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ballot.sol

pragma solidity >=0.4.22 <0.6.0;
contract Ballot {

    struct Voter {
        uint weight;
        bool voted;
        uint8 vote;
        address delegate;
    }
    struct Proposal {
        uint voteCount;
    }

    address chairperson;
    mapping(address => Voter) voters;
    Proposal[] proposals;

    /// Create a new ballot with $(_numProposals) different proposals.
    constructor(uint8 _numProposals) public {
        chairperson = msg.sender;
        voters[chairperson].weight = 1;
        proposals.length = _numProposals;
    }

    /// Give $(toVoter) the right to vote on this ballot.
    /// May only be called by $(chairperson).
    function giveRightToVote(address toVoter) public {
        if (msg.sender != chairperson || voters[toVoter].voted) return;
        voters[toVoter].weight = 1;
    }

    /// Delegate your vote to the voter $(to).
    function delegate(address to) public {
        Voter storage sender = voters[msg.sender]; // assigns reference
        if (sender.voted) return;
        while (voters[to].delegate != address(0) && voters[to].delegate != msg.sender)
            to = voters[to].delegate;
        if (to == msg.sender) return;
        sender.voted = true;
        sender.delegate = to;
        Voter storage delegateTo = voters[to];
        if (delegateTo.voted)
            proposals[delegateTo.vote].voteCount += sender.weight;
        else
            delegateTo.weight += sender.weight;
    }

    /// Give a single vote to proposal $(toProposal).
    function vote(uint8 toProposal) public {
        Voter storage sender = voters[msg.sender];
        if (sender.voted || toProposal >= proposals.length) return;
        sender.voted = true;
        sender.vote = toProposal;
        proposals[toProposal].voteCount += sender.weight;
    }

    function winningProposal() public view returns (uint8 _winningProposal) {
        uint256 winningVoteCount = 0;
        for (uint8 prop = 0; prop < proposals.length; prop++)
            if (proposals[prop].voteCount > winningVoteCount) {
                winningVoteCount = proposals[prop].voteCount;
                _winningProposal = prop;
            }
    }
}

ballot_test.sol

pragma solidity >=0.4.22 <0.6.0;
import "remix_tests.sol"; // this import is automatically injected by Remix.
import "./ballot.sol";

contract test3 {
   
    Ballot ballotToTest;
    function beforeAll () public {
       ballotToTest = new Ballot(2);
    }
    
    function checkWinningProposal () public {
        ballotToTest.vote(1);
        Assert.equal(ballotToTest.winningProposal(), uint(1), "1 should be the winning proposal");
    }
    
    function checkWinninProposalWithReturnValue () public view returns (bool) {
        return ballotToTest.winningProposal() == 1;
    }
}

MyContract.sol

pragma solidity ^0.5.8;

contract MyContract {
    string value;
    
    // expose publicValue can be called outside of the contract
    string public publicValue = "publicValue";
    
    // declare constant property
    string public constant constantValue = "constantValue";
    
    // declare bool property
    bool public myBool = true;
    
    // declare integer property
    int public myInt = -1;
    uint public myUint = 1;
    
    // declare enum
    enum State { Waiting, Ready, Active }
    
    State public state;
    
    // declare struct
    struct Person {
        uint id;
        string firstName;
        string lastName;
    }
    
    Person[] public people;
    uint256 public peopleCount;
    
    // mapping Person to MyContract as a map with key and value
    mapping(uint => Person) public mappingPeople;
    
    // delcare owner property
    address owner;
    modifier onlyOwner() {
        require(msg.sender == owner);
        _;
    }
    
    constructor() public {
        value = "myValue";
        state = State.Waiting;
    }
    
    function getValue() public view returns(string memory) {
        return value;
    }
    
    function setValue(string memory _value) public {
        value = _value;
    }
    
    function activate() public {
        state = State.Active;
    }
    
    function checkIsActive() public view returns(bool) {
        return state == State.Active;
    }
    
    function addPerson(string memory _firstName, string memory _lastName) public {
        people.push(Person(1, _firstName, _lastName));
        peopleCount += 1;
    }
    
    function addPersonMapping(string memory _firstName, string memory _lastName) public onlyOwner{
        incrementCount();
        mappingPeople[peopleCount] = Person(peopleCount, _firstName, _lastName);
    }
    
    // declare internal function like private method in OOP
    // only be invoked in MyContract
    function incrementCount() internal {
        peopleCount += 1;
    }
}