Add tests momery

src/simulator/machine.rs

@@ -410,5 +410,20 @@ impl Machine {
 
 #[cfg(test)]
  mod test {
+    use crate::simulator::machine::Machine;
 
+	#[test]
+	fn test_read_memory() {
+		let mut m = Machine::_init_machine();
+    	m.main_memory[4] = 43;
+    	m.main_memory[5] = 150;
+		assert_eq!((43 << 8) + 150, Machine::read_memory(&mut m, 2, 4));
+	}
+
+	fn test_write_memory() {
+		let mut m = Machine::_init_machine();
+		Machine::write_memory(&mut m, 2, 6, (43 << 8) + 150);
+		assert_eq!(43, m.main_memory[6]);
+		assert_eq!(150, m.main_memory[7]);
+	}
 }