Cook the pasta according to packet instructions. Drain and set aside to cool slightly.
In a large bowl, add the tuna and gently flake it apart with a fork.
Add the cherry tomatoes and bocconcini.
Tear the lettuce into bite - sized pieces and add to the bowl.
Once the pasta has cooled, add it to the bowl. (Avoid adding it while hot, as it will wilt the lettuce.)
Drizzle with olive oil - just enough to lightly coat everything.
Season with salt to taste and gently mix to combine.