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

Shaun Wetzel
Shaun Wetzel
9,085 Points

Use the @Before method to instantiate a new Calculator and use that instance in each method.

Pretty sure my code is correct but it will not pass.

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 = new Calculator();
    }

    @Test
    public void addingMultipleNumbersProducesResult() throws Exception {
        //Calculator calculator = new Calculator();

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

        assertEquals(6, answer);
    }

    @Test
    public void addingSingleNumberTotalsAppropriately() throws Exception {
        //Calculator calculator = new Calculator();

        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;
    }
}

1 Answer

Jennifer Nordell
seal-mask
STAFF
.a{fill-rule:evenodd;}techdegree
Jennifer Nordell
Treehouse Teacher

Hi there, Shaun Wetzel ! I received a request for assistance and so I took a look at this and it looked correct to me. I ran it through the challenge but it didn't work. On a hunch, I tried entirely deleting the lines that are commented out and it passed!

Short story: delete the commented out lines entirely. I'm not sure why this is happening, but it's causing the challenge to fail. I will bring it up with our education team, though :smiley:

Hope this helps! :sparkles:

Shaun Wetzel
Shaun Wetzel
9,085 Points

Thank you that worked, a silly little bug!