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Destroy an Account

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>>,

We're closing it using destroy_user.rs instruction, which uses Anchor AccoutClose trait.
```
user_account.close(user.to_account_info())?;
```

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);

README.md

Destroy an Account