public static int max(int a, int b, int c) {
        return Math.max(Math.max(a, b), c);
    }
@Test
    public void testMax_3args() {
        System.out.println("max");
        int a = -1;
        int b = 0;
        int c = 1;
        int expResult = 1;
        int result = MathEx.max(a, b, c);
        assertEquals(expResult, result);
    }