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SimpleStorage.sol

pragma solidity 0.4.25;

contract SimpleStorage {   
    uint numChicken;    
    
    function set(uint x) public {
        numChicken = x;
    }

    function get() public constant returns (uint) {
        return numChicken;
    }
}

TestSimpleStorage.sol

pragma solidity 0.4.25;

import "./SimpleStorage.sol";

contract TestSimpleStorage is SimpleStorage {

    function test1() public {
        set(56);
        assert(get() == 56);
    }

    function test2() public {
        set(89);
        assert(get() == 89);
    }
}