Add CMake files for the unit tests

- Building unit tests is optional, disabled by default to prevent
  the library clients from pulling the dependency on boost
- Add the unit tests to the Github Actions.
- Use boost::filesystem to manipulate paths for better portability

.github/workflows/linux.yml

@@ -13,12 +13,13 @@ jobs:
       image: fedora:32
     steps:
     - uses: actions/checkout@v2
+
     - name: Install dependencies
-      run: dnf install -yq cmake ninja-build gcc-c++ clang-tools-extra python3-PyYAML
+      run: dnf install -yq cmake ninja-build gcc-c++ clang-tools-extra python3-PyYAML boost-devel
 
     - name: Build with GCC
       run: |
-        cmake -Bbuild -GNinja
+        cmake -Bbuild -GNinja -DP2T_BUILD_TESTS=ON
         cmake --build build
 
     - name: Build with Clang
@@ -28,3 +29,6 @@ jobs:
 
     - name: Lint with clang-tidy
       run: python3 /usr/share/clang/run-clang-tidy.py -header-filter=poly2tri -p=build-clang
+
+    - name: Unit tests
+      run: cd build && ctest --output-on-failure

CMakeLists.txt

@@ -1,8 +1,15 @@
-cmake_minimum_required(VERSION 3.6)
+cmake_minimum_required(VERSION 3.12)
 
 project(poly2tri LANGUAGES CXX)
 set(CMAKE_CXX_STANDARD 14)
 
+option(P2T_BUILD_TESTS "Build tests" OFF)
+
 file(GLOB SOURCES poly2tri/common/*.cc poly2tri/sweep/*.cc)
 add_library(poly2tri ${SOURCES})
 target_include_directories(poly2tri INTERFACE ${CMAKE_CURRENT_SOURCE_DIR})
+
+if(P2T_BUILD_TESTS)
+    enable_testing()
+    add_subdirectory(unittest)
+endif()

meson.build

@@ -10,7 +10,7 @@ lib = static_library('poly2tri', sources : [
 ])
 
 thread_dep = dependency('threads')
-boost_test_dep = dependency('boost', modules : [ 'unit_test_framework' ], required : false)
+boost_test_dep = dependency('boost', modules : [ 'filesystem', 'unit_test_framework' ], required : false)
 if boost_test_dep.found()
 	test('Unit Test', executable('unittest', [
 		'unittest/main.cpp',

unittest/CMakeLists.txt

@@ -0,0 +1,32 @@
+# Dependencies
+if (WIN32)
+    set(Boost_USE_STATIC_LIBS ON)
+endif()
+find_package(Boost 1.69 REQUIRED COMPONENTS
+    filesystem
+    unit_test_framework
+)
+
+# Build Unit Tests
+add_executable(test_poly2tri
+    main.cpp
+    TriangleTest.cpp
+)
+
+target_include_directories(test_poly2tri
+    PRIVATE
+    ${Boost_INCLUDE_DIRS}
+)
+
+target_compile_definitions(test_poly2tri
+    PRIVATE
+    P2T_BASE_DIR="${PROJECT_SOURCE_DIR}"
+)
+
+target_link_libraries(test_poly2tri
+    PRIVATE
+    poly2tri
+    ${Boost_LIBRARIES}
+)
+
+add_test(NAME poly2tri COMMAND test_poly2tri)

unittest/TriangleTest.cpp

@@ -1,3 +1,6 @@
+#ifndef WIN32
+#define BOOST_TEST_DYN_LINK
+#endif
 #include <boost/test/unit_test.hpp>
 #include <poly2tri/common/shapes.h>
 

unittest/main.cpp

@@ -1,5 +1,9 @@
+#ifndef WIN32
 #define BOOST_TEST_DYN_LINK
+#endif
 #define BOOST_TEST_MODULE Poly2triTest
+
+#include <boost/filesystem/path.hpp>
 #include <boost/test/unit_test.hpp>
 #include <poly2tri/poly2tri.h>
 #include <fstream>
@@ -64,9 +68,13 @@ BOOST_AUTO_TEST_CASE(TestbedFilesTest)
     // Load pointset from file
     // Parse and tokenize data file
     std::string line;
-    const std::string src(__FILE__); // ../unittest/main.cpp
-    auto folder = src.substr(0, src.find_last_of('/')) + "/../testbed/data/";
-    std::ifstream myfile(folder + filename);
+#ifndef P2T_BASE_DIR
+    const auto basedir = boost::filesystem::path(__FILE__).remove_filename().parent_path();
+#else
+    const auto basedir = boost::filesystem::path(P2T_BASE_DIR);
+#endif
+    const auto datafile = basedir / boost::filesystem::path("testbed/data") / boost::filesystem::path(filename);
+    std::ifstream myfile(datafile.string());
     BOOST_REQUIRE(myfile.is_open());
     while (!myfile.eof()) {
       getline(myfile, line);