[CMake] Add self-test for cmake file to travis

test/CMakeLists.txt

@@ -0,0 +1,18 @@
+# Copyright 2018 Mike Dev
+# Distributed under the Boost Software License, Version 1.0.
+# See accompanying file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt
+#
+# NOTE: This does not run the UNIT-TESTS for Boost.PReprocessor.
+#       It only tests, if the CMakeLists.txt file works as expected
+
+cmake_minimum_required( VERSION 3.5 )
+
+project( TestBoostPreprocessorCMakeSelfTest )
+
+add_subdirectory( .. ${CMAKE_CURRENT_BINARY_DIR}/boost_preprocessor )
+
+# arithmetic.cpp is a randomly chosen source file
+# that is compilable on it's own.
+add_executable( boost_preprocessor_self_test cmake_self_test.cpp )
+target_link_libraries( boost_preprocessor_self_test Boost::preprocessor )
+

test/cmake_self_test.cpp

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+#include <boost/preprocessor.hpp>
+
+int main() {}