embark/test_dapps/test_app/test/config_spec.js

/*global embark, config, it, web3*/
const assert = require('assert');

let gasUsedForDeploy = 0;
let gasPrice = 1;
let accounts;

config({
  deployment: {
    accounts: [
      // you can configure custom accounts with a custom balance
      // see https://embark.status.im/docs/contracts_testing.html#Configuring-accounts
      {
        privateKey: "random",
        balance: "100000 ether"
      }
    ]
  },
  contracts: {
    "Token": {
      deploy: false,
      args: [1000]
    },
    "MyToken2": {
      instanceOf: "Token",
      args: [2000]
    },
    "SomeContract": {
      "args": [
        ["$MyToken2", "$accounts[0]"],
        100
      ]
    },
    "SimpleStorage": {
      args: [100]
    }
  }
}, (_err, web3_accounts) => {
  accounts = web3_accounts;
});

// must be declared outside of the 'before' block, otherwise
// the 'block:header' event does not fire
embark.events.on("block:header", (blockHeader) => {
  gasUsedForDeploy += blockHeader.gasUsed;
});

describe("Account balance", function () {
  before(function (done) {
    embark.events.request("blockchain:gasPrice", (err, blkGasPrice) => {
      if (err) {
        return next(new Error(__("could not get the gas price")));
      }
      gasPrice = parseInt(blkGasPrice, 10);
      done();
    });
  });
  it('should create an account balance from a large ether value in config', async function () {
    const shouldBeWeiBN = web3.utils.toBN('100000000000000000000000');
    const actualBalanceWei = await web3.eth.getBalance(accounts[0]);
    const actualBalanceWeiBN = web3.utils.toBN(actualBalanceWei);
    const gasUsedWeiBN = web3.utils.toBN((gasUsedForDeploy * gasPrice).toString());
    const totalBalanceWeiBN = actualBalanceWeiBN.add(gasUsedWeiBN);
    assert.ok(totalBalanceWeiBN.gte(shouldBeWeiBN), "Total balance (account balance + deployment costs) should be greater than or equal to 100K ether");
  });
});