code: package com.beijunyi.parallelgit.utils;
  
  import java.io.IOException;
  
  import com.beijunyi.parallelgit.AbstractParallelGitTest;
  import org.junit.Before;
  import org.junit.Test;
  
  import static org.junit.Assert.*;
  
  public class TagUtilsTagExistsTest extends AbstractParallelGitTest {
  
    @Before
    public void setUp() throws IOException {
      initRepository();
    }
  
    @Test
    public void testTagExistsWhenTagExists_shouldReturnTrue() throws IOException {
      writeSomethingToCache();
      TagUtils.tagCommit("test_tag", commitToMaster(), repo);
      assertTrue(TagUtils.tagExists("test_tag", repo));
    }
  
    @Test
    public void testTagExistsWhenTagDoesNotExist_shouldReturnFalse() throws IOException {
      assertFalse(TagUtils.tagExists("non_existent_tag", repo));
    }
  
    @Test
    public void testTagExistsWhenBranchWithSameNameExists_shouldReturnFalse() throws IOException {
      writeSomethingToCache();
      commitToBranch("test");
      assertFalse(TagUtils.tagExists("test", repo));
    }
  
  
  }
  