old_contents: const assertJump = require('./helpers/assertJump');
  
  var BasicTokenMock = artifacts.require("./helpers/BasicTokenMock.sol");
  
  contract('BasicToken', function(accounts) {
  
    it("should return the correct totalSupply after construction", async function() {
      let token = await BasicTokenMock.new(accounts[0], 100);
      let totalSupply = await token.totalSupply();
  
      assert.equal(totalSupply, 100);
    })
  
    it("should return correct balances after transfer", async function(){
      let token = await BasicTokenMock.new(accounts[0], 100);
      let transfer = await token.transfer(accounts[1], 100);
  
      let firstAccountBalance = await token.balanceOf(accounts[0]);
      assert.equal(firstAccountBalance, 0);
  
      let secondAccountBalance = await token.balanceOf(accounts[1]);
      assert.equal(secondAccountBalance, 100);
    });
  
    it('should throw an error when trying to transfer more than balance', async function() {
      let token = await BasicTokenMock.new(accounts[0], 100);
      try {
        let transfer = await token.transfer(accounts[1], 101);
        assert.fail('should have thrown before');
      } catch(error) {
        assertJump(error);
      }    
    });
  
    it('should throw an error when trying to transfer to 0x0', async function() {
      let token = await StandardTokenMock.new(accounts[0], 100);
      try {
        let transfer = await token.transfer(0x0, 100);
        assert.fail('should have thrown before');
      } catch(error) {
        assertJump(error);
      }
    });
  
  });
  
new_contents: const assertJump = require('./helpers/assertJump');
  
  var BasicTokenMock = artifacts.require("./helpers/BasicTokenMock.sol");
  
  contract('BasicToken', function(accounts) {
  
    it("should return the correct totalSupply after construction", async function() {
      let token = await BasicTokenMock.new(accounts[0], 100);
      let totalSupply = await token.totalSupply();
  
      assert.equal(totalSupply, 100);
    })
  
    it("should return correct balances after transfer", async function(){
      let token = await BasicTokenMock.new(accounts[0], 100);
      let transfer = await token.transfer(accounts[1], 100);
  
      let firstAccountBalance = await token.balanceOf(accounts[0]);
      assert.equal(firstAccountBalance, 0);
  
      let secondAccountBalance = await token.balanceOf(accounts[1]);
      assert.equal(secondAccountBalance, 100);
    });
  
    it('should throw an error when trying to transfer more than balance', async function() {
      let token = await BasicTokenMock.new(accounts[0], 100);
      try {
        let transfer = await token.transfer(accounts[1], 101);
        assert.fail('should have thrown before');
      } catch(error) {
        assertJump(error);
      }    
    });
  
    it('should throw an error when trying to transfer to 0x0', async function() {
      let token = await BasicTokenMock.new(accounts[0], 100);
      try {
        let transfer = await token.transfer(0x0, 100);
        assert.fail('should have thrown before');
      } catch(error) {
        assertJump(error);
      }
    });
  
  });
  
subject: fix reference to mock contract