diff --git a/backend/.idea/workspace.xml b/backend/.idea/workspace.xml
index 6ffd214..fc7a90a 100644
--- a/backend/.idea/workspace.xml
+++ b/backend/.idea/workspace.xml
@@ -4,8 +4,9 @@
     <option name="autoReloadType" value="SELECTIVE" />
   </component>
   <component name="ChangeListManager">
-    <list default="true" id="3a869f59-290a-4ab2-b036-a878ce801bc4" name="Changes" comment="Consider increased number of tasks">
-      <change beforePath="$PROJECT_DIR$/src/main/java/core/services/TaskService.java" beforeDir="false" afterPath="$PROJECT_DIR$/src/main/java/core/services/TaskService.java" afterDir="false" />
+    <list default="true" id="3a869f59-290a-4ab2-b036-a878ce801bc4" name="Changes" comment="Remove entityManager from TaskService">
+      <change beforePath="$PROJECT_DIR$/.idea/workspace.xml" beforeDir="false" afterPath="$PROJECT_DIR$/.idea/workspace.xml" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/src/test/java/core/tasks/TaskServiceTest.java" beforeDir="false" afterPath="$PROJECT_DIR$/src/test/java/core/tasks/TaskServiceTest.java" afterDir="false" />
     </list>
     <option name="SHOW_DIALOG" value="false" />
     <option name="HIGHLIGHT_CONFLICTS" value="true" />
@@ -84,22 +85,7 @@
       <recent name="$PROJECT_DIR$/src/test/java/core/taskgroups" />
     </key>
   </component>
-  <component name="RunManager" selected="JUnit.TaskServiceTest.deleteTask">
-    <configuration name="TaskRepositoryTest" type="JUnit" factoryName="JUnit" temporary="true" nameIsGenerated="true">
-      <module name="demo" />
-      <extension name="coverage">
-        <pattern>
-          <option name="PATTERN" value="core.tasks.*" />
-          <option name="ENABLED" value="true" />
-        </pattern>
-      </extension>
-      <option name="PACKAGE_NAME" value="core.tasks" />
-      <option name="MAIN_CLASS_NAME" value="core.tasks.TaskRepositoryTest" />
-      <option name="TEST_OBJECT" value="class" />
-      <method v="2">
-        <option name="Make" enabled="true" />
-      </method>
-    </configuration>
+  <component name="RunManager" selected="JUnit.TaskServiceTest">
     <configuration name="TaskServiceTest" type="JUnit" factoryName="JUnit" temporary="true" nameIsGenerated="true">
       <module name="demo" />
       <extension name="coverage">
@@ -115,7 +101,7 @@
         <option name="Make" enabled="true" />
       </method>
     </configuration>
-    <configuration name="TaskServiceTest.createTask" type="JUnit" factoryName="JUnit" temporary="true" nameIsGenerated="true">
+    <configuration name="TaskServiceTest.clearTasks" type="JUnit" factoryName="JUnit" temporary="true" nameIsGenerated="true">
       <module name="demo" />
       <extension name="coverage">
         <pattern>
@@ -125,7 +111,7 @@
       </extension>
       <option name="PACKAGE_NAME" value="core.tasks" />
       <option name="MAIN_CLASS_NAME" value="core.tasks.TaskServiceTest" />
-      <option name="METHOD_NAME" value="createTask" />
+      <option name="METHOD_NAME" value="clearTasks" />
       <option name="TEST_OBJECT" value="method" />
       <method v="2">
         <option name="Make" enabled="true" />
@@ -147,17 +133,34 @@
         <option name="Make" enabled="true" />
       </method>
     </configuration>
-    <configuration name="TaskgroupServiceTest" type="JUnit" factoryName="JUnit" temporary="true" nameIsGenerated="true">
+    <configuration name="TaskServiceTest.finishTask" type="JUnit" factoryName="JUnit" temporary="true" nameIsGenerated="true">
       <module name="demo" />
       <extension name="coverage">
         <pattern>
-          <option name="PATTERN" value="core.taskgroups.*" />
+          <option name="PATTERN" value="core.tasks.*" />
           <option name="ENABLED" value="true" />
         </pattern>
       </extension>
-      <option name="PACKAGE_NAME" value="core.taskgroups" />
-      <option name="MAIN_CLASS_NAME" value="core.taskgroups.TaskgroupServiceTest" />
-      <option name="TEST_OBJECT" value="class" />
+      <option name="PACKAGE_NAME" value="core.tasks" />
+      <option name="MAIN_CLASS_NAME" value="core.tasks.TaskServiceTest" />
+      <option name="METHOD_NAME" value="finishTask" />
+      <option name="TEST_OBJECT" value="method" />
+      <method v="2">
+        <option name="Make" enabled="true" />
+      </method>
+    </configuration>
+    <configuration name="TaskServiceTest.loadAllTasks" type="JUnit" factoryName="JUnit" temporary="true" nameIsGenerated="true">
+      <module name="demo" />
+      <extension name="coverage">
+        <pattern>
+          <option name="PATTERN" value="core.tasks.*" />
+          <option name="ENABLED" value="true" />
+        </pattern>
+      </extension>
+      <option name="PACKAGE_NAME" value="core.tasks" />
+      <option name="MAIN_CLASS_NAME" value="core.tasks.TaskServiceTest" />
+      <option name="METHOD_NAME" value="loadAllTasks" />
+      <option name="TEST_OBJECT" value="method" />
       <method v="2">
         <option name="Make" enabled="true" />
       </method>
@@ -171,11 +174,11 @@
     </configuration>
     <recent_temporary>
       <list>
-        <item itemvalue="JUnit.TaskServiceTest.deleteTask" />
         <item itemvalue="JUnit.TaskServiceTest" />
-        <item itemvalue="JUnit.TaskRepositoryTest" />
-        <item itemvalue="JUnit.TaskgroupServiceTest" />
-        <item itemvalue="JUnit.TaskServiceTest.createTask" />
+        <item itemvalue="JUnit.TaskServiceTest.loadAllTasks" />
+        <item itemvalue="JUnit.TaskServiceTest.finishTask" />
+        <item itemvalue="JUnit.TaskServiceTest.clearTasks" />
+        <item itemvalue="JUnit.TaskServiceTest.deleteTask" />
       </list>
     </recent_temporary>
   </component>
@@ -471,14 +474,21 @@
       <option name="project" value="LOCAL" />
       <updated>1699694552466</updated>
     </task>
-    <option name="localTasksCounter" value="33" />
+    <task id="LOCAL-00033" summary="Remove entityManager from TaskService">
+      <option name="closed" value="true" />
+      <created>1699695051881</created>
+      <option name="number" value="00033" />
+      <option name="presentableId" value="LOCAL-00033" />
+      <option name="project" value="LOCAL" />
+      <updated>1699695051881</updated>
+    </task>
+    <option name="localTasksCounter" value="34" />
     <servers />
   </component>
   <component name="TypeScriptGeneratedFilesManager">
     <option name="version" value="3" />
   </component>
   <component name="VcsManagerConfiguration">
-    <MESSAGE value="Removed unused TaskgroupShortInfo.java" />
     <MESSAGE value="Fix Foreign Key Constraint Fail when deleting Taskgroups" />
     <MESSAGE value="Stop and Finish TaskSchedules" />
     <MESSAGE value="Include TaskScheduleStopResponse" />
@@ -503,7 +513,8 @@
     <MESSAGE value="Resolve Merge-Conflict" />
     <MESSAGE value="Deleting Task test" />
     <MESSAGE value="Consider increased number of tasks" />
-    <option name="LAST_COMMIT_MESSAGE" value="Consider increased number of tasks" />
+    <MESSAGE value="Remove entityManager from TaskService" />
+    <option name="LAST_COMMIT_MESSAGE" value="Remove entityManager from TaskService" />
   </component>
   <component name="XDebuggerManager">
     <breakpoint-manager>
diff --git a/backend/src/test/java/core/tasks/TaskServiceTest.java b/backend/src/test/java/core/tasks/TaskServiceTest.java
index fed7515..0d30d8c 100644
--- a/backend/src/test/java/core/tasks/TaskServiceTest.java
+++ b/backend/src/test/java/core/tasks/TaskServiceTest.java
@@ -1,6 +1,7 @@
 package core.tasks;
 
 import core.api.models.timemanager.tasks.TaskFieldInfo;
+import core.api.models.timemanager.tasks.TaskScope;
 import core.entities.timemanager.Task;
 import core.entities.timemanager.Taskgroup;
 import core.repositories.timemanager.TaskRepository;
@@ -17,6 +18,7 @@ import javax.persistence.EntityManager;
 import javax.transaction.Transactional;
 
 import java.time.LocalDate;
+import java.util.List;
 
 import static org.assertj.core.api.AssertionsForClassTypes.assertThat;
 import static org.junit.jupiter.api.Assertions.*;
@@ -176,17 +178,101 @@ public class TaskServiceTest {
         assertEquals(ServiceExitCode.OK, result_11.getExitCode());
         assertEquals(task_11, result_11.getResult());
     }
-    /*@Test
+
+    @Test
     @SqlGroup({
             @Sql("classpath:taskgroupRepositoryTestEntries.sql"),
             @Sql("classpath:taskRepositoryEntries.sql")
     })
     void deleteTask() {
-        Task task = entityManager.find(Task.class, 1L);
-        task.getTaskgroup().getTasks().remove(task);
-        taskgroupRepository.save(task.getTaskgroup());
-        Task updatedTask = entityManager.find(Task.class, 1L);
-        taskRepository.deleteByTaskID(entityManager.find(Task.class, 1L).getTaskID());
-        assertThat(entityManager.find(Task.class, 1L)).isNull();
-    }*/
+        for(long i=1; i<=15; i++) {
+            taskService.deleteTask(entityManager.find(Task.class, i));
+            assertThat(entityManager.find(Task.class, i)).isNull();
+        }
+    }
+
+    @Test
+    @SqlGroup({
+            @Sql("classpath:taskgroupRepositoryTestEntries.sql"),
+            @Sql("classpath:taskRepositoryEntries.sql")
+    })
+    void clearTasks() {
+        //Situation 1: Delete from taskgroup with no tasks
+        taskService.clearTasks(entityManager.find(Taskgroup.class, 1L));
+        for(long i=1; i<=15; i++) {
+            assertThat(entityManager.find(Task.class, i)).isNotNull();
+        }
+        //Situation 2: Delete from taskgroup with tasks
+        taskService.clearTasks(entityManager.find(Taskgroup.class, 2L));
+        for(long i=1; i<=15; i++) {
+            assertThat(entityManager.find(Task.class, i)).isNull();
+        }
+    }
+
+    @Test
+    @SqlGroup({
+            @Sql("classpath:taskgroupRepositoryTestEntries.sql"),
+            @Sql("classpath:taskRepositoryEntries.sql")
+    })
+    void finishTask() {
+        taskService.finishTask(entityManager.find(Task.class, 1L));
+        assertTrue(entityManager.find(Task.class, 1L).isFinished());
+
+        taskService.finishTask(entityManager.find(Task.class, 2L));
+        assertTrue(entityManager.find(Task.class, 1L).isFinished());
+    }
+
+    @Test
+    @SqlGroup({
+            @Sql("classpath:taskgroupRepositoryTestEntries.sql"),
+            @Sql("classpath:taskRepositoryEntries.sql")
+    })
+    void loadAllTasks() {
+        //Situation 1: No tasks existing
+        List<Task> result_1 = taskService.loadAllTasks(username2, TaskScope.UNFINISHED);
+        assertEquals(0, result_1.size());
+
+        //Situation 2: Tasks existing, Unfinished#
+        List<Task> result_2 = taskService.loadAllTasks(username, TaskScope.UNFINISHED);
+        assertEquals(8, result_2.size());
+        assertTrue(result_2.contains(entityManager.find(Task.class, 1L)));
+        assertTrue(result_2.contains(entityManager.find(Task.class, 3L)));
+        assertTrue(result_2.contains(entityManager.find(Task.class, 5L)));
+        assertTrue(result_2.contains(entityManager.find(Task.class, 7L)));
+        assertTrue(result_2.contains(entityManager.find(Task.class, 9L)));
+        assertTrue(result_2.contains(entityManager.find(Task.class, 11L)));
+        assertTrue(result_2.contains(entityManager.find(Task.class, 12L)));
+
+        //Situation 3: Finished tasks
+        List<Task> result_3 = taskService.loadAllTasks(username, TaskScope.FINISHED);
+        assertEquals(7, result_3.size());
+        assertTrue(result_3.contains(entityManager.find(Task.class, 2L)));
+        assertTrue(result_3.contains(entityManager.find(Task.class, 4L)));
+        assertTrue(result_3.contains(entityManager.find(Task.class, 6L)));
+        assertTrue(result_3.contains(entityManager.find(Task.class, 8L)));
+        assertTrue(result_3.contains(entityManager.find(Task.class, 10L)));
+        assertTrue(result_3.contains(entityManager.find(Task.class, 13L)));
+        assertTrue(result_3.contains(entityManager.find(Task.class, 14L)));
+
+        //overdue
+        List<Task> result_4 = taskService.loadAllTasks(username, TaskScope.OVERDUE);
+        assertEquals(2, result_4.size());
+        assertTrue(result_4.contains(entityManager.find(Task.class, 3L)));
+        assertTrue(result_4.contains(entityManager.find(Task.class, 5L)));
+
+        //upcoming
+        List<Task> result_5 = taskService.loadAllTasks(username, TaskScope.UPCOMING);
+        assertEquals(2, result_5.size());
+        assertTrue(result_5.contains(entityManager.find(Task.class, 7L)));
+        assertTrue(result_5.contains(entityManager.find(Task.class, 9L)));
+        //Active
+        List<Task> result_6 = taskService.loadAllTasks(username, TaskScope.ACTIVE);
+        assertEquals(6, result_6.size());
+        assertTrue(result_6.contains(entityManager.find(Task.class, 1L)));
+        assertTrue(result_6.contains(entityManager.find(Task.class, 3L)));
+        assertTrue(result_6.contains(entityManager.find(Task.class, 5L)));
+        assertTrue(result_6.contains(entityManager.find(Task.class, 11L)));
+        assertTrue(result_6.contains(entityManager.find(Task.class, 12L)));
+
+    }
 }