Sample Solidity contract

Sampler.sol

pragma solidity ^0.4.25;

contract Sampler {
  string public name = "Sample Contract";
  address public owner = msg.sender;
  
  event NewOwner(address indexed newOwner);
  
  modifier onlyOwner {
    require(msg.sender == owner, "Sender is not the Owner");
    _;
  }
  
  function changeOwner(address _newOwner) onlyOwner public {
    owner = _newOwner;
    emit NewOwner(_newOwner);
  }
}

Sampler_test.sol

pragma solidity ^0.4.0;
import "remix_tests.sol"; // this import is automatically injected by Remix.
import "./Sampler.sol";

contract SamplerTest {
    Sampler sampler;
    function beforeAll () public {
        sampler = new Sampler();
    }
    
    function checkName () public {
        bytes32 name;
        string memory givenName = sampler.name();
        assembly {
            name := mload(add(givenName, 32))
        }
        Assert.equal(name, bytes32("Sample Contract"), "Name not set");
    }
    
    function checkOwner () public {
        Assert.equal(sampler.owner(), address(this), "Not the owner");
    }
}