Added tests and made compiling the example optional.

CMakeLists.txt

@@ -1,8 +1,11 @@
 cmake_minimum_required (VERSION 3.1)
 project(xdgcfg
-        VERSION 0.3.0
-        LANGUAGES CXX
-)
+  VERSION 0.3.1
+  LANGUAGES CXX
+  )
+
+set(WITH_EXAMPLES "NO" CACHE STRING "WITH_EXAMPLES defaults to \"NO\"")
+set(WITH_TESTS "NO" CACHE STRING "WITH_TESTS defaults to \"NO\"")
 
 include(GNUInstallDirs)
 find_package(PkgConfig REQUIRED)
@@ -23,8 +26,17 @@ include_directories(${LIBCONFIG_INCLUDE_DIRS})
 link_directories(${LIBXDG_BASEDIR_LIBRARY_DIRS})
 link_directories(${LIBCONFIG_LIBRARY_DIRS})
 
-add_executable(example src/example.cpp)
-target_link_libraries(example
+set(COMMON_LIBRARIES
   ${LIBXDG_BASEDIR_LIBRARIES} ${LIBCONFIG_LIBRARIES} stdc++fs)
 
+if (WITH_EXAMPLES)
+  add_executable(example src/example.cpp)
+  target_link_libraries(example
+    ${COMMON_LIBRARIES})
+endif()
+
+if(WITH_TESTS)
+  add_subdirectory(tests)
+endif()
+
 install(FILES src/xdgcfg.hpp DESTINATION ${CMAKE_INSTALL_INCLUDEDIR})

tests/CMakeLists.txt

@@ -0,0 +1,24 @@
+include(CTest)
+file(GLOB sources_tests test_*.cpp)
+
+find_package(Catch2)
+if(Catch2_FOUND)    # Catch 2.x
+  include(Catch)
+  add_executable(all_tests main.cpp ${sources_tests})
+  target_link_libraries(all_tests Catch2::Catch2 ${COMMON_LIBRARIES})
+  target_include_directories(all_tests PRIVATE "/usr/include/catch2")
+  catch_discover_tests(all_tests EXTRA_ARGS "${EXTRA_TEST_ARGS}")
+else()              # Catch 1.x
+  if(EXISTS "/usr/include/catch.hpp")
+    message(STATUS "Catch 1.x found.")
+    foreach(src ${sources_tests})
+      get_filename_component(bin ${src} NAME_WE)
+      add_executable(${bin} main.cpp ${src})
+      target_link_libraries(${bin} ${COMMON_LIBRARIES})
+      add_test(${bin} ${bin} "${EXTRA_TEST_ARGS}")
+    endforeach()
+  else()
+    message(FATAL_ERROR
+      "Neither Catch 2.x nor Catch 1.x could be found.")
+  endif()
+endif()

tests/main.cpp

@@ -0,0 +1,5 @@
+/*  This file is part of xdgcfg. */
+
+#define CATCH_CONFIG_MAIN
+
+#include <catch.hpp>

tests/test_write_read.cpp

@@ -0,0 +1,56 @@
+/*  This file is part of xdgcfg. */
+
+#include <exception>
+#include <string>
+#include <catch.hpp>
+#include "../src/xdgcfg.hpp"
+
+using std::string;
+
+SCENARIO ("A config file can be written and then read.")
+{
+    bool exception = false;
+
+    WHEN ("Writing config")
+    {
+        xdgcfg config("test.cfg", "xdgcfg");
+        libconfig::Config &cfg = config.get_cfg();
+        libconfig::Setting &root = cfg.getRoot();
+
+        try
+        {
+            root.add("Hello", libconfig::Setting::TypeString) = "World! 🙂";
+            config.write();
+        }
+        catch (const std::exception &e)
+        {
+            exception = true;
+        }
+
+        THEN ("No exception is thrown")
+        {
+            REQUIRE_FALSE(exception);
+        }
+
+        WHEN ("Reading config")
+        {
+            string value;
+
+            try
+            {
+                value = root["Hello"].c_str();
+            }
+            catch (const std::exception &e)
+            {
+                exception = true;
+            }
+
+            THEN ("No exception is thrown")
+                AND_THEN ("Value is correct")
+            {
+                REQUIRE_FALSE(exception);
+                REQUIRE(value == "World! 🙂");
+            }
+        }
+    }
+}