Create an Object

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The example below shows an Object X considering it uses an ERC20Contract
1 - Create your X.sol object/objects at contracts/X.sol
pragma solidity >=0.6.0;
​
import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
​
/**
 * @title X Contract
 * @dev A Contract that stores 3 variables
 */
contract X{
    
    string public variable1;
    string public variable2;
    ERC20 public erc20Token;
​
    constructor(       
        string memory _variable1, 
        string memory _variable2,
        ERC20 _tokenAddress) public {
        
        //constructor info
        variable1 = _variable1;
        variable2 = _variable2;
        erc20Token = _tokenAddress;
    }
​
}
2 - Export the interface x at src/interfaces/index.js
/* eslint-disable global-require , import/no-unresolved, import/no-extraneous-dependencies */
const index = {
  ...
  x: require('../contracts/x.json'),
};
​
module.exports = index;
​
3 - Create the javascript wrapper at src/models/X.js
A default version is shown below on how to use the system - you can use it to start your Javascript Wrapper
/* src/models/X.js */
​
import { x } from '../../interfaces';
​
/**
 * X Object
 * @class X
 * @param {X~Options} options
 */
class X extends IContract {
 constructor(params = {}) {
     super({ abi: x, ...params });
   }
   
   
  /**
   * Asserts a new {@link ERC20Contract} on the current address
   * @function
   * @return {Promise<void>}
   * @throws {Error} Contract is not deployed, first deploy it and provide a contract address
   */
  __assert = async () => {
    if (!this.getAddress()) {
      throw new Error(
        'Contract is not deployed, first deploy it and provide a contract address',
      );
    }
​
    // Use ABI
    this.params.contract.use(x, this.getAddress());
​
    // Set Token Address Contract for easy access
    this.params.ERC20Contract = new ERC20Contract({
      web3Connection: this.web3Connection,
      contractAddress: params.tokenAddress,
    });
​
    // Assert Token Contract
    await this.params.ERC20Contract.__assert();
  };
  
  /**
   * Action1
   * @function
   * @param {Object} params Parameters
   * @param {number} params.itemId Item Id
   * @returns {Promise<Transaction>} Transaction
   */
  action1 = async ({ itemId }) => await this.__sendTx(
    this.params.contract.getContract().methods.action1(itemId),
  );
  
    /**
   * User deploys the contract
   * @function
   * @param {Object} params Parameters
   * @param {string} params.variable1 Variable 1 of the Contract
   * @param {string} params.variable2 Variable 2 of the Contract
   * @param {Address} params.tokenAddress token Address of the purchase Token in use
   * @returns {Promise<boolean>} Success the Tx Object if operation was successful
   */
  deploy = async ({
    variable1, variable2, tokenAddress, callback,
  }) => {
    const params = [variable1, variable2, tokenAddress];
    const res = await this.__deploy(params, callback);
    this.params.contractAddress = res.contractAddress;
    /* Call to Backend API */
    await this.__assert();
    return res;
  };
​
  /**
   * @function
   * @return ERC20Contract|undefined
   */
  getERC20Contract = () => this.params.ERC20Contract;
​
}
​
export default X;
4 - Export the Object at src/models/index.js
src/models/index.js
...
import X from './X';
​
export {
  ...
  X
}
5 - Create Unit tests tests/x.js
The Template below should be used to start the object of unit tests
tests/x.js
import { expect, assert } from "chai";
import moment from "moment";
import delay from "delay";
import { mochaAsync } from "./utils";
import { ERC20Contract, X } from "..";
import Numbers from "../src/utils/Numbers";
​
const testConfig = {test : true, localtest : true};
​
context("X Contract", async () => {
  let erc20Contract;
  let xContract;
  let deployed_tokenAddress, contractAddress, deployed_contractAddress;
  let userAddress;
​
  before(async () => {
    erc20Lock = new xContract(testConfig);
    userAddress = await xContract.getUserAddress(); // local test with ganache
  });
​
  it(
    "should deploy a new ERC20Contract",
    mochaAsync(async () => {
      // Create Contract
      erc20Contract = new ERC20Contract(testConfig);
      expect(erc20Contract).to.not.equal(null);
      // Deploy
      let res = await erc20Contract.deploy({
        name: "test",
        symbol: "test",
        cap: Numbers.toSmartContractDecimals(100000000, 18),
        distributionAddress: userAddress, 
      });
      await erc20Contract.__assert();
      deployed_tokenAddress = erc20Contract.getAddress();
      expect(res).to.not.equal(false);
      expect(deployed_tokenAddress).to.equal(res.contractAddress);
    })
  );
​
  it(
    "should start the X",
    mochaAsync(async () => {
      xContract = new X(testConfig);
      expect(xContract).to.not.equal(null);
    })
  );
  
  it(
    "should deploy X Contract",
    mochaAsync(async () => {
      // Create Contract
      let testConfig2 = { ...testConfig, tokenAddress: deployed_tokenAddress };
      xContract = new X(testConfig2);
      // Deploy
      let res = await x.deploy();
      await x.__assert();
      
      contractAddress = erc20Lock.getAddress();
      deployed_contractAddress = erc20Lock.getAddress();
      assert.equal(
        deployed_tokenAddress,
        erc20Lock.getERC20Contract().getAddress(),
        "token address should match"
      );
      expect(res).to.not.equal(false);
    })
  );
  
  
  it(
    "should set do action1",
    mochaAsync(async () => {
      // maxTokenAmount = 7000;
      let res = await xContract.action1({
        itemId: 1,
      });
      
      expect(res).to.not.equal(false);
    })
  );
}
​
6 - Import them at tests/index.js
src/models/index.js
context("Unit Tests", async () => {
  ...
  require("./x");
});
​
7 - To test open 2 terminals
Terminal 1 (Running Ganache Local EVM)
npm run ganache:start
Terminal 2 (Running the unit tests created)
npm run test
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