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

Stacy Chambers
Stacy Chambers
1,179 Points
Posted by Stacy Chambers
Stacy Chambers
1,179 Points

getting failures on using @before to not repeat yourself

I am getting failures when trying to run this can some one help? Failures are

addingSingleNumberTotalsAppropriately: null addingMultipleNumbersAppropriatley: null

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

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

import static org.junit.Assert.*;

public class CalculatorTest {
    private Calculator calculator;

    @Before
    public void setUp() throws Exception {

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

2 Answers

Mohammed AlShaiban
Mohammed AlShaiban
6,455 Points

you already declared calculator

 private Calculator calculator;

in the setUp method, you should only write 

calculator = new Calculator();