation/fed/mosaic-infrastructure/src/test/java/org/eclipse/mosaic/fed/infrastructure/ambassador/InfrastructureMessageAmbassadorTest.java b/co-simulation/fed/mosaic-infrastructure/src/test/java/org/eclipse/mosaic/fed/infrastructure/ambassador/InfrastructureMessageAmbassadorTest.java
index a0103dcf..9fbc4e7c 100644
--- a/co-simulation/fed/mosaic-infrastructure/src/test/java/org/eclipse/mosaic/fed/infrastructure/ambassador/InfrastructureMessageAmbassadorTest.java
+++ b/co-simulation/fed/mosaic-infrastructure/src/test/java/org/eclipse/mosaic/fed/infrastructure/ambassador/InfrastructureMessageAmbassadorTest.java
@@ -196,7 +196,7 @@ public void testProcessInteraction() throws InternalFederateException{
                 new Vector3d(2, 3, 4),
                 new Vector3d(-4.4,-5.5,-6.6),
                 new Size(3, 4, 5));
-        Double[] covarianceMatrix = new Double[] { 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0 };
+        Double[][] covarianceMatrix =  { {0.0, 0.0, 0.0} , {0.0, 0.0, 0.0} , {0.0, 0.0, 0.0}};
         detectedObject.setPositionCovariance(covarianceMatrix);
         detectedObject.setVelocityCovariance(covarianceMatrix);
         detectedObject.setAngularVelocityCovariance(covarianceMatrix);
diff --git a/co-simulation/lib/mosaic-interactions/src/test/java/org/eclipse/mosaic/interactions/detector/DetectedObjectInteractionTest.java b/co-simulation/lib/mosaic-interactions/src/test/java/org/eclipse/mosaic/interactions/detector/DetectedObjectInteractionTest.java
index bb0772ef..8c7a0a8e 100644
--- a/co-simulation/lib/mosaic-interactions/src/test/java/org/eclipse/mosaic/interactions/detector/DetectedObjectInteractionTest.java
+++ b/co-simulation/lib/mosaic-interactions/src/test/java/org/eclipse/mosaic/interactions/detector/DetectedObjectInteractionTest.java
@@ -46,7 +46,7 @@ public void testGetterSetterConstructor() {
                 new Vector3d(1, 1, 1),
                 new Vector3d(.1, .2, .3),
                 new Size(2, 1, .5));
-        Double[] covarianceMatrix = new Double[] { 1.0, 0.0, 0.0, 0.0, 1.0, 0.0, 0.0, 0.0, 1.0 };
+        Double[][] covarianceMatrix =  { {0.0, 0.0, 0.0} , {0.0, 0.0, 0.0} , {0.0, 0.0, 0.0}};
         detectedObject.setPositionCovariance(covarianceMatrix);
         detectedObject.setVelocityCovariance(covarianceMatrix);
         detectedObject.setAngularVelocityCovariance(covarianceMatrix);
diff --git a/co-simulation/lib/mosaic-objects/src/test/java/org/eclipse/mosaic/lib/objects/detector/DetectedObjectTest.java b/co-simulation/lib/mosaic-objects/src/test/java/org/eclipse/mosaic/lib/objects/detector/DetectedObjectTest.java
index 7cb2117f..7368a5e3 100644
--- a/co-simulation/lib/mosaic-objects/src/test/java/org/eclipse/mosaic/lib/objects/detector/DetectedObjectTest.java
+++ b/co-simulation/lib/mosaic-objects/src/test/java/org/eclipse/mosaic/lib/objects/detector/DetectedObjectTest.java
@@ -87,7 +87,7 @@ public void testDetectObjectJsonSerialization() {
                 + "}";
         assertEquals(json,
                 json_prediction);
-
+        System.out.println(json);
     }
 
     @Test