public String runApp(String[] args, String input) throws Exception {
// Save normal System.in and System.out
InputStream sysin = System.in;
PrintStream sysout = System.out;
// Replace System.in with input text
if (input == null) {
input = "";
}
System.setIn(new ByteArrayInputStream(input.getBytes("UTF-8")));
// Replace System.out with OutputStream we can capture
ByteArrayOutputStream out = new ByteArrayOutputStream();
System.setOut(new PrintStream(out));
// Run the app with the List of arguments
App.main(args);
// Replace normal System.in and System.out
System.setIn(sysin);
System.setOut(sysout);
// Return the captured output
return out.toString("UTF-8").trim();
}
