   end
 
   describe "get_filter_parameters/0" do
+    setup do
+      Application.delete_env(:phoenix, :filter_parameters)
+    end
+
     test "returns parameter filters from the appsignal config" do
       with_config(%{filter_parameters: ["password"]}, fn ->
         Config.initialize()


        assert MapFilter.get_filter_parameters() == ["token", "password"]
      end)

      Application.delete_env(:phoenix, :filter_parameters)
    end
  end


      Application.put_env(:phoenix, :filter_parameters, ~w(password))
      Config.initialize()
      assert MapFilter.get_filter_parameters() == ["password"]
    end

    test "merges AppSignal's parameter filters with Phoenix' parameter filters" do
