Mapping of address => uint256 in Struct returning wrong value after transaction in test

Here is my contract:

pragma solidity ^0.4.4; import "./SafeMath.sol"; contract TestContract is SafeMath { struct Result { bytes32 name; uint256 balance; mapping (address => uint256) betBalances; } function TestContract(bytes32[] _resultNames) { for (uint i = 0; i < _resultNames.length; i++) { results.push(Result({ name: _resultNames[i], balance: 0 })); } } function getBetBalance(uint resultIndex) public validResultIndex(resultIndex) constant returns (uint256) { return results[resultIndex].betBalances[msg.sender]; } function bet(uint resultIndex) public hasNotEnded payable { Result storage result = results[resultIndex]; result.balance = safeAdd(result.balance, msg.value); result.betBalances[msg.sender] = safeAdd(result.betBalances[msg.sender], msg.value); } } 

Here is my testing code:

const web3 = global.web3; const TestContract = artifacts.require("./TestContract.sol"); contract('TestContract', function(accounts) { const params = { _owner: accounts[0], _name: "test", _resultNames: ["first", "second", "third"], _bettingEndBlock: 1000 }; let testContract; it("allows users to bet if the betting end block has not been reached", async function() { testContract = await TestContract.new(...Object.values(params)); testContract.BetAccepted().watch((error, response) => { if (error) { console.log("Event Error: " + error); } else { console.log("Event Triggered: " + JSON.stringify(response.event)); console.log("resultIndex: " + JSON.stringify(response.args._resultIndex)); console.log("betAmount: " + JSON.stringify(response.args._betAmount)); console.log("betBalance: " + JSON.stringify(response.args._betBalance)); } }); let initialBalance = web3.eth.getBalance(testContract.address).toNumber(); let betAmount = web3.toWei(1, 'ether'); let betResultIndex = 0; await testContract.bet(betResultIndex, { from: accounts[1], value: betAmount }); let newBalance = web3.eth.getBalance(testContract.address).toNumber(); let difference = newBalance - initialBalance; assert.equal(difference, betAmount, "New result balance does not match added bet."); let resultBalance = await testContract.getResultBalance(betResultIndex); assert.equal(resultBalance, betAmount, "Result balance does not match."); let betBalance = await testContract.getBetBalance(betResultIndex); assert.equal(betBalance.toString(), betAmount, "Bet balance does not match."); }); 

And here is the console error:

/Users/xxx/.config/yarn/global/node_modules/truffle/build/cli.bundled.js:213982 throw reason; ^ AssertionError: Bet balance does not match.: expected '0' to equal '1000000000000000000' at /Users/xxx/coding/xxx/test/topic.js:75:11 at <anonymous> at process._tickCallback (internal/process/next_tick.js:188:7) 

I have confirmed the bet method works by adding an Event and that the betBalance is as it should be (not included in this code). But it is returning as 0 on the testing side. Why is this happening?

I know that transactions aren't able to return values, but is my call to get the resultBalance considered a transaction since I am chaining the call?