solana-program-examples/basics/program-derived-addresses/anchor/tests/test.ts

import * as anchor from "@coral-xyz/anchor"
import { AnchorProgramExample } from "../target/types/anchor_program_example"
import { PublicKey } from "@solana/web3.js"

describe("PDAs", () => {
  const provider = anchor.AnchorProvider.env()
  anchor.setProvider(provider)
  const payer = provider.wallet as anchor.Wallet
  const program = anchor.workspace
    .AnchorProgramExample as anchor.Program<AnchorProgramExample>

  // PDA for the page visits account
  const [pageVisitPDA] = PublicKey.findProgramAddressSync(
    [Buffer.from("page_visits"), payer.publicKey.toBuffer()],
    program.programId
  )

  it("Create the page visits tracking PDA", async () => {
    await program.methods
      .createPageVisits()
      .accounts({
        payer: payer.publicKey,
        pageVisits: pageVisitPDA,
      })
      .rpc()
  })

  it("Visit the page!", async () => {
    await program.methods
      .incrementPageVisits()
      .accounts({
        user: payer.publicKey,
        pageVisits: pageVisitPDA,
      })
      .rpc()
  })

  it("Visit the page!", async () => {
    await program.methods
      .incrementPageVisits()
      .accounts({
        user: payer.publicKey,
        pageVisits: pageVisitPDA,
      })
      .rpc()
  })

  it("View page visits", async () => {
    const pageVisits = await program.account.pageVisits.fetch(pageVisitPDA)
    console.log(`Number of page visits: ${pageVisits.pageVisits}`)
  })
})