Add wchar.h for wide char overloads

test/wchar-test.cc

@@ -0,0 +1,15 @@
+// Formatting library for C++ - formatting library tests
+//
+// Copyright (c) 2012 - present, Victor Zverovich
+// All rights reserved.
+//
+// For the license information refer to format.h.
+
+#include "fmt/wchar.h"
+
+#include "gtest/gtest.h"
+
+TEST(wchar_test, print) {
+  // Check that the wide print overload compiles.
+  if (fmt::detail::const_check(false)) fmt::print(L"test");
+}