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Java Unit Testing in Java How to Test Using Before to not repeat yourself

Posted by mls2017
mls2017
3,153 Points

how to use the @Before method in an excersise

Im out of ideas on the challenge in the Java track about testing

com/example/CalculatorTest.java 
package com.example;

import org.junit.Before;
import org.junit.Test;

import static org.junit.Assert.*;

public class CalculatorTest {

    @Before
    public void setUp() throws Exception {
          calculator = new Calculator();
    }

    @Test
    public void addingMultipleNumbersProducesResult() throws Exception {

        int answer = calculator.addNumbers(1 ,2, 3);

        assertEquals(6, answer);
    }

    @Test
    public void addingSingleNumberTotalsAppropriately() throws Exception {

        int answer = calculator.addNumbers(1);

        assertEquals(1, answer);
    }
}
com/example/Calculator.java 
package com.example;

public class Calculator {

    public int calculator.addNumbers(int... numbers) {
        int total = 0;
        for (int number : numbers) {
            total += number;
        }
        return total;
    }
}

1 Answer

markmneimneh
markmneimneh
14,131 Points

Almost there

you only need to add a private member

public class CalculatorTest {

    private Calculator calculator;       <<<<<<<<<<<<<<<<<< note this

    @Before
    public void setUp() throws Exception {
          calculator = new Calculator();

if this answers your question please mark question as answered.

mls2017
mls2017
3,153 Points

Thanks Mark, that totally worked.