Add generated snapshots

tests/snapshots/output/grid.snapshot.txt

@@ -0,0 +1,22 @@
+       │ struct Rectangle {
+       │     width: u32,
+       │     height: u32,
+       │ }
+       │ 
+       │ fn main() {
+       │     let rect1 = Rectangle { width: 30, height: 50 };
+       │ 
+       │     println!(
+       │         "The perimeter of the rectangle is {} pixels.",
+       │         perimeter(&rect1)
+       │     );
+       │ }
+       │ 
+       │ fn area(rectangle: &Rectangle) -> u32 {
+       │     rectangle.width * rectangle.height
+       │ }
+       │ 
+       │ fn perimeter(rectangle: &Rectangle) -> u32 {
+       │     (rectangle.width + rectangle.height) * 2
+       │ }
+───────┴────────────────────────────────────────────────────────────────────────