added tests and example

Author: mguludag

.gitignore

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+build/*

CMakeLists.txt

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+cmake_minimum_required(VERSION 3.14)
+project(get_time_example VERSION 0.1 LANGUAGES CXX)
+
+set(CMAKE_CXX_STANDARD 17)
+
+include(FetchContent)
+
+FetchContent_Declare(
+        fmt
+        GIT_REPOSITORY "https://github.com/fmtlib/fmt"
+        GIT_TAG "9.1.0"
+)
+
+FetchContent_Declare(
+        DocTest
+        GIT_REPOSITORY "https://github.com/onqtam/doctest"
+        GIT_TAG "v2.4.11"
+)
+
+FetchContent_MakeAvailable(fmt)
+FetchContent_MakeAvailable(DocTest)
+
+add_executable(${PROJECT_NAME} example/main.cpp)
+target_link_libraries(${PROJECT_NAME} fmt::fmt)
+target_include_directories(${PROJECT_NAME} AFTER PUBLIC ${CMAKE_SOURCE_DIR}/include)
+
+enable_testing()
+add_subdirectory(test)

example/main.cpp

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+#include "get_time.hpp"
+
+// {fmt} for printing
+#include <fmt/chrono.h>
+#include <fmt/format.h>
+
+int main() {
+    const auto chrono_time = mgutility::get_time("{:%FT%T.%f%z}", "2023-04-16T00:05:23.999+0100");
+
+    fmt::print("{:%F %T}\n", chrono_time); // prints 2023-04-15 23:05:23.999000000 ({fmt} trunk version)
+}

test/CMakeLists.txt

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+cmake_minimum_required(VERSION 3.14)
+project(get_time_test VERSION 0.1 LANGUAGES CXX)
+
+set(CMAKE_CXX_STANDARD 17)
+
+include_directories(AFTER PUBLIC  ${CMAKE_SOURCE_DIR}/include)
+
+add_executable(${PROJECT_NAME} get_time_test.cpp)
+target_link_libraries(${PROJECT_NAME} doctest)

test/get_time_test.cpp

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+#define DOCTEST_CONFIG_IMPLEMENT_WITH_MAIN
+#include "doctest/doctest.h"
+#include "get_time.hpp"
+
+
+TEST_CASE("testing the iso8601 parsing") {
+    CHECK(mgutility::get_time("{:%FT%T}", "2023-04-30T16:22:18").time_since_epoch().count() == 1682871738000000000);
+    CHECK(mgutility::get_time("{:%FT%T%z}", "2023-04-30T18:22:18+0200").time_since_epoch().count() == 1682871738000000000);
+    CHECK(mgutility::get_time("{:%FT%T%z}", "2023-04-30T16:22:18-0200").time_since_epoch().count() == 1682878938000000000);
+    CHECK(mgutility::get_time("{:%FT%T.%f}", "2023-04-30T16:22:18.500").time_since_epoch().count() == 1682871738500000000);
+    CHECK(mgutility::get_time("{:%FT%T.%f%z}", "2023-04-30T16:22:18.500+0100").time_since_epoch().count() == 1682868138500000000);
+}