tests: sync common testing infrastructure with ndn-cxx

Change-Id: I6feab5247231abc35b8daa96bca21ad17c9cc4b3
diff --git a/tests/tools/nfdc/forwarder-general-module.t.cpp b/tests/tools/nfdc/forwarder-general-module.t.cpp
index ad282a3..5d2255b 100644
--- a/tests/tools/nfdc/forwarder-general-module.t.cpp
+++ b/tests/tools/nfdc/forwarder-general-module.t.cpp
@@ -1,6 +1,6 @@
 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
 /*
- * Copyright (c) 2014-2019,  Regents of the University of California,
+ * Copyright (c) 2014-2020,  Regents of the University of California,
  *                           Arizona Board of Regents,
  *                           Colorado State University,
  *                           University Pierre & Marie Curie, Sorbonne University,
@@ -27,8 +27,6 @@
 
 #include "status-fixture.hpp"
 
-#include <ndn-cxx/security/signing-helpers.hpp>
-
 namespace nfd {
 namespace tools {
 namespace nfdc {