Typescript
Testing with LiteSVM

Testing with LiteSVM

使用 TypeScript 的 LiteSVM

litesvm 包提供了核心测试基础设施,用于创建一个轻量级的 Solana 环境,您可以在其中直接操作账户状态并针对您的程序执行交易。

入门

将 LiteSVM 添加到您的项目中:

bash
npm i --save-dev litesvm

LiteSVM 基础

首先声明您的程序 ID 并创建一个 LiteSVM 实例。

使用您在程序中定义的完全相同的程序 ID,以确保交易正确执行并在测试期间不会抛出 ProgramMismatch 错误:

ts
import { LiteSVM } from "litesvm";
import { PublicKey } from "@solana/web3.js";
 
const programId = new PublicKey("22222222222222222222222222222222222222222222");
 
describe("test", () => {
    // Create a new instance of LiteSVM
    const svm = new LiteSVM();
 
    // Load the program with the right public key
    svm.addProgramFromFile(programId, "target/deploy/program.so");
})

要执行测试,请创建一个交易对象并使用 .sendTransaction(tx) 函数:

ts
import { LiteSVM } from "litesvm";
import { Transaction } from "@solana/web3.js";
 
describe("test", () => {
    // Create a new instance of LiteSVM
    const svm = new LiteSVM();
 
    // Create a new Transaction
    const tx = new Transaction();
 
    // Add the latest blockhash
    tx.recentBlockhash = svm.latestBlockhash();
 
    // Add the instructions and the signers
    // tx.add(...ixs);
    // tx.sign(...signersKeypair);
 
    // Send the transaction
    svm.sendTransaction(tx);
})

账户

在使用 LiteSVM 测试 Solana 程序时,您将处理几种类型的账户,这些账户反映了真实世界的程序执行场景。

正确构建这些账户对于有效测试至关重要。

系统账户

最基本的账户类型是系统账户,主要有两种变体:

  • 付款账户:拥有 lamports 的账户,用于资助程序账户创建或 lamport 转账
  • 未初始化账户:没有 lamports 的空账户,通常用于表示等待初始化的程序账户

系统账户不包含数据,并由系统程序拥有。付款账户和未初始化账户的关键区别在于它们的 lamport 余额:付款账户有资金,而未初始化账户从空开始。

以下是在 LiteSVM 中创建 payer 账户的方法:

ts
import { LiteSVM } from "litesvm";
import { Keypair, SystemProgram } from "@solana/web3.js";
 
describe("test", () => {
    // Create a new instance of LiteSVM
    const svm = new LiteSVM();
 
    // Create a new Account
    const account = Keypair.generate();
 
    // Add the Account with the modified data
    svm.setAccount(account.publicKey, {
        lamports: 100_000_000,
        data: Buffer.alloc(0),
        owner: SystemProgram.programId,
        executable: false,
    }); 
})

未初始化账户只是一个普通的生成账户,具有 Keypair.generate() - 无需额外设置。

程序账户

对于包含自定义数据结构的程序账户,您可以使用类似的方法。 您还需要将账户数据序列化到缓冲区中,这可以手动完成,也可以使用诸如 @coral-xyz/borsh 之类的库(参见示例 这里)。

ts
import { LiteSVM } from "litesvm";
import { Keypair } from "@solana/web3.js";
 
describe("test", () => {
    // Create a new instance of LiteSVM
    const svm = new LiteSVM();
 
    // Create a new Account
    const account = Keypair.generate();
 
    // Populate the data of the Account
    const accountData = Buffer.alloc(SIZE_OF_THE_ACCOUNT);
 
    // Serialize the account data into the byte buffer defined above
    // ...
 
    // Grab the minimum amount of lamports to make it rent exempt
    const lamports = svm.minimumBalanceForRentExemption(SIZE_OF_THE_ACCOUNT);
 
    // Add the Account with the modified data
    svm.setAccount(account.publicKey, {
        lamports,
        data: accountData,
        owner: PROGRAM_ID,
        executable: false,
    });
})

在测试中,您无需计算精确的租金。您可以将 lamports 设置为一个较大的值,例如 100_000_000_000,并跳过租金计算,因为这些并不是真实的资金。

代币账户

要序列化 SPL 代币账户的数据,您可以使用 AccountLayoutMintLayout,它们来自 @solana/spl-token

ts
import { LiteSVM } from "litesvm";
import { Keypair } from "@solana/web3.js";
import { TOKEN_PROGRAM_ID, AccountLayout, MintLayout, ACCOUNT_SIZE, MINT_SIZE } from "@solana/spl-token"
 
describe("test", () => {
    // Create a new instance of LiteSVM
    const svm = new LiteSVM();
 
    const owner = Keypair.generate();
 
    // Create a new Mint Account
    const mint = Keypair.generate();
 
    // Populate the data of the Mint Account
    let mintData = Buffer.alloc(MINT_SIZE);
    MintLayout.encode(
        {
          mintAuthorityOption: 1,
          mintAuthority: owner.publicKey,
          supply: BigInt(0),
          decimals: 0,
          isInitialized: true,
          freezeAuthorityOption: 0,
          freezeAuthority: PublicKey.default,
        },
        mintData
    )
 
    // Grab the minimum amount of lamports to make it rent exempt
    const lamports = svm.minimumBalanceForRentExemption(MINT_SIZE);
 
    // Add the Account with the modified data
    svm.setAccount(mint.publicKey, {
        lamports,
        data: mintData,
        owner: TOKEN_PROGRAM_ID,
        executable: false,
    });
 
    // Create a new Token Account
    const tokenAccount = Keypair.generate();
 
    // Populate the data of the Token Account
    const tokenAccountData = Buffer.alloc(ACCOUNT_SIZE);
    AccountLayout.encode(
        {
            mint: mint.publicKey,
            owner: owner.publicKey,
            amount: BigInt(100),
            delegateOption: 0,
            delegate: PublicKey.default,
            delegatedAmount: BigInt(0),
            state: 1,
            isNativeOption: 0,
            isNative: BigInt(0),
            closeAuthorityOption: 0,
            closeAuthority: PublicKey.default,
        },
        tokenAccountData,
    );
 
    // Grab the minimum amount of lamports to make it rent exempt
    const lamports = svm.minimumBalanceForRentExemption(ACCOUNT_SIZE);
 
    // Add the Account with the modified data
    svm.setAccount(tokenAccount.publicKey, {
        lamports,
        data: tokenAccountData,
        owner: TOKEN_PROGRAM_ID,
        executable: false,
    });
})

Execution

在创建账户并将其添加到您的 LiteSVM 实例后,您现在可以发送交易并验证您的程序逻辑。

在发送交易之前,您可以模拟结果:

ts
// Simulate before executing
const simulatedResult = svm.simulateTransaction(tx);

然后发送交易并检查其日志:

ts
// Execute and inspect logs
const result = svm.sendTransaction(tx);
console.log(result.logs);

高级功能

在执行之前和之后,您 LiteSVM 实例中包含的整个账本都是可读和可自定义的。

您可以操作 sysvar 值,例如时钟:

ts
// Change the Clock
const newClock = svm.getClock();
newClock.unixTimestamp = 50n;
svm.setClock(newClock);
 
// Jump to a certain Slot
svm.warpToSlot(500);
 
// Expire the current blockhash
svm.expireBlockhash();

您还可以读取账户和协议数据:

ts
// Get all the information about an account (data, lamports, owner, ...)
svm.getAccount(account.publicKey);
 
// Get the lamport balance of an account
svm.getBalance(account.publicKey);

或者配置运行时的行为:

ts
// Sets the compute budget
const computeBudget = new ComputeBudget();
computeBudget.computeUnitLimit = 2_000_000n;
svm.withComputeBudget(computeBudget);
 
// Sets Sigverify as active
svm.withSigverify(true);
 
// Sets the Blockhash check as active
svm.withBlockhashCheck(true);
 
// Sets the default Sysvars
svm.withSysvars();
 
// Set the FeatureSet to use
svm.withFeatureSet(new FeatureSet(...))
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