如何在JUnit中测试最高值

public class MathUtils {
    public static int findMax(int[] numbers) {
        if (numbers == null || numbers.length == 0) {
            throw new IllegalArgumentException("Array must not be empty or null");
        }
        int max = numbers[0];
        for (int number : numbers) {
            if (number > max) {
                max = number;
            }
        }
        return max;
    }
}

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

public class MathUtilsTest {

    @Test
    public void testFindMaxWithPositiveNumbers() {
        int[] numbers = {1, 3, 2, 5, 4};
        assertEquals(5, MathUtils.findMax(numbers));
    }

    @Test
    public void testFindMaxWithNegativeNumbers() {
        int[] numbers = {-1, -3, -2, -5, -4};
        assertEquals(-1, MathUtils.findMax(numbers));
    }

    @Test
    public void testFindMaxWithSingleElement() {
        int[] numbers = {7};
        assertEquals(7, MathUtils.findMax(numbers));
    }

    @Test
    public void testFindMaxWithEmptyArray() {
        int[] numbers = {};
        assertThrows(IllegalArgumentException.class, () -> MathUtils.findMax(numbers));
    }

    @Test
    public void testFindMaxWithNullArray() {
        int[] numbers = null;
        assertThrows(IllegalArgumentException.class, () -> MathUtils.findMax(numbers));
    }
}