Account Setup

Demonstrates seeding account state directly with SetAccount, without executing transactions. This is significantly faster than airdropping + funding through the runtime when you need many accounts ready for a test.

Basic Account Setup

package mytest

import (
    "testing"

    litesvm "github.com/LiteSVM/litesvm-go"
    solana "github.com/gagliardetto/solana-go"
)

func TestBasicAccountSetup(t *testing.T) {
    svm, err := litesvm.New()
    if err != nil {
        t.Fatal(err)
    }
    defer svm.Close()

    // Calculate minimum balance for rent exemption.
    accountData := []byte{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}
    minBalance, err := svm.MinimumBalanceForRentExemption(len(accountData))
    if err != nil {
        t.Fatal(err)
    }
    t.Logf("minimum balance for %d bytes: %d lamports", len(accountData), minBalance)

    // Owner program (system program in this trivial example).
    owner := solana.SystemProgramID
    testAddr := solana.NewWallet().PublicKey()

    // Build the account handle, then store it.
    acct, err := litesvm.NewAccount(minBalance, accountData, owner, false, 0)
    if err != nil {
        t.Fatal(err)
    }
    defer acct.Close()

    if err := svm.SetAccount(testAddr, acct); err != nil {
        t.Fatal(err)
    }
    t.Log("account state set successfully")

    // Retrieve the account back.
    retrieved := svm.GetAccount(testAddr)
    if retrieved == nil {
        t.Fatal("expected account to exist")
    }
    defer retrieved.Close()

    t.Logf("  address:    %s", testAddr)
    t.Logf("  lamports:   %d", retrieved.Lamports())
    t.Logf("  owner:      %s", retrieved.Owner())
    t.Logf("  executable: %v", retrieved.Executable())
    t.Logf("  data:       %v", retrieved.Data())

    // Or just read the balance.
    bal, _, err := svm.Balance(testAddr)
    if err != nil {
        t.Fatal(err)
    }
    t.Logf("balance: %d lamports", bal)
}

Setting Up Multiple Accounts

func TestMultipleAccounts(t *testing.T) {
    svm, err := litesvm.New()
    if err != nil {
        t.Fatal(err)
    }
    defer svm.Close()

    owner := solana.SystemProgramID

    // Set up 5 accounts with different data payloads.
    addrs := make([]solana.PublicKey, 5)
    for i := range addrs {
        addrs[i] = solana.NewWallet().PublicKey()

        data := []byte{byte(i), byte(i + 1), byte(i + 2)}
        rent, err := svm.MinimumBalanceForRentExemption(len(data))
        if err != nil {
            t.Fatal(err)
        }

        acct, err := litesvm.NewAccount(rent, data, owner, false, 0)
        if err != nil {
            t.Fatal(err)
        }
        if err := svm.SetAccount(addrs[i], acct); err != nil {
            acct.Close()
            t.Fatal(err)
        }
        acct.Close()

        t.Logf("account %d: %s", i, addrs[i])
    }

    // Verify each account.
    for i, addr := range addrs {
        a := svm.GetAccount(addr)
        if a == nil {
            t.Fatalf("account %d missing", i)
        }
        t.Logf("  account %d: %d lamports, data[0]=%d", i, a.Lamports(), a.Data()[0])
        a.Close()
    }
}

Program Data Account Setup

Set up a program-owned data account by serializing your struct layout into the account data. This snippet additionally imports encoding/binary:

import "encoding/binary"

func TestProgramDataAccount(t *testing.T) {
    svm, err := litesvm.New()
    if err != nil {
        t.Fatal(err)
    }
    defer svm.Close()

    programID := solana.NewWallet().PublicKey()
    dataAddr := solana.NewWallet().PublicKey()

    // Example layout: [u8 discriminator, u64 counter, 32-byte owner pubkey]
    data := make([]byte, 1+8+32)
    data[0] = 0x01                                      // discriminator
    binary.LittleEndian.PutUint64(data[1:9], 100)       // counter
    // copy(data[9:], ownerPubkey[:])                   // owner

    rent, err := svm.MinimumBalanceForRentExemption(len(data))
    if err != nil {
        t.Fatal(err)
    }

    acct, err := litesvm.NewAccount(rent, data, programID, false, 0)
    if err != nil {
        t.Fatal(err)
    }
    defer acct.Close()

    if err := svm.SetAccount(dataAddr, acct); err != nil {
        t.Fatal(err)
    }

    t.Logf("program data account set up: %s", dataAddr)
}

SetAccount is faster than executing transactions for bulk account setup, and keeps your test code focused on the behavior being tested rather than the plumbing to construct state.

Key Points

Direct state - SetAccount writes account state without going through the runtime.
Rent exemption - use MinimumBalanceForRentExemption to compute lamports before constructing the account.
Ownership - NewAccount returns a handle you still own. The SVM keeps its own copy after SetAccount; close yours when done.
Verification - use GetAccount to read back into a handle, or Balance for a lamports-only check.

Account Setup

Basic Account Setup

Setting Up Multiple Accounts

Program Data Account Setup

Key Points

Inhaltsverzeichnis