diff --git a/src/test/java/ch/zhaw/gartenverwaltung/io/JsonPlantListTest.java b/src/test/java/ch/zhaw/gartenverwaltung/io/JsonPlantListTest.java
index b28c486..4ceeb25 100644
--- a/src/test/java/ch/zhaw/gartenverwaltung/io/JsonPlantListTest.java
+++ b/src/test/java/ch/zhaw/gartenverwaltung/io/JsonPlantListTest.java
@@ -95,5 +95,16 @@ public class JsonPlantListTest {
 
     }
 
+    @Test
+    void testDefaultConstructor(){
+        JsonPlantList db = new JsonPlantList();
+        try {
+            assertNotNull(db.getPlantList(HardinessZone.ZONE_8A));
+        } catch (IOException | HardinessZoneNotSetException e) {
+            throw new RuntimeException(e);
+        }
+
+    }
+
 }
 
diff --git a/src/test/java/ch/zhaw/gartenverwaltung/io/JsonTaskListTest.java b/src/test/java/ch/zhaw/gartenverwaltung/io/JsonTaskListTest.java
index 359ea9a..00e21e3 100644
--- a/src/test/java/ch/zhaw/gartenverwaltung/io/JsonTaskListTest.java
+++ b/src/test/java/ch/zhaw/gartenverwaltung/io/JsonTaskListTest.java
@@ -2,6 +2,8 @@ package ch.zhaw.gartenverwaltung.io;
 
 import ch.zhaw.gartenverwaltung.types.Task;
 import org.junit.jupiter.api.*;
+import org.mockito.ArgumentMatchers;
+import org.mockito.Mockito;
 
 import java.io.IOException;
 import java.net.URISyntaxException;
@@ -14,6 +16,8 @@ import java.time.format.DateTimeFormatter;
 import java.util.List;
 
 import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.mockito.Mockito.times;
+import static org.mockito.Mockito.verify;
 
 public class JsonTaskListTest {
 
@@ -113,4 +117,27 @@ public class JsonTaskListTest {
 
         Assertions.assertEquals(0, taskList.size());
     }
+
+    @Test
+    void testDefaultConstructor(){
+        JsonTaskList db = new JsonTaskList();
+        try {
+            assertNotNull(db.getTaskForCrop(0));
+        } catch (IOException e) {
+            throw new RuntimeException(e);
+        }
+
+    }
+
+    @Test
+    void testSubscription() {
+        TaskList.TaskListObserver mockObs = Mockito.mock(TaskList.TaskListObserver.class);
+        testDatabase.subscribe(mockObs);
+        try {
+            testDatabase.removeTasksForCrop(0);
+        } catch (IOException e) {
+            throw new RuntimeException(e);
+        }
+        verify(mockObs, times(1)).onChange(ArgumentMatchers.anyList());
+    }
 }
\ No newline at end of file