ocean.js/test/TestContractHandler.ts

import { Contract } from 'web3-eth-contract'

const Web3 = require('web3')
const web3 = new Web3("http://127.0.0.1:8545")

export class TestContractHandler {
    public factory: Contract
    public template: Contract
    public accounts: string[]
    public templateBytecode: string
    public factoryBytecode: string
    public factoryAddress: string
    public templateAddress: string

    constructor(
        factoryABI: Contract,
        datatokensABI: Contract,
        templateBytecode: string,
        factoryBytecode: string
    ){
	    this.factory = new web3.eth.Contract(factoryABI)
        this.template = new web3.eth.Contract(datatokensABI)
        this.templateBytecode = templateBytecode
        this.factoryBytecode = factoryBytecode
    }

    public async getAccounts() {
        this.accounts = await web3.eth.getAccounts()
    }
 
	public async deployContracts(minter: string) {
        let estGas

        let blob = 'https://example.com/dataset-1'
        let cap = 1400000000

        // get est gascost
        estGas =  await this.template.deploy({
                           data: this.templateBytecode, 
                           arguments:['Template Contract', 'TEMPLATE', minter, cap, blob]
                          })                       
                          .estimateGas(function(err, estGas){
                                return estGas
                          })
        // deploy the contract and get it's address
        this.templateAddress = await this.template.deploy({
                           data: this.templateBytecode, 
                           arguments:['Template Contract', 'TEMPLATE', minter, cap, blob]
                           })
                           .send({
                               from: minter,
                               gas: estGas+1,
                               gasPrice: '12345678'
                           })
                           .then(function(contract){
                                return contract.options.address
                           })
        
        estGas = await this.factory.deploy({
                           data: this.factoryBytecode, 
                           arguments:[this.templateAddress]
                           })
                          .estimateGas(function(err, estGas){
                                return estGas
                          })
        // deploy the contract and get it's address
        this.factoryAddress = await this.factory.deploy({
                           data: this.factoryBytecode, 
                           arguments:[this.templateAddress]
                           })
                           .send({
                               from: minter,
                               gas: estGas+1,
                               gasPrice: '12345678'
                           })
                           .then(function(contract){
                                return contract.options.address
                           })
    }
}