     test "log_path" do
       add_to_application_env(:log_path, "log/appsignal.log")
       assert valid_configuration |> Map.put(:log_path, "log/appsignal.log") == init_config
+      assert "log/appsignal.log" == System.get_env("APPSIGNAL_LOG_FILE_PATH")
     end
 
     test "endpoint" do
       add_to_application_env(:endpoint, "https://push.staging.lol")
       assert valid_configuration |> Map.put(:endpoint, "https://push.staging.lol") == init_config
+      assert "https://push.staging.lol" == System.get_env("APPSIGNAL_PUSH_API_ENDPOINT")
     end
 
     test "running_in_container" do
       add_to_application_env(:running_in_container, true)
       assert valid_configuration |> Map.put(:running_in_container, true) == init_config
+      assert "true" == System.get_env("APPSIGNAL_RUNNING_IN_CONTAINER")
     end
 
     test "send_params" do

    test "active" do
      add_to_application_env(:active, false)
      assert valid_configuration |> Map.put(:active, false) == init_config
    end

    test "name" do
      add_to_application_env(:name, :my_application)
      assert valid_configuration |> Map.put(:name, :my_application) == init_config
    end

    test "debug" do
      add_to_application_env(:debug, true)
      assert valid_configuration |> Map.put(:debug, true) == init_config
    end

    test "filter_parameters" do

    assert default_configuration == init_config
  end

  describe "using the application environment" do
    setup do
      Application.put_env(
        :appsignal, :config,
