单元测试Math.min（）

Question

我不明白以下单元测试（来自我的教科书）如何充分测试Java的Math.min()方法：

import java.util.Random;

/**
   This app tests the method min of the class Math.
*/
public class MathTester
{
    public static void main (String[] args) 
    {
        final int VECTOR_SIZE = 100;

        Random random = new Random();
        boolean pass = true;

        for (int i = 0; i < VECTOR_SIZE && pass; i++)
        {
            int a = random.nextInt();
            int b = random.nextInt();
            double min = Math.min(a, b);
            if (a < min || b < min && (a != min && b != min))
            {
                System.out.print("The method failed the test case: ");
                System.out.println("a = " + a + ", b = " + b);
                pass = false;
            }
        }
        if (pass)
        {
            System.out.println("The method passed all test cases");
        }
    }
}

假设a == 5，b == 3和min == 2。这应该会导致失败，因为Math.min()应该返回其较小的参数（并且2不是参数）。然而在我看来，测试会（错误地）传递这种情况，因为a和b都大于2，因此包含失败代码的if块将不会执行