README.md

Destroy an Account

1. We're creating a PDA using create_user.rs instruction.

   #[account(
   init,
   seeds=[User::PREFIX.as_bytes(), user.key().as_ref()],
   payer=user,
   space=User::SIZE,
   bump
   )]
   pub user_account: Box<Account<'info, User>>,

2. We're closing it using destroy_user.rs instruction, which uses Anchor AccoutClose trait.

   user_account.close(user.to_account_info())?;

3. In our test destroy-an-account.ts we're using fetchNullable since we expect the account to be null prior to creation and after closing.

   const userAccountBefore = await program.account.user.fetchNullable(userAccountAddress, "processed");
   assert.equal(userAccountBefore, null);
   ...
   ...
   const userAccountAfter = await program.account.user.fetchNullable(userAccountAddress, "processed");
   assert.notEqual(userAccountAfter, null);