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Given the \"AmIRichAlready\" code below, you could call constant functions using `staticcall`:\n\n```js\nconst contractFactory = new ContractFactory(AmIRichAlready.abi, AmIRichAlready.bytecode, sender);\nconst amIRich = await contractFactory.deploy()\nconst mockERC20 = await deployMockContract(sender, IERC20.abi);\n\nlet result = await mockERC20.staticcall(amIRich, 'check()')\n// you may also just use the function name\nresult = await mockERC20.staticcall(amIRich, 'check')\nexpect(result).to.equal(true) // result will be true if you have enough tokens\n```\n\nYou may also execute transactions through the mock, using `call`:\n\n```js\nconst contractFactory = new ContractFactory(AmIRichAlready.abi, AmIRichAlready.bytecode, sender);\nconst amIRich = await contractFactory.deploy()\nconst mockERC20 = await deployMockContract(sender, IERC20.abi);\n\nlet result = await mockERC20.call(amIRich, 'setRichness(uint256)', 1000)\n// you may also just use the function name\nresult = await mockERC20.call(amIRich, 'setRichness', 1000)\nexpect(await amIRich.richness()).to.equal('1000') // richness was updated\n```\n\n## Example\n\nThe example below illustrates how `mock-contract` can be used to test the very simple `AmIRichAlready` contract.\n\n```Solidity\npragma solidity ^0.6.0;\n\ninterface IERC20 {\n    function balanceOf(address account) external view returns (uint256);\n}\n\ncontract AmIRichAlready {\n    IERC20 private tokenContract;\n    uint public richness = 1000000 * 10 ** 18;\n\n    constructor (IERC20 _tokenContract) public {\n        tokenContract = _tokenContract;\n    }\n\n    function check() public view returns (bool) {\n        uint balance = tokenContract.balanceOf(msg.sender);\n        return balance > richness;\n    }\n\n    function setRichness(uint256 _richness) public {\n      richness = _richness;\n    }\n}\n```\n\nWe are mostly interested in the `tokenContract.balanceOf` call. Mock contract will be used to mock exactly this call with values that are significant for the return of the `check()` method.\n\n```js\nimport {use, expect} from 'chai';\nimport {Contract, ContractFactory, utils, Wallet} from 'ethers';\nimport {MockProvider} from '@ethereum-waffle/provider';\nimport {waffleChai} from '@ethereum-waffle/chai';\nimport {deployMockContract} from '@ethereum-waffle/mock-contract';\n\nimport IERC20 from './helpers/interfaces/IERC20.json';\nimport AmIRichAlready from './helpers/interfaces/AmIRichAlready.json';\n\nuse(waffleChai);\n\ndescribe('Am I Rich Already', () => {\n  let contractFactory: ContractFactory;\n  let sender: Wallet;\n  let receiver: Wallet;\n  let mockERC20: Contract;\n  let contract: Contract;\n\n  beforeEach(async () => {\n    [sender, receiver] = new MockProvider().getWallets();\n    mockERC20 = await deployMockContract(sender, IERC20.abi);\n    contractFactory = new ContractFactory(AmIRichAlready.abi, AmIRichAlready.bytecode, sender);\n    contract = await contractFactory.deploy(mockERC20.address);\n  });\n\n  it('returns false if the wallet has less then 1000000 coins', async () => {\n    await mockERC20.mock.balanceOf.returns(utils.parseEther('999999'));\n    expect(await contract.check()).to.be.equal(false);\n  });\n\n  it('returns true if the wallet has at least 1000000 coins', async () => {\n    await mockERC20.mock.balanceOf.returns(utils.parseEther('1000001'));\n    expect(await contract.check()).to.equal(true);\n  });\n\n  it('reverts if the ERC20 reverts', async () => {\n    await mockERC20.mock.balanceOf.reverts();\n    await expect(contract.check()).to.be.revertedWith('Mock revert');\n  });\n\n  it('returns 1000001 coins for my address and 0 otherwise', async () => {\n    await mockERC20.mock.balanceOf.returns('0');\n    await mockERC20.mock.balanceOf.withArgs(sender.address).returns(utils.parseEther('1000001'));\n\n    expect(await contract.check()).to.equal(true);\n    expect(await contract.connect(receiver.address).check()).to.equal(false);\n  });\n});\n```\n\n# Special thanks\n\nSpecial thanks to @spherefoundry for creating the original [Doppelganger](https://github.com/EthWorks/Doppelganger) project.\n","engines":{"node":">=10.0"},"license":"MIT","private":false,"scripts":{"lint":"eslint '{src,test}/**/*.ts'","test":"export NODE_ENV=test && yarn test:build && mocha","build":"rimraf ./dist && yarn build:sol && yarn build:esm && yarn build:cjs","clean":"rimraf ./dist ./test/example/build","lint:fix":"eslint --fix '{src,test}/**/*.ts'","build:cjs":"tsc -p tsconfig.build.json --outDir dist/cjs --declaration false","build:esm":"tsc -p tsconfig.build.json --outDir dist/esm --module ES6","build:sol":"ts-node compile.ts","test:build":"ts-node ./test/helpers/buildTestContracts.ts"},"_npmUser":{"name":"ethworks","email":"code@trusttoken.com"},"homepage":"https://github.com/EthWorks/Waffle","keywords":["ethereum","smart-contracts","solidity","testing","javascript","typescript","library","mock","double"],"_resolved":"/tmp/0d5d7b10864a7515abcdf8d95dcbd31a/ethereum-waffle-mock-contract-4.0.2-dev.18b219e.tgz","_integrity":"sha512-k04UKg6kMo+CrrzJcxn+hJbc23PE7UAhFtYUaHfGsN2GEjE+rWIcLGxNreGZjXcGA96vLlgkGoNq2oH3kOkf6A==","repository":{"url":"git+ssh://git@github.com/EthWorks/Waffle.git","type":"git"},"_npmVersion":"8.11.0","description":"Mock smart contracts in a smart way.","directories":{},"maintainers":[{"name":"ethworks","email":"code@trusttoken.com"}],"_nodeVersion":"16.16.0","dependencies":{"ethers":"5.6.2","@ethersproject/abi":"^5.6.1"},"publishConfig":{"tag":"dev","access":"public"},"_hasShrinkwrap":false,"readmeFilename":"README.md","devDependencies":{"solc":"0.8.15","mocha":"^8.2.1","eslint":"^7.14.0","rimraf":"^3.0.2","ts-node":"^9.0.0","typechain":"^8.0.0","typescript":"^4.6.2","@ethereum-waffle/chai":"4.0.4-dev.18b219e","@ethereum-waffle/compiler":"4.0.2-dev.18b219e","@ethereum-waffle/provider":"4.0.3-dev.18b219e"},"_npmOperationalInternal":{"tmp":"tmp/mock-contract_4.0.2-dev.18b219e_1659520121831_0.5383005852944314","host":"s3://npm-registry-packages"},"_id":"@ethereum-waffle/mock-contract@4.0.2-dev.18b219e","version":"4.0.2-dev.18b219e"}