errorCatch.java

        return "Fail";//no error found. Contract failed.


    } catch (Exception e) {//catching the error to see if the contract passed
        //check if gotten the expected error
        String exceptionMessage = e.getMessage() != null ? e.getMessage() : "No exception message";
        if (exceptionMessage.contains("Require a single command")) {
            return "Pass"; //expected error found so the contract passes the test
        } else {
            return "Contract failed but with a different Exception: " + e.getMessage();//different error thrown. Contract failed
        }