Fixed failing unit tests.

Signed-off-by: Juergen Fickel <juergen.fickel@bosch.io>

Author: Juergen Fickel

java/src/test/java/org/eclipse/ditto/client/changes/internal/ImmutableAcknowledgementRequestHandleTest.java

@@ -21,14 +21,15 @@
 import org.eclipse.ditto.model.base.acks.AcknowledgementLabel;
 import org.eclipse.ditto.model.base.entity.id.EntityIdWithType;
 import org.eclipse.ditto.model.base.headers.DittoHeaders;
+import org.eclipse.ditto.model.things.ThingId;
 import org.junit.Test;
 
 import nl.jqno.equalsverifier.EqualsVerifier;
 
 /**
  * Unit tests for {@link ImmutableAcknowledgementRequestHandle}.
  */
-public class ImmutableAcknowledgementRequestHandleTest {
+public final class ImmutableAcknowledgementRequestHandleTest {
 
     @Test
     public void assertImmutability() {
@@ -39,8 +40,14 @@ public void assertImmutability() {
 
     @Test
     public void testHashCodeAndEquals() {
+        final ThingId red = ThingId.generateRandom();
+        final ThingId black = ThingId.generateRandom();
+
         EqualsVerifier.forClass(ImmutableAcknowledgementRequestHandle.class)
+                .usingGetClass()
                 .withIgnoredFields("acknowledgementPublisher")
+                .withPrefabValues(EntityIdWithType.class, red, black)
                 .verify();
     }
+
 }

java/src/test/java/org/eclipse/ditto/client/changes/internal/ImmutableChangeTest.java

@@ -23,6 +23,7 @@
 import org.eclipse.ditto.json.JsonValue;
 import org.eclipse.ditto.model.base.entity.id.EntityIdWithType;
 import org.eclipse.ditto.model.base.headers.DittoHeaders;
+import org.eclipse.ditto.model.things.ThingId;
 import org.junit.Test;
 
 import nl.jqno.equalsverifier.EqualsVerifier;
@@ -41,8 +42,13 @@ public void assertImmutability() {
 
     @Test
     public void testHashCodeAndEquals() {
+        final ThingId red = ThingId.generateRandom();
+        final ThingId black = ThingId.generateRandom();
+
         EqualsVerifier.forClass(ImmutableChange.class)
+                .usingGetClass()
                 .withIgnoredFields("acknowledgementPublisher")
+                .withPrefabValues(EntityIdWithType.class, red, black)
                 .verify();
     }