nft_collection 0.1.1

A collection protocol for the Token program on the Solana blockchain.
Documentation 
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use solana_program_test::*;
use solana_sdk::{
    program_pack::Pack, 
    pubkey::Pubkey, 
    signature::Signer,
    signer::keypair::Keypair, 
    system_instruction, 
    transaction::Transaction, 
    transport,
};
use spl_associated_token_account::create_associated_token_account;

pub async fn create_mint(
    context: &mut ProgramTestContext,
    mint: &Keypair,
    manager: &Pubkey,
    decimals: u8,
    freeze_authority: Option<&Pubkey>,
) -> transport::Result<()> {
    let rent = context.banks_client.get_rent().await.unwrap();

    let tx = Transaction::new_signed_with_payer(
        &[
            system_instruction::create_account(
                &context.payer.pubkey(),
                &mint.pubkey(),
                rent.minimum_balance(spl_token::state::Mint::LEN),
                spl_token::state::Mint::LEN as u64,
                &spl_token::id(),
            ),
            spl_token::instruction::initialize_mint(
                &spl_token::id(),
                &mint.pubkey(),
                &manager,
                freeze_authority,
                decimals,
            )
            .unwrap(),
        ],
        Some(&context.payer.pubkey()),
        &[&context.payer, &mint],
        context.last_blockhash,
    );

    context.banks_client.process_transaction(tx).await
}

pub async fn mint_tokens(
    context: &mut ProgramTestContext,
    mint: &Pubkey,
    account: &Pubkey,
    amount: u64,
    owner: &Pubkey,
    additional_signer: Option<&Keypair>,
) -> transport::Result<()> {
    let mut signing_keypairs = vec![&context.payer];
    if let Some(signer) = additional_signer {
        signing_keypairs.push(signer);
    }
    let tx = Transaction::new_signed_with_payer(
        &[
            spl_token::instruction::mint_to(&spl_token::id(), mint, account, owner, &[], amount)
                .unwrap(),
        ],
        Some(&context.payer.pubkey()),
        &signing_keypairs,
        context.last_blockhash,
    );

    context.banks_client.process_transaction(tx).await
}

pub async fn create_associated_account(
    context: &mut ProgramTestContext,
    wallet_address: &Pubkey,
    mint_address: &Pubkey,
) -> transport::Result<()> {
    let tx = Transaction::new_signed_with_payer(
        &[
            create_associated_token_account(
                &context.payer.pubkey(),
                &wallet_address,
                &mint_address,
            )
        ],
        Some(&context.payer.pubkey()),
        &[&context.payer],
        context.last_blockhash,
    );

    context.banks_client.process_transaction(tx).await
}