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

cant figur out code

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 {
    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;
}

}

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 {
        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;
    }
}
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;
    }
}