update images

src/image_utils.rs

@@ -57,3 +57,65 @@ pub fn is_collision(rect1: (u32, u32, u32, u32), rect2: (u32, u32, u32, u32)) ->
 
     x1 < x2 + w2 && x1 + w1 > x2 && y1 < y2 + h2 && y1 + h1 > y2
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use std::time::Instant;
+
+    #[test]
+    fn test_draw_raindrop() {
+        let width = 10;
+        let height = 10;
+        let mut buffer = vec![0xFFFFFFFF; (width * height) as usize];
+
+        // Initialize Raindrop with current Instant for `last_update` and `start_time`
+        let raindrop = Raindrop {
+            x: 3,
+            y: 3,
+            last_update: Instant::now(),
+            start_time: Instant::now(),
+        };
+
+        draw_raindrop(&mut buffer, width, height, &raindrop);
+
+        // Check if the raindrop was drawn at the correct position
+        for y in 3..(3 + DROP_SIZE) {
+            for x in 3..(3 + DROP_SIZE) {
+                assert_eq!(buffer[(y * width + x) as usize], 0xFFFFFFFF);
+            }
+        }
+    }
+
+    #[test]
+    fn test_draw_square() {
+        let width = 10;
+        let height = 10;
+        let mut buffer = vec![0xFFFFFFFF; (width * height) as usize];
+
+        // Draw a 2x2 red square at (3, 3)
+        draw_square(&mut buffer, width, height, 3, 3, 2);
+
+        // Check if the square was drawn at the correct position
+        for y in 3..5 {
+            for x in 3..5 {
+                assert_eq!(buffer[(y * width + x) as usize], 0xFFFF0000);
+            }
+        }
+    }
+
+    #[test]
+    fn test_is_collision() {
+        // Define two rectangles
+        let rect1 = (0, 0, 2, 2);
+        let rect2 = (1, 1, 2, 2);
+
+        // Check if they collide
+        assert!(is_collision(rect1, rect2));
+
+        // Define a non-colliding rectangle
+        let rect3 = (5, 5, 2, 2);
+        assert!(!is_collision(rect1, rect3));
+    }
+
+}