Added Google Test for trimstr function with CMake.

Author: XuhuaHuang

Util/CMakeLists.txt

@@ -0,0 +1,10 @@
+cmake_minimum_required(VERSION 3.20)
+
+project(Utility)
+
+set(CMAKE_CXX_STANDARD 23)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+
+# Add sub-directories with CMakeLists.txt in them
+add_subdirectory("stdcxx23/CountLeaves")
+add_subdirectory("tests")

Util/tests/CMakelists.txt

@@ -13,3 +13,25 @@ include_directories(${UTIL_ROOT})
 add_executable(is_instance_of "${UTIL_ROOT}/is_instance_of.hpp" "test_is_instance_of.cpp")
 add_executable(parse_str "${UTIL_ROOT}/parse.hpp" "${UTIL_ROOT}/print_vec.hpp" "test_parse_str.cpp")
 add_executable(safe_free "${UTIL_ROOT}/safe_free.hpp" "test_safe_free.cpp")
+
+# Adding Google Test component
+# Fetch content from GitHub archive
+include(FetchContent)
+FetchContent_Declare(
+    googletest
+    URL https://github.com/google/googletest/archive/03597a01ee50ed33e9dfd640b249b4be3799d395.zip
+)
+
+# For Windows: Prevent overriding the parent project's compiler/linker settings
+set(gtest_force_shared_crt ON CACHE BOOL "" FORCE)
+FetchContent_MakeAvailable(googletest)
+
+enable_testing()
+
+# GoogleTest for trim_str implementation
+add_executable(gtest_trim_str "${UTIL_ROOT}/trimstr.hpp" "gtest_trim_str.cpp")
+target_link_libraries(gtest_trim_str GTest::gtest_main)
+include(GoogleTest)
+
+# Make added executables discoved by GTest
+gtest_discover_tests(gtest_trim_str)

Util/tests/gtest_trim_str.cpp

@@ -0,0 +1,42 @@
+/*****************************************************************//**
+ * \file   gtest_trim_str.cpp
+ * \brief
+ *
+ * \author Xuhua Huang
+ * \date   November 2022
+ *********************************************************************/
+
+#include <iostream>
+#include <gtest/gtest.h>
+#include "trimstr.hpp"
+
+#define STDTEST std::cout << "\033[32m[---TEST---]\033[m "
+
+class TrimStrTest : public ::testing::Test
+{
+public:
+    void SetUp(void) override {}
+    void TearDown(void) override {}
+    TrimStrTest() {}
+    virtual ~TrimStrTest() {}
+};
+
+TEST_F(TrimStrTest, TrimFront_Test)
+{
+    EXPECT_EQ(std::string((std::ranges::to<std::string>("    test" | trim_front)).c_str()), "test");
+}
+
+TEST_F(TrimStrTest, TrimBack_Test)
+{
+    EXPECT_EQ(std::string((std::ranges::to<std::string>("test    " | trim_back)).c_str()), "test");
+}
+
+TEST_F(TrimStrTest, TrimFrontAndBack_Test)
+{
+    EXPECT_EQ(std::string((std::ranges::to<std::string>("    test    " | trim_spaces)).c_str()), "test");
+}
+
+TEST_F(TrimStrTest, TrimStrFn_Test)
+{
+    EXPECT_EQ(trim_str("    test    "), "test");
+}

Util/trimstr.hpp

@@ -3,7 +3,7 @@
  * \brief  Demonstration of handy constant expressions that trim
  *         `std::string` at compile time with `std::ranges`
  *
- * $ g++ trimstr.hpp -o trimstr.o -std=c++23 -Wall -Wextra -Wpedantic
+ * $ g++ trimstr.hpp -std=c++23 -Wall -Wextra -Wpedantic
  *
  * \author Xuhua Huang
  * \date   March 2022
@@ -28,5 +28,6 @@ inline constexpr auto trim_spaces = trim_front | trim_back;
 std::string trim_str(const std::string& str) {
     // std::rangesnext::to in C++23 proposal
     // that converts ranges to a container
-    return str | trim_spaces | std::rangesnext::to<std::string>;
+    // return str | trim_spaces | std::rangesnext::to<std::string>;
+    return std::ranges::to<std::string>(str | trim_spaces);
 }