remove duplicate filtering

src/main/java/ch/zhaw/gartenverwaltung/io/JsonTaskList.java

@@ -86,7 +86,13 @@ public class JsonTaskList implements TaskList {
         if(taskMap.isEmpty()) {
             loadTaskListFromFile();
         }
-        taskMap.values().removeIf(task -> task.getCropId() == cropId);
+
+        List<Task> temptasks = taskMap.values().stream().
+                filter(task -> { return task.getCropId() == cropId;}).toList();
+        for (Task task : temptasks ) {
+                taskMap.remove(task.getId());
+        }
+        writeTaskListToFile();
     }
 
     /**
@@ -106,6 +112,7 @@ public class JsonTaskList implements TaskList {
         if(task.getId() == 0) {
             task.withId(idProvider.incrementAndGet());
         }
+        taskMap.put(task.getId(),task);
         writeTaskListToFile();
     }
 

src/test/java/ch/zhaw/gartenverwaltung/io/JsonTaskListTest.java

@@ -47,17 +47,16 @@ public class JsonTaskListTest {
 
     }
 
-    @Disabled("disabled until adding works.")
     @Test
     @DisplayName("Add task.")
     void addTask() {
-        Task task = new Task("Testtask", "This is a test Task.", LocalDate.parse("01.05.2022", formatter), 1);
+        Task task = new Task("Testtask", "This is a test Task.", LocalDate.parse("2022-05-01", formatter), 1);
         try {
             testDatabase.saveTask(task);
             List<Task> taskList;
             try {
-                taskList = testDatabase.getTaskList(LocalDate.parse("30.04.2022", formatter),
-                        LocalDate.parse("31.05.2022", formatter));
+                taskList = testDatabase.getTaskList(LocalDate.parse("2022-04-30", formatter),
+                        LocalDate.parse("2022-05-31", formatter));
             } catch (IOException e) {
                 throw new RuntimeException(e);
             }
@@ -101,7 +100,6 @@ public class JsonTaskListTest {
 
     }
 
-    @Disabled("Disabled until removing works")
     @Test
     void removeTasksForCrop() {
         List<Task> taskList;