Adding missing test and deleting useless lines

app/models/annotations/task.rb

@@ -137,20 +137,6 @@ def get_file_from_uri(params)
     params
   end
 
-  def existing_files
-    self.first_response_obj&.load&.file.to_a
-  end
-
-  def add_files(new_files)
-    self.file = [self.existing_files].flatten.reject{ |f| f.blank? }.concat(new_files)
-    self.response = '{}'
-  end
-
-  def remove_files(filenames)
-    self.file = [existing_files].flatten.reject{ |f| f.blank? || filenames.include?(f.to_s.split('/').last) }
-    self.response = '{}'
-  end
-
   def first_response_obj
     return @response if @response
     responses = self.responses

test/controllers/graphql_controller_7_test.rb

@@ -452,6 +452,16 @@ def teardown
     assert_equal [pm.id], JSON.parse(@response.body)['data']['project_medias']['edges'].collect{ |x| x['node']['dbid'] }
   end
 
+  test "should update task files" do
+    u = create_user is_admin: true
+    t = create_task
+    f = Rack::Test::UploadedFile.new(File.join(Rails.root, 'test', 'data', 'rails.png'), 'image/png')
+    authenticate_with_user(u)
+    query = 'mutation { updateTask(input: { clientMutationId: "1", id: "' + t.graphql_id + '" }) { task { id } } }'
+    post :create, params: { query: query, team: t.slug, file: { '0' => f } }
+    assert_response :success
+  end
+
   protected
 
   def assert_error_message(expected)