Most tests yay

tests/advanced4.rs

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+extern crate rustijvm;
+
+use std::rc::Rc;
+use std::sync::Mutex;
+use std::io::{Cursor, Seek, SeekFrom, Read};
+
+#[test]
+fn advanced4_tanenbaum() {
+    let rc = Rc::new(Mutex::new(Cursor::new(Vec::new())));
+    let mut machine = rustijvm::Machine::new_from_file("files/advanced/Tanenbaum.ijvm").unwrap();
+    machine.set_output(rc.clone());
+    machine.run().unwrap();
+
+    let mut out = rc.lock().unwrap();
+    let mut string = String::new();
+
+    out.seek(SeekFrom::Start(0)).unwrap();
+    out.read_to_string(&mut string).unwrap();
+
+    assert_eq!(string, "OK");
+}