unicode: add unit tests

Signed-off-by: Simon Rozman <simon@rozman.si>

UnitTests/unicode.cpp

@@ -0,0 +1,48 @@
+/*
+	SPDX-License-Identifier: MIT
+	Copyright © 2023 Amebis
+*/
+
+#include "pch.h"
+
+using namespace std;
+using namespace Microsoft::VisualStudio::CppUnitTestFramework;
+
+namespace UnitTests
+{
+	TEST_CLASS(unicode)
+	{
+	public:
+		TEST_METHOD(str2wstr)
+		{
+			Assert::AreEqual(
+				L"This is a test.",
+				stdex::str2wstr("This is a test.", stdex::charset_id::utf8).c_str());
+			Assert::AreEqual(
+				L"Th\u00ed\u0161 i\u22c5 a te\u0073\u0304t. 😀😅",
+				stdex::str2wstr("Thíš i⋅ a tes̄t. 😀😅", stdex::charset_id::utf8).c_str());
+			Assert::AreEqual(
+				L"",
+				stdex::str2wstr("test", 0, stdex::charset_id::utf8).c_str());
+			Assert::AreEqual(
+				L"",
+				stdex::str2wstr(nullptr, 0, stdex::charset_id::utf8).c_str());
+		}
+
+		TEST_METHOD(wstr2str)
+		{
+			Assert::AreEqual(
+				"This is a test.",
+				stdex::wstr2str(L"This is a test.", stdex::charset_id::utf8).c_str());
+			Assert::AreEqual(
+				"Th\xc3\xad\xc5\xa1 i\xe2\x8b\x85 a tes\xcc\x84t. \xf0\x9f\x98\x80\xf0\x9f\x98\x85",
+				stdex::wstr2str(L"Thíš i⋅ a tes̄t. 😀😅", stdex::charset_id::utf8).c_str());
+			Assert::AreEqual(
+				"",
+				stdex::wstr2str(L"test", 0, stdex::charset_id::utf8).c_str());
+			Assert::AreEqual(
+				"",
+				stdex::wstr2str(nullptr, 0, stdex::charset_id::utf8).c_str());
+		}
+	};
+}