add basic UTFstring API tests

CMakeLists.txt

@@ -110,6 +110,10 @@ if (BUILD_TESTING)
   target_link_libraries(test_infinite PUBLIC ebml)
   add_test(test_infinite test_infinite)
 
+  add_executable(test_utfstring test/test_utfstring.cxx)
+  target_link_libraries(test_utfstring PUBLIC ebml)
+  add_test(test_utfstring test_utfstring)
+
 endif(BUILD_TESTING)
 
 

test/test_utfstring.cxx

@@ -0,0 +1,65 @@
+// Copyright © 2023 Steve Lhomme.
+// SPDX-License-Identifier: ISC
+
+#include <ebml/EbmlUnicodeString.h>
+
+using namespace libebml;
+
+constexpr char emoji_8[] = "\xF0\x9F\x98\x80";
+constexpr wchar_t emoji_w[] = L"\U0001f600";
+
+int main(void)
+{
+    UTFstring ascii{ L"latin1" };
+
+    if (ascii != L"latin1")
+        return 1;
+
+    if (wcscmp(ascii.c_str(), L"latin1") != 0)
+        return 1;
+
+    if (ascii.GetUTF8() != "latin1")
+        return 1;
+
+    UTFstring utf8;
+    utf8.SetUTF8( emoji_8 );
+
+    if (utf8.length() != (4 / sizeof(wchar_t)))
+        return 1;
+
+    if (utf8 != emoji_w)
+        return 1;
+
+    // UTFstring invalid;
+    // FIXME don't crash invalid.SetUTF8( "\x1\xF6\x00" );
+
+    UTFstring empty{0};
+    if (empty.length() != 0)
+        return 1;
+
+    UTFstring padded{L"padded\0\0"};
+    if (padded.length() != 6)
+        return 1;
+
+    if (padded != L"padded")
+        return 1;
+
+    UTFstring copy = utf8;
+    if (copy.length() != (4 / sizeof(wchar_t)))
+        return 1;
+
+    if (copy != emoji_w)
+        return 1;
+
+    if (copy.c_str() == utf8.c_str())
+        return 1;
+
+    UTFstring copy2(utf8);
+    if (copy2 != emoji_w)
+        return 1;
+
+    if (copy2.c_str() == utf8.c_str())
+        return 1;
+
+    return 0;
+}