rover moves forward northward when pointing north

src/main.rs

@@ -1,15 +1,27 @@
 fn main() {
     println!("Hello, world!");
 }
+
+mod rover {
+    #[derive(Debug,PartialEq)]
+    pub enum Facing { N, E, S, W }
+
+    type Rover = (i32, i32, Facing);
+
+    pub fn forward(r : Rover) -> Rover {
+	(1 as i32, 0 as i32, Facing::N)
+    }
+}
+
 #[cfg(test)]
 mod tests {
+    use super::*;
+
     #[test]
     fn rover_run() {
 	assert_eq!(1,1);
-    }
-
-    #[test]
-    fn failure_run() {
-	assert_eq!(1,0);
+	let r = (1 as i32, 1 as i32, rover::Facing::N);
+	assert_eq!(rover::forward(r),
+		   (1 as i32, 0 as i32, rover::Facing::N));
     }
 }