How to airdrop to a randomly generated keypair for tests?

Question

#[test]
fn test_create_user_pda() {
    let wallet = solana_sdk::signer::keypair::Keypair::new();

I want to use this wallet as a payer, how do I make an airdrop in a test?

Attempt to debit an account but found no record of a prior credit

Answer 1

You cant fund a wallet and use it to sign the same tx its being funded in.

Answer 2

For those who need this functionality, the only solution that actually worked for me was to spawning a new process executing solana airdrop command inside a test:

Command::new("solana")
        .arg("airdrop")
        .arg("--commitment")
        .arg("finalized")
        .arg("1")
        .arg(format!("{}", wallet_pubkey.to_string()))
        .spawn()
        .unwrap()
        .wait()
        .unwrap();

--commitment finalized will take more time than normally, but it's essential - otherwise we move on before the account is created.

For whatever reason, calling airdrop via RPC client with the same commitment config didn't actually wait for the transaction to finalize.