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

Harrison Cassedy
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Harrison Cassedy
Java Web Development Techdegree Graduate 12,031 Points
Posted by Harrison Cassedy
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Harrison Cassedy
Java Web Development Techdegree Graduate 12,031 Points

Use the @Before to not repeat yourself.

I keep trying to solve the code but for some reason I keep getting the error " Please only initialize the Calculator object once in the setUp method that is annotated with @Before"

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 {
        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;
    }
}