add error-handling functions

They are almost exact copies from my pdb-repo project at
https://github.com/egor-tensin/pdb-repo/tree/fa2afec5e7af45e7f1440b2d32c2a4e63dad6a62

I'm currently thinking about renaming it to winapi-debug BTW.

2 files changed, 24 insertions, 1 deletions

diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
index 3c23426..4c09bcd 100644
--- a/test/CMakeLists.txt
+++ b/test/CMakeLists.txt
@@ -1,6 +1,6 @@
 find_package(Boost REQUIRED COMPONENTS unit_test_framework)
 
-add_executable(unit_tests main.cpp handle.cpp)
+add_executable(unit_tests main.cpp error.cpp handle.cpp)
 target_link_libraries(unit_tests PRIVATE winapi_common)
 target_link_libraries(unit_tests PRIVATE Boost::disable_autolinking Boost::unit_test_framework)
 set_target_properties(unit_tests PROPERTIES OUTPUT_NAME winapi-common-unit-tests)
diff --git a/test/error.cpp b/test/error.cpp
new file mode 100644
index 0000000..f70d95d
--- /dev/null
+++ b/test/error.cpp
@@ -0,0 +1,23 @@
+// Copyright (c) 2020 Egor Tensin <Egor.Tensin@gmail.com>
+// This file is part of the "winapi-common" project.
+// For details, see https://github.com/egor-tensin/winapi-common.
+// Distributed under the MIT License.
+
+#include <winapi/error.hpp>
+
+#include <boost/test/unit_test.hpp>
+
+#include <windows.h>
+
+#include <string>
+
+BOOST_AUTO_TEST_SUITE(error_tests)
+
+BOOST_AUTO_TEST_CASE(file_not_found) {
+    const std::string actual{winapi::error::windows(ERROR_FILE_NOT_FOUND, "CreateFileW").what()};
+    BOOST_TEST(actual ==
+               "Function CreateFileW failed with error code 2: The system cannot find the file "
+               "specified.");
+}
+
+BOOST_AUTO_TEST_SUITE_END()