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ballot.sol

pragma solidity ^0.4.0;

contract Inbox {
    string public message;

    function Inbox(string initialMessage) public {
        message = initialMessage;
    }

    function setMessage(string newMessage) public {
        message = newMessage;
    }
}

ballot_test.sol

pragma solidity ^0.4.7;
import "remix_tests.sol"; // this import is automatically injected by Remix.
import "./ballot.sol";

contract test3 {
   
    Ballot ballotToTest;
    function beforeAll () {
       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 constant returns (bool) {
        return ballotToTest.winningProposal() == 1;
    }
}

Inbox.sol

pragma solidity ^0.4.0;

contract Inbox {
    string public message;

    function Inbox(string initialMessage) public {
        message = initialMessage;
    }

    function setMessage(string newMessage) public {
        message = newMessage;
    }
}

Lottery.sol

pragma solidity ^0.4.17;

contract Lottery {
    address public manager;
    address[] public players;
    
    function Lottery() public {
        manager = msg.sender;
    }
    
    function enter() public payable {
        require(msg.value > 0.01 ether);
        
        players.push(msg.sender);
    }
    
    function random() private view returns (uint) {
        return uint(keccak256(block.difficulty, now, players));
    }
    
    function pickWinner() public {
        uint index = random() % players.length;
        players[index].transfer(this.balance);
    }
}