feat: add LiteSVM test for hello-solana program

Author: sol-warrior

basics/hello-solana/anchor/tests/litesvm.test.ts

@@ -0,0 +1,55 @@
+import anchor from "@coral-xyz/anchor";
+import {
+	Keypair,
+	PublicKey,
+	Transaction,
+	TransactionInstruction,
+} from "@solana/web3.js";
+import { LiteSVM } from "litesvm";
+import IDL from "../target/idl/hello_solana.json" with { type: "json" };
+
+describe("LiteSVM: hello-solana", () => {
+	const svm = new LiteSVM();
+	const programId = new PublicKey(IDL.address);
+	/**
+	 * Creates a coder to easily build and encode program instructions based on the IDL.
+	 */
+	const coder = new anchor.BorshCoder(IDL as anchor.Idl);
+
+	const payer = Keypair.generate();
+	svm.airdrop(payer.publicKey, BigInt(1000000000));
+
+	/**
+	 * Load the hello_solana program binary into the LiteSVM instance
+	 * for local testing and simulation.
+	 */
+	const programPath = new URL(
+		"../target/deploy/hello_solana.so",
+		import.meta.url,
+	).pathname;
+	svm.addProgramFromFile(programId, programPath);
+
+	it("Say hello!", () => {
+		/**
+		 * Create an instruction for the 'hello' method using the Anchor coder.
+		 * No arguments are needed for this instruction so i give `{}`.
+		 */
+		const data = coder.instruction.encode("hello", {});
+
+		/**
+		 * Build and sign a transaction to call the 'hello' instruction
+		 * on the hello_solana program with LiteSVM.
+		 */
+		const ix = new TransactionInstruction({
+			keys: [],
+			programId,
+			data,
+		});
+
+		const tx = new Transaction().add(ix);
+		tx.feePayer = payer.publicKey;
+		tx.recentBlockhash = svm.latestBlockhash();
+		tx.sign(payer);
+		svm.sendTransaction(tx);
+	});
+});