diff --git a/src/test/java/ch/zhaw/gartenverwaltung/io/JsonCropListTest.java b/src/test/java/ch/zhaw/gartenverwaltung/io/JsonCropListTest.java
index 87763a8..2913ea0 100644
--- a/src/test/java/ch/zhaw/gartenverwaltung/io/JsonCropListTest.java
+++ b/src/test/java/ch/zhaw/gartenverwaltung/io/JsonCropListTest.java
@@ -30,6 +30,7 @@ public class JsonCropListTest {
      */
     private final URL dbDataSource = this.getClass().getResource("test-user-crops.json");
     private final URL testFile = this.getClass().getResource("template-user-crops.json");
+    private final URL corruptTestFile = this.getClass().getResource("corrupt-template-user-crops.json");
 
     @BeforeEach
     void connectToDb() throws URISyntaxException, IOException {
@@ -101,5 +102,13 @@ public class JsonCropListTest {
             throw new RuntimeException(e);
         }
     }
+
+    @Test
+    void detectCorruptJsonResource(){
+        JsonCropList tL = new JsonCropList(corruptTestFile);
+        Assertions.assertThrows(InvalidJsonException.class, () -> {
+            tL.getCrops();
+        });
+    }
 }
 
diff --git a/src/test/java/ch/zhaw/gartenverwaltung/io/JsonPlantListTest.java b/src/test/java/ch/zhaw/gartenverwaltung/io/JsonPlantListTest.java
index 4ceeb25..161ca47 100644
--- a/src/test/java/ch/zhaw/gartenverwaltung/io/JsonPlantListTest.java
+++ b/src/test/java/ch/zhaw/gartenverwaltung/io/JsonPlantListTest.java
@@ -15,6 +15,7 @@ import java.util.Optional;
 import java.util.stream.Collectors;
 
 import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertThrows;
 
 public class JsonPlantListTest {
     private final URL testFile = this.getClass().getResource("test-plantdb.json");
@@ -62,6 +63,8 @@ public class JsonPlantListTest {
     void getPlantByIdAndZone() {
         Optional<Plant> testPlant;
         try {
+            assertThrows(HardinessZoneNotSetException.class, () -> testDatabase.getPlantById(null,1).get());
+
             testPlant = testDatabase.getPlantById(HardinessZone.ZONE_8A, 1);
         } catch (IOException | HardinessZoneNotSetException e) {
             throw new RuntimeException(e);
diff --git a/src/test/java/ch/zhaw/gartenverwaltung/models/GardenScheduleTest.java b/src/test/java/ch/zhaw/gartenverwaltung/models/GardenScheduleTest.java
index 5e32687..0c05e36 100644
--- a/src/test/java/ch/zhaw/gartenverwaltung/models/GardenScheduleTest.java
+++ b/src/test/java/ch/zhaw/gartenverwaltung/models/GardenScheduleTest.java
@@ -188,6 +188,7 @@ class GardenScheduleTest {
 
     @Test
     void planTasksForCrop() throws HardinessZoneNotSetException, PlantNotFoundException, IOException {
+        assertThrows(PlantNotFoundException.class,()-> model.planTasksForCrop(new Crop()));
         model.planTasksForCrop(new Crop(20, exampleStartDate).withId(30));
         verify(exampleTaskTemplateList.get(0), times(1)).generateTask(exampleStartDate, 30);
         verify(exampleTaskTemplateList.get(1), times(1)).generateTask(exampleStartDate, 30);
diff --git a/src/test/resources/ch/zhaw/gartenverwaltung/io/corrupt-template-user-crops.json b/src/test/resources/ch/zhaw/gartenverwaltung/io/corrupt-template-user-crops.json
new file mode 100644
index 0000000..73bf592
--- /dev/null
+++ b/src/test/resources/ch/zhaw/gartenverwaltung/io/corrupt-template-user-crops.json
@@ -0,0 +1,7 @@
+[
+  {
+    "plantId": 1,
+    "startDate": "2023-02-25",
+    "area": 0.5
+  }
+]
\ No newline at end of file