junit/02-maths/src/test/java/com/example/maths/MathsTest.java


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package com.example.maths;

import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertThrows;

import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;

public class MathsTest {
    private Maths maths;

    @BeforeEach
    void setUp() {
        maths = new Maths();
    }

    @Test
    void testFactorial() {
        assertEquals(1, maths.factorial(0), "Factorial of 0");
        assertEquals(1, maths.factorial(1), "Factorial of 1");
        assertEquals(120, maths.factorial(5), "Factorial of 5");
    }

    @Test
    void testDivideByZeroThrowsException() {     
        ArithmeticException exception  = assertThrows(ArithmeticException.class, () -> {
            maths.divide(10, 0);
        });

        assertEquals("/ by zero", exception.getMessage());
    }
}