print("testing length");
foreach str in {"","1234","1"}
	print("testing '"+str+"' length: "+len(str) );
	if (len(str)!=str.length())
		print("failed size "+len(str)+"!="+str.length());
	endif
endforeach

print("\ntesting join");
var str:=",";
var arr := {1,"2",3.1,4,5};
arr[10]:="test";
var res:=str.join(arr);
print(str);
print(res);
print("\none "+"test".join({1}));

print("\nemptytest '"+ "empty".join({})+"'");

print("\ntesting upper");
str:="asbcxysd";
var orig:=str;
var up:=str.upper();
print(up);
print("\ntesting lower");
print(up.lower());
if (up != orig)
	print("compare failed");
endif

print("\ntesting find");
str:="1234567";
print(str.find("2",1));
print(str.find("2",3));
print(str.find("7"));
print(str.find("1"));
print(str.find("1",1));