tests/utf8_invalid.cpp

#include <emscripten/emscripten.h>
#include <stdio.h>

int main()
{
	char ch[256] = {};
	for(int i = 0; i < 255; ++i)
		ch[i] = i+1;
	int totalLen = 0;
	for(int i = 0; i < 256; ++i)
		totalLen += EM_ASM_INT({return UTF8ToString($0).length}, ch);
	printf("OK. Length: %d\n", totalLen);
}