Zugriff auf Vertragsvariablen aus JS-Einheitentests

Ich habe Probleme beim Testen meiner Verträge: Ich verwende Mocha, Chai und Callingtruffle test

Ich testeLoanRecord.sol

contract LoanRecord {
  public bool on;
  ...

  constructor(...){
    ...
    on = false;
   }

  function external turnOn(){
    on = true;
  }
}

Und testen in record.test.js:

var assert = require('chai').assert
var LoanRecord = artifacts.require("../../contracts/record/LoanRecord.sol");

contract ('Record', function (accounts) {
    describe("#turnOn()", function () {
        it("should turn on a loan record instance", async function () {
            loanrecord = await LoanRecord.new(
                1,
                18,
                0x0000000000000000000000000000000000000002,
                0x0000000000000000000000000000000000000001, 
                "LOAN"
                );
            await assert.equal(loanrecord.on, false)
            await loanrecord.turnOn()
            await assert.equal(loanrecord.on, true)
        });
    });

Allerdings erhalte ich:

1) Contract: Record
       #turnOn()
         should turn on a loan record instance:
     AssertionError: expected [Function] to equal false
      at Context.<anonymous> (test/record.js:15:26)
      at <anonymous>
      at process._tickCallback (internal/process/next_tick.js:188:7)

Warum wird eher loanrecord.onzurückgegeben [Function]als ein boolescher Typ?

Behoben (auch mit Hilfe von gitter@dwardu):

contract ('Record', function (accounts) {
    describe("#turnOn()", function () {
        it("should turn on a loan record instance", async function () {
            loanrecord = await LoanRecord.new(
                1,
                18,
                0x0000000000000000000000000000000000000002,
                0x0000000000000000000000000000000000000001, 
                "LOAN"
                );
            var on = await loanrecord.on()
            await assert.equal(on, false)
            await loanrecord.turnOn()
            var on = await loanrecord.on()
            await assert.equal(on, true)
        });
    });
}