content: package com.taobao.arthas.core.util;
  
  import static org.junit.Assert.assertEquals;
  
  import org.junit.Test;
  
  public class IPUtilsTest {
      
      @Test
      public void testZeroIPv4() {
          String zero = "0.0.0.0";
          assertEquals(true, IPUtils.isAllZeroIP(zero));
      }
  
      @Test
      public void testZeroIPv6() {
          String zero = "::";
          assertEquals(true, IPUtils.isAllZeroIP(zero));
      }
  
      @Test
      public void testNormalIPv6() {
          String ipv6 = "2001:db8:85a3::8a2e:370:7334";
          assertEquals(false, IPUtils.isAllZeroIP(ipv6));
      }
  
      @Test
      public void testLeadingZerosIPv6() {
          String ipv6 = "0000::0000:0000";
          assertEquals(true, IPUtils.isAllZeroIP(ipv6));
      }
  
      @Test
      public void testTrailingZerosIPv6() {
          String ipv6 = "::0000:0000:0000";
          assertEquals(true, IPUtils.isAllZeroIP(ipv6));
      }
  
      @Test
      public void testMixedZerosIPv6() {
          String ipv6 = "0000::0000:0000:0000:0000";
          assertEquals(true, IPUtils.isAllZeroIP(ipv6));
      }
  
      @Test
      public void testEmptyIPv6() {
          String empty = "";
          assertEquals(false, IPUtils.isAllZeroIP(empty));
      }
  
      @Test
      public void testBlankIPv6() {
          String blank = " ";
          assertEquals(false, IPUtils.isAllZeroIP(blank));
      }
  }
  