Junit Test 1

public class Calculator {
    public double divide(double a , double b)
    {
        return a/b;
    }
}
import org.junit.jupiter.api.Test;

import static org.junit.jupiter.api.Assertions.*;

class CalculatorTest {
    private final Calculator calculator=new Calculator();

    @Test
    void divide() {
        assertEquals(3,calculator.divide(9,3));
        assertEquals(2,calculator.divide(4,2));
        assertEquals(3,calculator.divide(9,4));
    }
}