solana-program-examples/basics/counter/anchor/tests/counter_anchor.ts

import * as anchor from "@coral-xyz/anchor"
import { Program } from "@coral-xyz/anchor"
import { Keypair } from "@solana/web3.js"
import { assert } from "chai"
import { CounterAnchor } from "../target/types/counter_anchor"

describe("counter_anchor", () => {
  // Configure the client to use the local cluster.
  const provider = anchor.AnchorProvider.env()
  anchor.setProvider(provider)
  const payer = provider.wallet as anchor.Wallet

  const program = anchor.workspace.CounterAnchor as Program<CounterAnchor>

  // Generate a new keypair for the counter account
  const counterKeypair = new Keypair()

  it("Initialize Counter", async () => {
    await program.methods
      .initializeCounter()
      .accounts({
        counter: counterKeypair.publicKey,
        payer: payer.publicKey,
      })
      .signers([counterKeypair])
      .rpc()

    const currentCount = await program.account.counter.fetch(
      counterKeypair.publicKey
    )

    assert(
      currentCount.count.toNumber() === 0,
      "Expected initialized count to be 0"
    )
  })

  it("Increment Counter", async () => {
    await program.methods
      .increment()
      .accounts({ counter: counterKeypair.publicKey })
      .rpc()

    const currentCount = await program.account.counter.fetch(
      counterKeypair.publicKey
    )

    assert(currentCount.count.toNumber() === 1, "Expected  count to be 1")
  })

  it("Increment Counter Again", async () => {
    await program.methods
      .increment()
      .accounts({ counter: counterKeypair.publicKey })
      .rpc()

    const currentCount = await program.account.counter.fetch(
      counterKeypair.publicKey
    )

    assert(currentCount.count.toNumber() === 2, "Expected  count to be 2")
  })
})