In Move, you save time and prevent bugs by writing unit tests that focus on key functionality and edge cases. Instead of trying to exhaustively test everything upfront, it’s often more practical to start with minimal tests for core behaviors—like resource transfers, access control, or state mutations—and then iterate as your module grows. Use mock objects or temporary signer accounts to simulate different users and interactions without affecting global state. For example, mint coins to a test signer or create mock Vaults to validate access control. The Move testing framework also allows you to assert invariants and expected aborts, which helps catch errors early. By combining iterative testing with controlled mocks, you can verify logic, prevent resource misuse, and ensure your contracts behave securely before deploying. You can read more here: Move Unit Testing.

#[test]
fun test_transfer() {
    let sender = create_signer();
    let recipient = create_signer();
    let coin = mint_coin(sender);
    transfer_coin(&sender, recipient.address, coin);
    assert!(get_balance(recipient) == 1);
}