new_contents: import copy
  import os
  
  from ecs_deplojo import main
  
  BASE_DIR = os.path.dirname(os.path.abspath(__file__))
  
  
  def test_register_task_definitions(cluster):
      task_definitions = {
          "service-1": {
              "definition": {
                  "family": "my-task-def",
                  "volumes": [],
                  "containerDefinitions": [
                      {
                          "name": "default",
                          "image": "my-docker-image:1.0",
                          "essential": True,
                          "command": ["hello", "world"],
                          "hostname": "my-task-def",
                          "memory": 256,
                          "cpu": 0,
                          "portMappings": [{"containerPort": 8080, "hostPort": 0}],
                          "environment": {},
                      }
                  ],
                  "tags": [{"key": "createdBy", "value": "ecs-deplojo"}],
              }
          }
      }
      connection = main.Connection()
  
      result = connection.ecs.list_task_definitions()
      assert len(result['taskDefinitionArns']) == 0
  
      main.register_task_definitions(connection, task_definitions)
  
      result = connection.ecs.list_task_definitions()
      assert len(result['taskDefinitionArns']) == 1
  
  
  def test_deregister_task_definitions(cluster):
      task_definitions = {
          "service-1": {
              "definition": {
                  "family": "my-task-def",
                  "volumes": [],
                  "containerDefinitions": [
                      {
                          "name": "default",
                          "image": "my-docker-image:1.0",
                          "essential": True,
                          "command": ["hello", "world"],
                          "hostname": "my-task-def",
                          "memory": 256,
                          "cpu": 0,
                          "portMappings": [{"containerPort": 8080, "hostPort": 0}],
                          "environment": {},
                      }
                  ],
                  "tags": [{"key": "createdBy", "value": "ecs-deplojo"}],
              }
          }
      }
  
      connection = main.Connection()
  
      result = connection.ecs.list_task_definitions()
      assert len(result['taskDefinitionArns']) == 0
  
      for i in range(10):
          task_def = copy.deepcopy(task_definitions)
          main.register_task_definitions(connection, task_def)
  
      result = connection.ecs.list_task_definitions()
      assert len(result['taskDefinitionArns']) == 10
  
      main.deregister_task_definitions(connection, task_def)
      result = connection.ecs.list_task_definitions()
      assert len(result['taskDefinitionArns']) == 1
  
subject: Add a number of unittests for registering and deregistering task definitions