/*--- 
    ADAPTED from example at:
        https://github.com/junit-team/junit4/wiki/Getting-started

    adapted by: Sharon Tuttle
    last modified: 2021-12-08
---*/

public class Calculator 
{
    public int evaluate(String expression) 
    {
        int sum = 0;

        for (String summand: expression.split("\\+"))
            sum += Integer.valueOf(summand);

        return sum;
    }
}