CalculatorFixture.java

package com.tddinaction.fit.fixtures;

import com.tddinaction.calculator.Calculator;

public class CalculatorFixture extends fit.ColumnFixture {

    // the "setters" are public fields
    public double left;

    public double right;

    public char operator;

    public CalculatorFixture() {
    }

    // the "getters" are no-argument methods that return something
    public double result() {
        Calculator calculator = Calculator.getInstance();
        switch (operator) {
        case '+':
            return calculator.add(left, right);
        case '-':
            return calculator.subtract(left, right);
        case '*':
            return calculator.multiply(left, right);
        case '/':
            return calculator.divide(left, right);
        default:
            throw new IllegalArgumentException("Unknown operator: "
                    + operator);
        }
    }
}