tests: refactor common test infrastructure and fixtures

Change-Id: I597c11130eefa2cc2846ee6655c85dc04f2f22ef
diff --git a/tests/unit/interest.t.cpp b/tests/unit/interest.t.cpp
index 2887c99..e5c7d32 100644
--- a/tests/unit/interest.t.cpp
+++ b/tests/unit/interest.t.cpp
@@ -22,8 +22,7 @@
 #include "ndn-cxx/interest.hpp"
 #include "ndn-cxx/data.hpp"
 
-#include "tests/boost-test.hpp"
-#include "tests/make-interest-data.hpp"
+#include "tests/test-common.hpp"
 
 namespace ndn {
 namespace tests {