CON-3823 add unit test instructions to road-intersection

subjects/road_intersection/README.md

@@ -111,6 +111,15 @@ You will use your keyboard to spawn vehicles for your simulation. You will use t
 
 > A safe distance is any distance which enables the vehicles to avoid crashing into each other.
 
+### Unit Tests
+
+You must implement unit tests within your `road_intersection` project to ensure your traffic logic and vehicle physics are sound. Specifically, your tests should:
+
+- Verify the **Dynamic Congestion Rule** by ensuring the `capacity` calculation correctly uses the `lane_length`, `vehicle_length`, and `safety_gap` variables.
+- Verify that a vehicle correctly identifies a "stop" condition when the distance to the vehicle in front is less than or equal to the `safety_gap`.
+- Test the **Traffic Light Controller** to ensure that the algorithm never allows green lights for conflicting paths (e.g., North-South and East-West) simultaneously.
+- Verify **Route Persistence** by testing that once a vehicle is assigned a route (Left, Right, or Straight), its internal state remains consistent and does not change during the simulation.
+
 ### Example
 
 You can see an example for road_intersection [here](https://www.youtube.com/watch?v=6B0-ZBET6mo).

subjects/road_intersection/audit/README.md

@@ -94,6 +94,16 @@
 
 ###### Do vehicles proceed whenever there is a green light?
 
+#### Unit Tests
+
+###### Do all tests pass without errors?
+
+###### Are there specific tests for the **Dynamic Congestion Rule** (e.g., verifying capacity calculation and green light extension)?
+
+###### Are there tests for **Vehicle Physics**, such as checking if a car stops correctly when a `safety_gap` is breached?
+
+###### Are there tests for the **Traffic Light Controller** to ensure no two perpendicular lanes have a green light at the same time?
+
 #### Bonus
 
 ###### +Is there any type of image sprite for traffic light? (An image sprite is a collection of images put into a single image.)