Tested Freezable Contract

Freezable.sol

pragma solidity ^0.4.25;

contract Ownable {
  address public owner;


  event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);


  /**
   * @dev The Ownable constructor sets the original `owner` of the contract to the sender
   * account.
   */
  function Ownable() public {
    owner = msg.sender;
  }

  /**
   * @dev Throws if called by any account other than the owner.
   */
  modifier onlyOwner() {
    require(msg.sender == owner);
    _;
  }

  /**
   * @dev Allows the current owner to transfer control of the contract to a newOwner.
   * @param newOwner The address to transfer ownership to.
   */
  function transferOwnership(address newOwner) public onlyOwner {
    require(newOwner != address(0));
    OwnershipTransferred(owner, newOwner);
    owner = newOwner;
  }

}


contract Freezable is Ownable {
  event AccountFrozen(address indexed _account);
  event AccountReleased(address indexed _account);
  
  // freeze status of addresses
  mapping(address=>bool) public frozenAccounts;
  
  
   /**
   * @dev Modifier to make a function callable only when the address is frozen.
   */
  modifier whenAccountFrozen(address _account) {
    require(frozenAccounts[_account] == true);
    _;
  }
  
  /**
   * @dev Modifier to make a function callable only when the address is not frozen.
   */
  modifier whenAccountNotFrozen(address _account) {
    require(frozenAccounts[_account] == false);
    _;
  }
  

  /**
   * @dev Function to freeze an account from transactions
   */
  function freeze(address _account) public onlyOwner whenAccountNotFrozen(_account) returns (bool) {
    frozenAccounts[_account] = true;
    emit AccountFrozen(_account);
    return true;
  }

  /**
   * @dev Function to release an account form frozen state
   */
  function release(address _account) public onlyOwner whenAccountFrozen(_account) returns (bool) {
    frozenAccounts[_account] = false;
    emit AccountReleased(_account);
    return true;
  }
 
}

contract Test is Freezable {
    bool value = false;
    
    function toggleBool() public whenAccountNotFrozen(msg.sender) returns (bool) {
        value = !value;
        return value;
    }
}