Create a random world :)

src/world.rs

@@ -1,5 +1,30 @@
+use rand::Rng;
+
 /// The World is represented here.
 pub struct World {
     pub x: i32,
     pub y: i32,
 }
+
+/// Create a random World.
+pub fn random_world() -> World {
+    let mut rng = rand::thread_rng();
+    let z = rng.gen_range(5, 50);
+    World { x: z, y: z }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use std::any::type_name;
+
+    fn type_of<T>(_: T) -> &'static str {
+        type_name::<T>()
+    }
+
+    #[test]
+    fn test_random_world() {
+        let w = random_world();
+        assert_eq!(type_of(w), "dancing_droid::world::World");
+    }
+}