Problem: no test infrastructure

Solution: integrate googletest, with non-cppzmq test case for a start

ci_build.sh

@@ -25,14 +25,17 @@ if [ "${ZMQ_VERSION}" != "" ] ; then install_zeromq ; fi
 
 # build cppzmq
 
+pushd .
 mkdir build
 cd build
 cmake ..
 sudo make -j4 install
+popd
 
 # build cppzmq tests
-# cd tests
-# mkdir build
-# cd build
-# cmake ..
-# make -j5 test ARGS="-V"
+cd tests
+mkdir build
+cd build
+cmake ..
+cmake --build .
+ctest

external/gtest-demo/INFO.md

@@ -0,0 +1 @@
+googletest integration into CMake and travis-ci was based on https://github.com/bast/gtest-demo

external/gtest-demo/LICENSE

@@ -0,0 +1,27 @@
+Copyright (c) 2015-2018, Radovan Bast
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+* Redistributions of source code must retain the above copyright notice, this
+  list of conditions and the following disclaimer.
+
+* Redistributions in binary form must reproduce the above copyright notice,
+  this list of conditions and the following disclaimer in the documentation
+  and/or other materials provided with the distribution.
+
+* Neither the name of gtest-demo nor the names of its
+  contributors may be used to endorse or promote products derived from
+  this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

tests/CMakeLists.txt

@@ -0,0 +1,43 @@
+cmake_minimum_required(VERSION 3.0 FATAL_ERROR)
+
+project(cppzmq-test CXX)
+
+# place binaries and libraries according to GNU standards
+# TODO check if we should do this
+
+# include(GNUInstallDirs)
+# set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/${CMAKE_INSTALL_LIBDIR})
+# set(CMAKE_LIBRARY_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/${CMAKE_INSTALL_LIBDIR})
+# set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/${CMAKE_INSTALL_BINDIR})
+
+# we use this to get code coverage
+if(CMAKE_CXX_COMPILER_ID MATCHES GNU)
+    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fprofile-arcs -ftest-coverage")
+endif()
+
+include(cmake/googletest.cmake)
+fetch_googletest(
+    ${PROJECT_SOURCE_DIR}/cmake
+    ${PROJECT_BINARY_DIR}/googletest
+    )
+    
+#find_package(cppzmq)
+
+enable_testing()
+
+add_executable(
+    unit_tests
+    example_add.cpp
+    )
+
+target_link_libraries(
+    unit_tests
+    gtest_main
+    )
+
+add_test(
+  NAME
+    unit
+  COMMAND
+    ${CMAKE_BINARY_DIR}/${CMAKE_INSTALL_BINDIR}/unit_tests
+  )

tests/cmake/googletest-download.cmake

@@ -0,0 +1,20 @@
+# code copied from https://crascit.com/2015/07/25/cmake-gtest/
+cmake_minimum_required(VERSION 3.5 FATAL_ERROR)
+
+project(googletest-download NONE)
+
+include(ExternalProject)
+
+ExternalProject_Add(
+  googletest
+  SOURCE_DIR "@GOOGLETEST_DOWNLOAD_ROOT@/googletest-src"
+  BINARY_DIR "@GOOGLETEST_DOWNLOAD_ROOT@/googletest-build"
+  GIT_REPOSITORY
+    https://github.com/google/googletest.git
+  GIT_TAG
+    release-1.8.0
+  CONFIGURE_COMMAND ""
+  BUILD_COMMAND ""
+  INSTALL_COMMAND ""
+  TEST_COMMAND ""
+  )

tests/cmake/googletest.cmake

@@ -0,0 +1,32 @@
+# the following code to fetch googletest
+# is inspired by and adapted after https://crascit.com/2015/07/25/cmake-gtest/
+# download and unpack googletest at configure time
+
+macro(fetch_googletest _download_module_path _download_root)
+    set(GOOGLETEST_DOWNLOAD_ROOT ${_download_root})
+    configure_file(
+        ${_download_module_path}/googletest-download.cmake
+        ${_download_root}/CMakeLists.txt
+        @ONLY
+        )
+    unset(GOOGLETEST_DOWNLOAD_ROOT)
+
+    execute_process(
+        COMMAND
+            "${CMAKE_COMMAND}" -G "${CMAKE_GENERATOR}" .
+        WORKING_DIRECTORY
+            ${_download_root}
+        )
+    execute_process(
+        COMMAND
+            "${CMAKE_COMMAND}" --build .
+        WORKING_DIRECTORY
+            ${_download_root}
+        )
+
+    # adds the targers: gtest, gtest_main, gmock, gmock_main
+    add_subdirectory(
+        ${_download_root}/googletest-src
+        ${_download_root}/googletest-build
+        )
+endmacro()

tests/example_add.cpp

@@ -0,0 +1,8 @@
+#include "gtest/gtest.h"
+
+TEST(example, add)
+{
+    double res;
+    res = 1.0 + 2.0;
+    ASSERT_NEAR(res, 3.0, 1.0e-11);
+}

tests/main.cpp

@@ -0,0 +1,7 @@
+#include "gtest/gtest.h"
+
+int main(int argc, char** argv)
+{
+    ::testing::InitGoogleTest(&argc, argv);
+    return RUN_ALL_TESTS();
+}