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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

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

you already declared calculator

 private Calculator calculator;

in the setUp method, you should only write

calculator = new Calculator();