test: create unit tests for NFT contract

test/NFT.spec.ts

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+import { SignerWithAddress } from '@nomiclabs/hardhat-ethers/signers'
+import { expect } from 'chai'
+import { Contract } from 'ethers'
+import { ethers } from 'hardhat'
+
+describe('NFT', () => {
+  const URI = 'sample URI'
+
+  let NFT: Contract
+  let singers: SignerWithAddress[]
+
+  beforeEach(async () => {
+    const NFTFactory = await ethers.getContractFactory('NFT')
+    ;[, ...singers] = await ethers.getSigners()
+    NFT = await NFTFactory.deploy()
+  })
+
+  describe('Deployment', () => {
+    it('Should track name and symbol of the nft collection', async () => {
+      const nftName = 'DApp NFT'
+      const nftSymbol = 'DAPP'
+      expect(await NFT.name()).to.equal(nftName)
+      expect(await NFT.symbol()).to.equal(nftSymbol)
+    })
+  })
+
+  describe('Minting', () => {
+    it('Should track each minted NFT', async function () {
+      const firstSinger = singers[0]
+      const secondSinger = singers[1]
+
+      await NFT.connect(firstSinger).mint(URI)
+      expect(await NFT.tokenCount()).to.equal(1)
+      expect(await NFT.balanceOf(firstSinger.address)).to.equal(1)
+      expect(await NFT.tokenURI(1)).to.equal(URI)
+
+      await NFT.connect(secondSinger).mint(URI)
+      expect(await NFT.tokenCount()).to.equal(2)
+      expect(await NFT.balanceOf(secondSinger.address)).to.equal(1)
+      expect(await NFT.tokenURI(2)).to.equal(URI)
+    })
+  })
+})