TSK-1168: made interfaces clonable with a new "copy()" method, added tests

lib/taskana-core/src/main/java/pro/taskana/classification/api/models/Classification.java

@@ -36,6 +36,27 @@ public interface Classification extends ClassificationSummary {
    */
   String getDomain();
 
+  /**
+   * Get the logical name of the associated application entry point.
+   *
+   * @return applicationEntryPoint
+   */
+  String getApplicationEntryPoint();
+
+  /**
+   * Set the logical name of the associated application entry point.
+   *
+   * @param applicationEntryPoint The application entry point
+   */
+  void setApplicationEntryPoint(String applicationEntryPoint);
+
+  /**
+   * Duplicates this Classification.
+   *
+   * @return a copy of this Classification
+   */
+  Classification copy();
+
   /**
    * Get a flag if the classification if currently valid in the used domain.
    *
@@ -101,20 +122,6 @@ public interface Classification extends ClassificationSummary {
    */
   void setServiceLevel(String serviceLevel);
 
-  /**
-   * Get the logical name of the associated application entry point.
-   *
-   * @return applicationEntryPoint
-   */
-  String getApplicationEntryPoint();
-
-  /**
-   * Set the logical name of the associated application entry point.
-   *
-   * @param applicationEntryPoint The application entry point
-   */
-  void setApplicationEntryPoint(String applicationEntryPoint);
-
   /**
    * Set/Change the 1. custom-attribute.
    *
@@ -177,11 +184,4 @@ public interface Classification extends ClassificationSummary {
    * @return the ClassificationSummary object for the current classification
    */
   ClassificationSummary asSummary();
-
-  /**
-   * Duplicates this Classification
-   *
-   * @return a copy of this Classification
-   */
-  Classification clone();
 }

lib/taskana-core/src/main/java/pro/taskana/classification/api/models/ClassificationSummary.java

@@ -4,7 +4,7 @@ package pro.taskana.classification.api.models;
  * Interface for ClassificationSummaries. This is a specific short model-object which only requieres
  * the most important informations. Specific ones can be load afterwards via ID.
  */
-public interface ClassificationSummary extends Cloneable {
+public interface ClassificationSummary {
 
   /**
    * Gets the id of the classification.
@@ -141,9 +141,9 @@ public interface ClassificationSummary extends Cloneable {
   String getCustom8();
 
   /**
-   * Duplicates this ClassificationSummary
+   * Duplicates this ClassificationSummary.
    *
    * @return a copy of this ClassificationSummary
    */
-  ClassificationSummary clone();
+  ClassificationSummary copy();
 }

lib/taskana-core/src/main/java/pro/taskana/classification/internal/ClassificationServiceImpl.java

@@ -335,7 +335,7 @@ public class ClassificationServiceImpl implements ClassificationService {
   private void addClassificationToMasterDomain(ClassificationImpl classificationImpl) {
     if (!Objects.equals(classificationImpl.getDomain(), "")) {
       boolean doesExist = true;
-      ClassificationImpl masterClassification = new ClassificationImpl(classificationImpl);
+      ClassificationImpl masterClassification = classificationImpl.copy();
       masterClassification.setId(IdGenerator.generateWithPrefix(ID_PREFIX_CLASSIFICATION));
       masterClassification.setParentKey(classificationImpl.getParentKey());
       masterClassification.setDomain("");

lib/taskana-core/src/main/java/pro/taskana/classification/internal/models/ClassificationImpl.java

@@ -62,16 +62,6 @@ public class ClassificationImpl extends ClassificationSummaryImpl implements Cla
     this.description = description;
   }
 
-  @Override
-  public String getApplicationEntryPoint() {
-    return applicationEntryPoint;
-  }
-
-  @Override
-  public void setApplicationEntryPoint(String applicationEntryPoint) {
-    this.applicationEntryPoint = applicationEntryPoint;
-  }
-
   @Override
   public ClassificationSummary asSummary() {
     ClassificationSummaryImpl summary = new ClassificationSummaryImpl();
@@ -97,15 +87,25 @@ public class ClassificationImpl extends ClassificationSummaryImpl implements Cla
     return summary;
   }
 
-  protected boolean canEqual(Object other) {
-    return (other instanceof ClassificationImpl);
+  @Override
+  public String getApplicationEntryPoint() {
+    return applicationEntryPoint;
   }
 
   @Override
-  public ClassificationImpl clone() {
+  public void setApplicationEntryPoint(String applicationEntryPoint) {
+    this.applicationEntryPoint = applicationEntryPoint;
+  }
+
+  @Override
+  public ClassificationImpl copy() {
     return new ClassificationImpl(this);
   }
 
+  protected boolean canEqual(Object other) {
+    return (other instanceof ClassificationImpl);
+  }
+
   @Override
   public int hashCode() {
     return Objects.hash(super.hashCode(), isValidInDomain, created, modified, description);

lib/taskana-core/src/main/java/pro/taskana/classification/internal/models/ClassificationSummaryImpl.java

@@ -222,13 +222,13 @@ public class ClassificationSummaryImpl implements ClassificationSummary {
     this.custom8 = custom8;
   }
 
-  protected boolean canEqual(Object other) {
-    return (other instanceof ClassificationSummaryImpl);
+  @Override
+  public ClassificationSummaryImpl copy() {
+    return new ClassificationSummaryImpl(this);
   }
 
-  @Override
-  public ClassificationSummaryImpl clone() {
-    return new ClassificationSummaryImpl(this);
+  protected boolean canEqual(Object other) {
+    return (other instanceof ClassificationSummaryImpl);
   }
 
   @Override

lib/taskana-core/src/main/java/pro/taskana/task/api/models/Attachment.java

@@ -59,9 +59,9 @@ public interface Attachment extends AttachmentSummary {
   AttachmentSummary asSummary();
 
   /**
-   * Duplicates this Attachment
+   * Duplicates this Attachment.
    *
    * @return a copy of this Attachment
    */
-  Attachment clone();
+  Attachment copy();
 }

lib/taskana-core/src/main/java/pro/taskana/task/api/models/AttachmentSummary.java

@@ -8,7 +8,7 @@ import pro.taskana.classification.api.models.ClassificationSummary;
  * Interface for AttachmentSummaries. This is a specific short model-object which only contains the
  * most important information.
  */
-public interface AttachmentSummary extends Cloneable {
+public interface AttachmentSummary {
 
   /**
    * Gets the id of the attachment.
@@ -67,9 +67,9 @@ public interface AttachmentSummary extends Cloneable {
   Instant getReceived();
 
   /**
-   * Duplicates this AttachmentSummary
+   * Duplicates this AttachmentSummary.
    *
    * @return a copy of this AttachmentSummary
    */
-  AttachmentSummary clone();
+  AttachmentSummary copy();
 }

lib/taskana-core/src/main/java/pro/taskana/task/api/models/ObjectReference.java

@@ -7,7 +7,7 @@ import org.slf4j.LoggerFactory;
 import pro.taskana.common.api.exceptions.InvalidArgumentException;
 
 /** ObjectReference entity. */
-public class ObjectReference implements Cloneable {
+public class ObjectReference {
   private static final Logger LOGGER = LoggerFactory.getLogger(ObjectReference.class);
   private String id;
   private String company;
@@ -102,8 +102,7 @@ public class ObjectReference implements Cloneable {
     this.value = value;
   }
 
-  @Override
-  protected ObjectReference clone() {
+  protected ObjectReference copy() {
     return new ObjectReference(this);
   }
 

lib/taskana-core/src/main/java/pro/taskana/task/api/models/Task.java

@@ -189,9 +189,9 @@ public interface Task extends TaskSummary {
   String getClassificationCategory();
 
   /**
-   * Duplicates this Task
+   * Duplicates this Task.
    *
    * @return a copy of this Task
    */
-  Task clone();
+  Task copy();
 }

lib/taskana-core/src/main/java/pro/taskana/task/api/models/TaskComment.java

@@ -3,7 +3,7 @@ package pro.taskana.task.api.models;
 import java.time.Instant;
 
 /** TaskComment-Interface to specify TaskComment Attributes. */
-public interface TaskComment extends Cloneable {
+public interface TaskComment {
 
   /**
    * Gets the id of the task comment.
@@ -33,8 +33,11 @@ public interface TaskComment extends Cloneable {
    */
   String getTextField();
 
-  /** Sets the text field of the task comment. */
+  /**
+   * Sets the text field of the task comment.
+   *
    * @param textField the text field
+   */
   void setTextField(String textField);
 
   /**
@@ -52,9 +55,9 @@ public interface TaskComment extends Cloneable {
   Instant getModified();
 
   /**
-   * Duplicates this TaskComment
+   * Duplicates this TaskComment.
    *
    * @return a copy of this TaskComment
    */
-  TaskComment clone();
+  TaskComment copy();
 }

lib/taskana-core/src/main/java/pro/taskana/task/api/models/TaskSummary.java

@@ -12,7 +12,7 @@ import pro.taskana.workbasket.api.models.WorkbasketSummary;
  * Interface for TaskSummary. This is a specific short model-object which only contains the most
  * important information.
  */
-public interface TaskSummary extends Cloneable {
+public interface TaskSummary {
 
   /**
    * Gets the id of the task.
@@ -194,9 +194,9 @@ public interface TaskSummary extends Cloneable {
   String getCustomAttribute(String num) throws InvalidArgumentException;
 
   /**
-   * Duplicates this TaskSummary
+   * Duplicates this TaskSummary.
    *
    * @return a copy of this TaskSummary
    */
-  TaskSummary clone();
+  TaskSummary copy();
 }

lib/taskana-core/src/main/java/pro/taskana/task/internal/models/AttachmentImpl.java

@@ -50,13 +50,13 @@ public class AttachmentImpl extends AttachmentSummaryImpl implements Attachment
     return summary;
   }
 
-  protected boolean canEqual(Object other) {
-    return (!(other instanceof AttachmentImpl));
+  @Override
+  public AttachmentImpl copy() {
+    return new AttachmentImpl(this);
   }
 
-  @Override
-  public AttachmentImpl clone() {
-    return new AttachmentImpl(this);
+  protected boolean canEqual(Object other) {
+    return (!(other instanceof AttachmentImpl));
   }
 
   @Override

lib/taskana-core/src/main/java/pro/taskana/task/internal/models/AttachmentSummaryImpl.java

@@ -137,6 +137,11 @@ public class AttachmentSummaryImpl implements AttachmentSummary {
     this.received = received;
   }
 
+  @Override
+  public AttachmentSummaryImpl copy() {
+    return new AttachmentSummaryImpl(this);
+  }
+
   // auxiliary method to enable MyBatis access to classificationSummary
   @SuppressWarnings("unused")
   public ClassificationSummaryImpl getClassificationSummaryImpl() {
@@ -153,11 +158,6 @@ public class AttachmentSummaryImpl implements AttachmentSummary {
     return (!(other instanceof AttachmentSummaryImpl));
   }
 
-  @Override
-  public AttachmentSummaryImpl clone() {
-    return new AttachmentSummaryImpl(this);
-  }
-
   @Override
   public int hashCode() {
     return Objects.hash(

lib/taskana-core/src/main/java/pro/taskana/task/internal/models/TaskCommentImpl.java

@@ -16,7 +16,7 @@ public class TaskCommentImpl implements TaskComment {
 
   public TaskCommentImpl() {}
 
-  private TaskCommentImpl(TaskCommentImpl copyFrom) {
+  public TaskCommentImpl(TaskCommentImpl copyFrom) {
     id = copyFrom.id;
     taskId = copyFrom.taskId;
     textField = copyFrom.textField;
@@ -78,13 +78,13 @@ public class TaskCommentImpl implements TaskComment {
     this.modified = modified;
   }
 
-  protected boolean canEqual(Object other) {
-    return (other instanceof TaskCommentImpl);
+  @Override
+  public TaskCommentImpl copy() {
+    return new TaskCommentImpl(this);
   }
 
-  @Override
-  public TaskCommentImpl clone() {
-    return new TaskCommentImpl(this);
+  protected boolean canEqual(Object other) {
+    return (other instanceof TaskCommentImpl);
   }
 
   @Override

lib/taskana-core/src/main/java/pro/taskana/task/internal/models/TaskImpl.java

@@ -262,6 +262,11 @@ public class TaskImpl extends TaskSummaryImpl implements Task {
     ((ClassificationSummaryImpl) this.classificationSummary).setCategory(classificationCategory);
   }
 
+  @Override
+  public TaskImpl copy() {
+    return new TaskImpl(this);
+  }
+
   public String getClassificationId() {
     return classificationSummary == null ? null : classificationSummary.getId();
   }
@@ -270,11 +275,6 @@ public class TaskImpl extends TaskSummaryImpl implements Task {
     return (other instanceof TaskImpl);
   }
 
-  @Override
-  public TaskImpl clone() {
-    return new TaskImpl(this);
-  }
-
   @Override
   public int hashCode() {
     return Objects.hash(

lib/taskana-core/src/main/java/pro/taskana/task/internal/models/TaskSummaryImpl.java

@@ -472,6 +472,11 @@ public class TaskSummaryImpl implements TaskSummary {
     }
   }
 
+  @Override
+  public TaskSummaryImpl copy() {
+    return new TaskSummaryImpl(this);
+  }
+
   // utility method to allow mybatis access to workbasketSummary
   public WorkbasketSummaryImpl getWorkbasketSummaryImpl() {
     return (WorkbasketSummaryImpl) workbasketSummary;
@@ -647,11 +652,6 @@ public class TaskSummaryImpl implements TaskSummary {
     return (other instanceof TaskSummaryImpl);
   }
 
-  @Override
-  public TaskSummaryImpl clone() {
-    return new TaskSummaryImpl(this);
-  }
-
   @Override
   public int hashCode() {
     return Objects.hash(

lib/taskana-core/src/main/java/pro/taskana/workbasket/api/models/Workbasket.java

@@ -99,6 +99,13 @@ public interface Workbasket extends WorkbasketSummary {
    */
   void setMarkedForDeletion(boolean markedForDeletion);
 
+  /**
+   * Duplicates this Workbasket.
+   *
+   * @return a copy of this Workbasket
+   */
+  Workbasket copy();
+
   /**
    * Sets the owner-ID of the workbasket.
    *
@@ -126,11 +133,4 @@ public interface Workbasket extends WorkbasketSummary {
    * @return the WorkbasketSummary object for the current work basket
    */
   WorkbasketSummary asSummary();
-
-  /**
-   * Duplicates this Workbasket
-   *
-   * @return a copy of this Workbasket
-   */
-  Workbasket clone();
 }

lib/taskana-core/src/main/java/pro/taskana/workbasket/api/models/WorkbasketAccessItem.java

@@ -6,7 +6,7 @@ package pro.taskana.workbasket.api.models;
  *
  * @author bbr
  */
-public interface WorkbasketAccessItem extends Cloneable {
+public interface WorkbasketAccessItem {
 
   /**
    * Returns the current id of the WorkbasketAccessItem.
@@ -317,9 +317,9 @@ public interface WorkbasketAccessItem extends Cloneable {
   void setPermCustom12(boolean permCustom12);
 
   /**
-   * Duplicates this WorkbasketAccessItem
+   * Duplicates this WorkbasketAccessItem.
    *
    * @return a copy of this WorkbasketAccessItem
    */
-  WorkbasketAccessItem clone();
+  WorkbasketAccessItem copy();
 }

lib/taskana-core/src/main/java/pro/taskana/workbasket/api/models/WorkbasketSummary.java

@@ -6,7 +6,7 @@ import pro.taskana.workbasket.api.WorkbasketType;
  * Interface for WorkbasketSummary. This is a specific short model-object which only contains the
  * most important information.
  */
-public interface WorkbasketSummary extends Cloneable {
+public interface WorkbasketSummary {
 
   /**
    * Gets the id of the workbasket.
@@ -121,9 +121,9 @@ public interface WorkbasketSummary extends Cloneable {
   boolean isMarkedForDeletion();
 
   /**
-   * Duplicates this WorkbasketSummary
+   * Duplicates this WorkbasketSummary.
    *
    * @return a copy of this WorkbasketSummary
    */
-  WorkbasketSummary clone();
+  WorkbasketSummary copy();
 }

lib/taskana-core/src/main/java/pro/taskana/workbasket/internal/models/WorkbasketAccessItemImpl.java

@@ -430,7 +430,7 @@ public class WorkbasketAccessItemImpl implements WorkbasketAccessItem {
   }
 
   @Override
-  public WorkbasketAccessItemImpl clone() {
+  public WorkbasketAccessItemImpl copy() {
     return new WorkbasketAccessItemImpl(this);
   }
 

lib/taskana-core/src/main/java/pro/taskana/workbasket/internal/models/WorkbasketImpl.java

@@ -60,6 +60,11 @@ public class WorkbasketImpl extends WorkbasketSummaryImpl implements Workbasket
     return result;
   }
 
+  @Override
+  public WorkbasketImpl copy() {
+    return new WorkbasketImpl(this);
+  }
+
   protected boolean canEqual(Object other) {
     return (other instanceof WorkbasketImpl);
   }
@@ -105,11 +110,6 @@ public class WorkbasketImpl extends WorkbasketSummaryImpl implements Workbasket
     return Objects.equals(created, other.created) && Objects.equals(modified, other.modified);
   }
 
-  @Override
-  public WorkbasketImpl clone() {
-    return new WorkbasketImpl(this);
-  }
-
   @Override
   public String toString() {
     return "WorkbasketImpl [id="

lib/taskana-core/src/main/java/pro/taskana/workbasket/internal/models/WorkbasketSummaryImpl.java

@@ -250,6 +250,11 @@ public class WorkbasketSummaryImpl implements WorkbasketSummary {
     this.markedForDeletion = markedForDeletion;
   }
 
+  @Override
+  public WorkbasketSummaryImpl copy() {
+    return new WorkbasketSummaryImpl(this);
+  }
+
   protected boolean canEqual(Object other) {
     return (other instanceof WorkbasketSummaryImpl);
   }
@@ -305,11 +310,6 @@ public class WorkbasketSummaryImpl implements WorkbasketSummary {
         && Objects.equals(orgLevel4, other.orgLevel4);
   }
 
-  @Override
-  public WorkbasketSummaryImpl clone() {
-    return new WorkbasketSummaryImpl(this);
-  }
-
   @Override
   public String toString() {
     return "WorkbasketSummaryImpl [id="

lib/taskana-core/src/test/java/pro/taskana/classification/api/models/ClassificationModelsCloneTest.java

@@ -0,0 +1,62 @@
+package pro.taskana.classification.api.models;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import org.junit.jupiter.api.Test;
+
+import pro.taskana.classification.internal.models.ClassificationImpl;
+
+class ClassificationModelsCloneTest {
+
+  @Test
+  void testCloneInClassificationSummary() {
+    Classification dummyClassificationForSummaryTest = new ClassificationImpl();
+    dummyClassificationForSummaryTest.setApplicationEntryPoint("dummyEntryPoint");
+    dummyClassificationForSummaryTest.setCategory("dummyCategory");
+    dummyClassificationForSummaryTest.setCustom1("dummyCustom1");
+    dummyClassificationForSummaryTest.setCustom2("dummyCustom2");
+    dummyClassificationForSummaryTest.setCustom3("dummyCustom3");
+    dummyClassificationForSummaryTest.setCustom4("dummyCustom4");
+    dummyClassificationForSummaryTest.setCustom5("dummyCustom5");
+    dummyClassificationForSummaryTest.setCustom6("dummyCustom6");
+    dummyClassificationForSummaryTest.setCustom7("dummyCustom7");
+    dummyClassificationForSummaryTest.setCustom8("dummyCustom8");
+    dummyClassificationForSummaryTest.setDescription("dummyDescription");
+    dummyClassificationForSummaryTest.setIsValidInDomain(true);
+    dummyClassificationForSummaryTest.setParentId("dummyParentId");
+    dummyClassificationForSummaryTest.setServiceLevel("dummyServiceLevel");
+    dummyClassificationForSummaryTest.setPriority(1);
+    dummyClassificationForSummaryTest.setName("dummyName");
+    dummyClassificationForSummaryTest.setParentKey("dummyParentKey");
+    ClassificationSummary dummyClassificationSummary =
+        dummyClassificationForSummaryTest.asSummary();
+    ClassificationSummary dummyClassificationSummaryCloned = dummyClassificationSummary.copy();
+    assertThat(dummyClassificationSummaryCloned).isEqualTo(dummyClassificationSummary);
+    assertThat(dummyClassificationSummaryCloned).isNotSameAs(dummyClassificationSummary);
+  }
+
+  @Test
+  void testCloneInClassification() {
+    Classification dummyClassification = new ClassificationImpl();
+    dummyClassification.setApplicationEntryPoint("dummyEntryPoint");
+    dummyClassification.setCategory("dummyCategory");
+    dummyClassification.setCustom1("dummyCustom1");
+    dummyClassification.setCustom2("dummyCustom2");
+    dummyClassification.setCustom3("dummyCustom3");
+    dummyClassification.setCustom4("dummyCustom4");
+    dummyClassification.setCustom5("dummyCustom5");
+    dummyClassification.setCustom6("dummyCustom6");
+    dummyClassification.setCustom7("dummyCustom7");
+    dummyClassification.setCustom8("dummyCustom8");
+    dummyClassification.setDescription("dummyDescription");
+    dummyClassification.setIsValidInDomain(true);
+    dummyClassification.setParentId("dummyParentId");
+    dummyClassification.setServiceLevel("dummyServiceLevel");
+    dummyClassification.setPriority(1);
+    dummyClassification.setName("dummyName");
+    dummyClassification.setParentKey("dummyParentKey");
+    Classification dummyClassificationCloned = dummyClassification.copy();
+    assertThat(dummyClassificationCloned).isEqualTo(dummyClassification);
+    assertThat(dummyClassificationCloned).isNotSameAs(dummyClassification);
+  }
+}

lib/taskana-core/src/test/java/pro/taskana/task/api/models/TaskModelsCloneTest.java

@@ -0,0 +1,112 @@
+package pro.taskana.task.api.models;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.Map;
+import org.junit.jupiter.api.Test;
+
+import pro.taskana.task.internal.CreateTaskModelHelper;
+import pro.taskana.task.internal.models.TaskCommentImpl;
+import pro.taskana.task.internal.models.TaskSummaryImpl;
+
+class TaskModelsCloneTest {
+
+  @Test
+  void testCloneInTaskSummary() {
+    TaskSummaryImpl dummyTaskSummary = new TaskSummaryImpl();
+
+    Attachment dummyAttachmentForSummaryTestPreClone =
+        CreateTaskModelHelper.createAttachment("uniqueIdForDeepTest", "uniqueTaskIdForDeepTest");
+    AttachmentSummary dummyAttachmentSummary = dummyAttachmentForSummaryTestPreClone.asSummary();
+    ArrayList<AttachmentSummary> attachmentSummaries = new ArrayList<>();
+    attachmentSummaries.add(dummyAttachmentSummary);
+    dummyTaskSummary.setAttachmentSummaries(attachmentSummaries);
+
+    TaskSummary dummyTaskSummaryCloned = dummyTaskSummary.copy();
+    assertThat(dummyTaskSummaryCloned).isEqualTo(dummyTaskSummary);
+    assertThat(dummyTaskSummaryCloned).isNotSameAs(dummyTaskSummary);
+
+    Attachment dummyAttachmentForSummaryTestPostClone =
+        CreateTaskModelHelper.createAttachment(
+            "differentIdForDeepTest", "differentTaskIdForDeepTest");
+    AttachmentSummary dummyAttachmentSummary2 = dummyAttachmentForSummaryTestPostClone.asSummary();
+    attachmentSummaries.add(dummyAttachmentSummary2);
+    assertThat(dummyTaskSummaryCloned).isNotEqualTo(dummyTaskSummary);
+  }
+
+  @Test
+  void testCloneInTask() {
+    Task dummyTask =
+        CreateTaskModelHelper.createUnitTestTask(
+            "dummyTaskId",
+            "dummyTaskName",
+            "workbasketKey",
+            CreateTaskModelHelper.createDummyClassification());
+    Map<String, String> dummyCustomAttributesPreClone = new HashMap<>();
+    dummyCustomAttributesPreClone.put("dummyAttributeKey", "dummyAttributeValue");
+    dummyTask.setCustomAttributes(dummyCustomAttributesPreClone);
+    Map<String, String> dummyCallbackInfoPreClone = new HashMap<>();
+    dummyCallbackInfoPreClone.put("dummyCallbackKey", "dummyCallbackValue");
+    dummyTask.setCallbackInfo(dummyCallbackInfoPreClone);
+
+    Task dummyTaskCloned = dummyTask.copy();
+    assertThat(dummyTaskCloned).isEqualTo(dummyTask);
+    assertThat(dummyTaskCloned).isNotSameAs(dummyTask);
+
+    dummyCustomAttributesPreClone.put("deepTestAttributeKey", "deepTestAttributeValue");
+    dummyCallbackInfoPreClone.put("deepTestCallbackKey", "deepTestCallbackValue");
+    assertThat(dummyTaskCloned).isNotEqualTo(dummyTask);
+  }
+
+  @Test
+  void testCloneInTaskComment() {
+    TaskCommentImpl dummyComment = new TaskCommentImpl();
+    dummyComment.setTextField("dummyTextField");
+    TaskComment dummyCommentCloned = dummyComment.copy();
+    assertThat(dummyCommentCloned).isEqualTo(dummyComment);
+    assertThat(dummyCommentCloned).isNotSameAs(dummyComment);
+  }
+
+  @Test
+  void testCloneInObjectReference() {
+    ObjectReference dummyReference = new ObjectReference();
+    dummyReference.setId("dummyId");
+    dummyReference.setSystem("dummySystem");
+    dummyReference.setCompany("dummyCompany");
+    dummyReference.setSystemInstance("dummySystemInstance");
+    dummyReference.setType("dummyType");
+    dummyReference.setValue("dummyValue");
+    ObjectReference dummyReferenceCloned = dummyReference.copy();
+    assertThat(dummyReferenceCloned).isEqualTo(dummyReference);
+    assertThat(dummyReferenceCloned).isNotSameAs(dummyReference);
+  }
+
+  @Test
+  void testCloneInAttachmentSummary() {
+    Attachment dummyAttachmentForSummaryTest =
+        CreateTaskModelHelper.createAttachment("dummyAttachmentId", "dummyTaskId");
+    AttachmentSummary dummyAttachmentSummary = dummyAttachmentForSummaryTest.asSummary();
+    AttachmentSummary dummyAttachmentSummaryCloned = dummyAttachmentSummary.copy();
+    assertThat(dummyAttachmentSummaryCloned).isEqualTo(dummyAttachmentSummary);
+    assertThat(dummyAttachmentSummaryCloned).isNotSameAs(dummyAttachmentSummary);
+  }
+
+  @Test
+  void testCloneInAttachment() {
+    Attachment dummyAttachment =
+        CreateTaskModelHelper.createAttachment("dummyAttachmentId", "dummyTaskId");
+
+    Map<String, String> dummyMapPreClone = new HashMap<>();
+    dummyMapPreClone.put("dummyString1", "dummyString2");
+    dummyAttachment.setCustomAttributes(dummyMapPreClone);
+
+    Attachment dummyAttachmentCloned = dummyAttachment.copy();
+    assertThat(dummyAttachmentCloned).isEqualTo(dummyAttachment);
+    assertThat(dummyAttachmentCloned).isNotSameAs(dummyAttachment);
+
+    dummyMapPreClone.put("deepTestString1", "deepTestString2");
+    assertThat(dummyAttachment).isNotEqualTo(dummyAttachmentCloned);
+  }
+}

lib/taskana-core/src/test/java/pro/taskana/task/internal/CreateTaskModelHelper.java

@@ -0,0 +1,61 @@
+package pro.taskana.task.internal;
+
+import java.time.Duration;
+import java.time.Instant;
+import java.util.ArrayList;
+
+import pro.taskana.classification.api.models.Classification;
+import pro.taskana.classification.internal.models.ClassificationImpl;
+import pro.taskana.task.api.models.Attachment;
+import pro.taskana.task.internal.models.AttachmentImpl;
+import pro.taskana.task.internal.models.TaskImpl;
+import pro.taskana.workbasket.internal.models.WorkbasketImpl;
+
+public class CreateTaskModelHelper {
+
+  public static TaskImpl createUnitTestTask(
+      String id, String name, String workbasketKey, Classification classification) {
+    TaskImpl task = new TaskImpl();
+    task.setId(id);
+    task.setExternalId(id);
+    task.setName(name);
+    task.setWorkbasketKey(workbasketKey);
+    task.setDomain("");
+    task.setAttachments(new ArrayList<>());
+    Instant now = Instant.now().minus(Duration.ofMinutes(1L));
+    task.setCreated(now);
+    task.setModified(now);
+    if (classification == null) {
+      classification = createDummyClassification();
+    }
+    task.setClassificationSummary(classification.asSummary());
+    task.setClassificationKey(classification.getKey());
+    task.setDomain(classification.getDomain());
+    return task;
+  }
+
+  public static Classification createDummyClassification() {
+    ClassificationImpl classification = new ClassificationImpl();
+    classification.setName("dummy-classification");
+    classification.setDomain("dummy-domain");
+    classification.setKey("dummy-classification-key");
+    classification.setId("DummyClassificationId");
+    return classification;
+  }
+
+  public static WorkbasketImpl createWorkbasket(String id, String key) {
+    WorkbasketImpl workbasket = new WorkbasketImpl();
+    workbasket.setId(id);
+    workbasket.setDomain("Domain1");
+    workbasket.setKey(key);
+    workbasket.setName("Workbasket " + id);
+    return workbasket;
+  }
+
+  public static Attachment createAttachment(String id, String taskId) {
+    AttachmentImpl attachment = new AttachmentImpl();
+    attachment.setId(id);
+    attachment.setTaskId(taskId);
+    return attachment;
+  }
+}

lib/taskana-core/src/test/java/pro/taskana/task/internal/TaskAttachmentTest.java

@@ -9,15 +9,11 @@ import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 import org.junit.jupiter.api.Test;
-import org.junit.jupiter.api.extension.ExtendWith;
-import org.mockito.InjectMocks;
-import org.mockito.junit.jupiter.MockitoExtension;
 
 import pro.taskana.classification.internal.models.ClassificationImpl;
 import pro.taskana.task.api.models.Attachment;
 import pro.taskana.task.api.models.AttachmentSummary;
 import pro.taskana.task.api.models.ObjectReference;
-import pro.taskana.task.internal.models.AttachmentImpl;
 import pro.taskana.task.internal.models.TaskImpl;
 
 /**
@@ -25,16 +21,15 @@ import pro.taskana.task.internal.models.TaskImpl;
  * This test should test every interaction with Attachments, which means adding, removing, nulling
  * them.
  */
-@ExtendWith(MockitoExtension.class)
 class TaskAttachmentTest {
 
-  @InjectMocks private TaskImpl cut;
+  private TaskImpl cut = new TaskImpl();
 
   @Test
   void testAddAttachmentWithValidValue() {
-    Attachment attachment1 = createAttachment("ID1", "taskId1");
-    Attachment attachment2 = createAttachment("ID2", "taskId1");
-    Attachment attachment3 = createAttachment("ID3", "taskId1");
+    Attachment attachment1 = CreateTaskModelHelper.createAttachment("ID1", "taskId1");
+    Attachment attachment2 = CreateTaskModelHelper.createAttachment("ID2", "taskId1");
+    Attachment attachment3 = CreateTaskModelHelper.createAttachment("ID3", "taskId1");
 
     cut.addAttachment(attachment1);
     cut.addAttachment(attachment2);
@@ -45,7 +40,7 @@ class TaskAttachmentTest {
 
   @Test
   void testAddNullValue() {
-    Attachment attachment1 = createAttachment("ID1", "taskId1");
+    Attachment attachment1 = CreateTaskModelHelper.createAttachment("ID1", "taskId1");
 
     cut.addAttachment(attachment1);
     cut.addAttachment(null);
@@ -56,8 +51,8 @@ class TaskAttachmentTest {
   @Test
   void testAddSameTwice() {
     // Same values, not same REF. Important.
-    Attachment attachment1 = createAttachment("ID1", "taskId1");
-    Attachment attachment2 = createAttachment("ID1", "taskId1");
+    Attachment attachment1 = CreateTaskModelHelper.createAttachment("ID1", "taskId1");
+    Attachment attachment2 = CreateTaskModelHelper.createAttachment("ID1", "taskId1");
 
     cut.addAttachment(attachment1);
     cut.addAttachment(attachment2);
@@ -75,8 +70,8 @@ class TaskAttachmentTest {
   @Test
   void testRemoveAttachment() {
     // Testing normal way
-    Attachment attachment1 = createAttachment("ID1", "taskId1");
-    Attachment attachment2 = createAttachment("ID2", "taskId1");
+    Attachment attachment1 = CreateTaskModelHelper.createAttachment("ID1", "taskId1");
+    Attachment attachment2 = CreateTaskModelHelper.createAttachment("ID2", "taskId1");
     cut.addAttachment(attachment1);
     cut.addAttachment(attachment2);
 
@@ -88,7 +83,7 @@ class TaskAttachmentTest {
 
   @Test
   void testRemoveLoopStopsAtResult() {
-    Attachment attachment1 = createAttachment("ID2", "taskId1");
+    Attachment attachment1 = CreateTaskModelHelper.createAttachment("ID2", "taskId1");
     // adding same uncommon way to test that the loop will stop.
     cut.getAttachments().add(attachment1);
     cut.getAttachments().add(attachment1);
@@ -110,7 +105,7 @@ class TaskAttachmentTest {
     Map<String, String> customAttr = new HashMap<>();
     customAttr.put("key", "value");
 
-    Attachment attachment1 = createAttachment("ID1", "taskId1");
+    Attachment attachment1 = CreateTaskModelHelper.createAttachment("ID1", "taskId1");
     attachment1.setChannel("channel");
     attachment1.setClassificationSummary(new ClassificationImpl().asSummary());
     attachment1.setReceived(Instant.now());
@@ -143,11 +138,4 @@ class TaskAttachmentTest {
     summaries = cut.asSummary().getAttachmentSummaries();
     assertThat(summaries.size(), equalTo(0));
   }
-
-  private Attachment createAttachment(String id, String taskId) {
-    AttachmentImpl attachment = new AttachmentImpl();
-    attachment.setId(id);
-    attachment.setTaskId(taskId);
-    return attachment;
-  }
 }

lib/taskana-core/src/test/java/pro/taskana/task/internal/TaskServiceImplTest.java

@@ -3,20 +3,15 @@ package pro.taskana.task.internal;
 import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.junit.jupiter.api.Assertions.assertNotEquals;
 
-import java.time.Duration;
-import java.time.Instant;
-import java.util.ArrayList;
 import org.junit.jupiter.api.Test;
 
 import pro.taskana.classification.api.models.Classification;
-import pro.taskana.classification.internal.models.ClassificationImpl;
 import pro.taskana.common.internal.JunitHelper;
 import pro.taskana.task.api.TaskState;
 import pro.taskana.task.api.models.ObjectReference;
 import pro.taskana.task.api.models.TaskSummary;
 import pro.taskana.task.internal.models.TaskImpl;
 import pro.taskana.workbasket.api.models.Workbasket;
-import pro.taskana.workbasket.internal.models.WorkbasketImpl;
 
 /**
  * Unit Test for TaskServiceImpl.
@@ -27,13 +22,15 @@ class TaskServiceImplTest {
 
   @Test
   void testTaskSummaryEqualsHashCode() throws InterruptedException {
-    Classification classification = createDummyClassification();
-    Workbasket wb = createWorkbasket("WB-ID", "WB-Key");
+    Classification classification = CreateTaskModelHelper.createDummyClassification();
+    Workbasket wb = CreateTaskModelHelper.createWorkbasket("WB-ID", "WB-Key");
     ObjectReference objectReference = JunitHelper.createDefaultObjRef();
-    TaskImpl taskBefore = createUnitTestTask("ID", "taskName", wb.getKey(), classification);
+    TaskImpl taskBefore =
+        CreateTaskModelHelper.createUnitTestTask("ID", "taskName", wb.getKey(), classification);
     taskBefore.setPrimaryObjRef(objectReference);
     Thread.sleep(10);
-    TaskImpl taskAfter = createUnitTestTask("ID", "taskName", wb.getKey(), classification);
+    TaskImpl taskAfter =
+        CreateTaskModelHelper.createUnitTestTask("ID", "taskName", wb.getKey(), classification);
     taskAfter.setPrimaryObjRef(objectReference);
     TaskSummary summaryBefore = taskBefore.asSummary();
     TaskSummary summaryAfter = taskAfter.asSummary();
@@ -57,7 +54,7 @@ class TaskServiceImplTest {
     assertEquals(summaryBefore, summaryAfter);
     assertEquals(summaryBefore.hashCode(), summaryAfter.hashCode());
   }
-
+  
   static TaskImpl createUnitTestTask(
       String id, String name, String workbasketKey, Classification classification) {
     TaskImpl task = new TaskImpl();
@@ -97,4 +94,5 @@ class TaskServiceImplTest {
     workbasket.setName("Workbasket " + id);
     return workbasket;
   }
+  
 }

lib/taskana-core/src/test/java/pro/taskana/task/internal/TaskTransferrerTest.java

@@ -74,12 +74,12 @@ class TaskTransferrerTest {
     cut = new TaskTransferrer(internalTaskanaEngineMock, taskMapperMock, taskServiceImplMock);
 
     final TaskTransferrer cutSpy = Mockito.spy(cut);
-    Workbasket destinationWorkbasket = TaskServiceImplTest.createWorkbasket("2", "k1");
-    Workbasket sourceWorkbasket = TaskServiceImplTest.createWorkbasket("47", "key47");
-    Classification dummyClassification = TaskServiceImplTest.createDummyClassification();
+    Workbasket destinationWorkbasket = CreateTaskModelHelper.createWorkbasket("2", "k1");
+    Workbasket sourceWorkbasket = CreateTaskModelHelper.createWorkbasket("47", "key47");
+    Classification dummyClassification = CreateTaskModelHelper.createDummyClassification();
     TaskImpl task =
-        TaskServiceImplTest.createUnitTestTask(
-            "1", "Unit Test Task 1", "key47", dummyClassification);
+        CreateTaskModelHelper
+            .createUnitTestTask("1", "Unit Test Task 1", "key47", dummyClassification);
     task.setWorkbasketSummary(sourceWorkbasket.asSummary());
     task.setRead(true);
     when(workbasketServiceMock.getWorkbasket(destinationWorkbasket.getId()))

lib/taskana-core/src/test/java/pro/taskana/workbasket/api/models/WorkbasketModelsCloneTest.java

@@ -0,0 +1,78 @@
+package pro.taskana.workbasket.api.models;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import org.junit.jupiter.api.Test;
+
+import pro.taskana.workbasket.internal.models.WorkbasketAccessItemImpl;
+import pro.taskana.workbasket.internal.models.WorkbasketImpl;
+
+class WorkbasketModelsCloneTest {
+
+  @Test
+  void testCloneInWorkbasketSummary() {
+    Workbasket dummyWorkbasketForSummaryTest = new WorkbasketImpl();
+    dummyWorkbasketForSummaryTest.setCustom1("dummyCustom1");
+    dummyWorkbasketForSummaryTest.setCustom2("dummyCustom2");
+    dummyWorkbasketForSummaryTest.setCustom3("dummyCustom3");
+    dummyWorkbasketForSummaryTest.setCustom4("dummyCustom4");
+    dummyWorkbasketForSummaryTest.setDescription("dummyDescription");
+    dummyWorkbasketForSummaryTest.setMarkedForDeletion(false);
+    dummyWorkbasketForSummaryTest.setName("dummyName");
+    dummyWorkbasketForSummaryTest.setOrgLevel1("dummyOrgLevel1");
+    dummyWorkbasketForSummaryTest.setOrgLevel2("dummyOrgLevel2");
+    dummyWorkbasketForSummaryTest.setOrgLevel3("dummyOrgLevel3");
+    dummyWorkbasketForSummaryTest.setOrgLevel4("dummyOrgLevel4");
+    dummyWorkbasketForSummaryTest.setOwner("dummyOwner");
+    WorkbasketSummary dummyWorkbasketSummary = dummyWorkbasketForSummaryTest.asSummary();
+    WorkbasketSummary dummyWorkbasketSummaryCloned = dummyWorkbasketSummary.copy();
+    assertThat(dummyWorkbasketSummaryCloned).isEqualTo(dummyWorkbasketSummary);
+    assertThat(dummyWorkbasketSummaryCloned).isNotSameAs(dummyWorkbasketSummary);
+  }
+
+  @Test
+  void testCloneInWorkbasket() {
+    Workbasket dummyWorkbasket = new WorkbasketImpl();
+    dummyWorkbasket.setCustom1("dummyCustom1");
+    dummyWorkbasket.setCustom2("dummyCustom2");
+    dummyWorkbasket.setCustom3("dummyCustom3");
+    dummyWorkbasket.setCustom4("dummyCustom4");
+    dummyWorkbasket.setDescription("dummyDescription");
+    dummyWorkbasket.setMarkedForDeletion(false);
+    dummyWorkbasket.setName("dummyName");
+    dummyWorkbasket.setOrgLevel1("dummyOrgLevel1");
+    dummyWorkbasket.setOrgLevel2("dummyOrgLevel2");
+    dummyWorkbasket.setOrgLevel3("dummyOrgLevel3");
+    dummyWorkbasket.setOrgLevel4("dummyOrgLevel4");
+    dummyWorkbasket.setOwner("dummyOwner");
+    Workbasket dummyWorkbasketCloned = dummyWorkbasket.copy();
+    assertThat(dummyWorkbasketCloned).isEqualTo(dummyWorkbasket);
+    assertThat(dummyWorkbasketCloned).isNotSameAs(dummyWorkbasket);
+  }
+
+  @Test
+  void testCloneInWorkbasketAccessItem() {
+    WorkbasketAccessItem dummyWorkbasketAccessItem = new WorkbasketAccessItemImpl();
+    dummyWorkbasketAccessItem.setAccessName("dummyAccessName");
+    dummyWorkbasketAccessItem.setPermAppend(false);
+    dummyWorkbasketAccessItem.setPermCustom1(false);
+    dummyWorkbasketAccessItem.setPermCustom2(false);
+    dummyWorkbasketAccessItem.setPermCustom3(false);
+    dummyWorkbasketAccessItem.setPermCustom4(false);
+    dummyWorkbasketAccessItem.setPermCustom5(false);
+    dummyWorkbasketAccessItem.setPermCustom6(false);
+    dummyWorkbasketAccessItem.setPermCustom7(false);
+    dummyWorkbasketAccessItem.setPermCustom8(false);
+    dummyWorkbasketAccessItem.setPermCustom9(false);
+    dummyWorkbasketAccessItem.setPermCustom10(false);
+    dummyWorkbasketAccessItem.setPermCustom11(false);
+    dummyWorkbasketAccessItem.setPermCustom12(false);
+    dummyWorkbasketAccessItem.setPermDistribute(false);
+    dummyWorkbasketAccessItem.setPermOpen(false);
+    dummyWorkbasketAccessItem.setPermRead(false);
+    dummyWorkbasketAccessItem.setPermTransfer(false);
+    WorkbasketAccessItem dummyWorkbasketAccessItemCloned = dummyWorkbasketAccessItem.copy();
+    assertThat(dummyWorkbasketAccessItemCloned).isEqualTo(dummyWorkbasketAccessItem);
+    assertThat(dummyWorkbasketAccessItemCloned).isNotSameAs(dummyWorkbasketAccessItem);
+  }
+}