code: package com.beijunyi.parallelgit.utils;
  
  import java.io.IOException;
  
  import com.beijunyi.parallelgit.AbstractParallelGitTest;
  import com.beijunyi.parallelgit.utils.exceptions.NoSuchTagException;
  import org.eclipse.jgit.lib.AnyObjectId;
  import org.junit.Before;
  import org.junit.Test;
  
  import static org.junit.Assert.assertEquals;
  
  public class TagUtilsGetTaggedCommitTest extends AbstractParallelGitTest {
  
    @Before
    public void setUp() throws IOException {
      initRepository();
    }
  
    @Test
    public void getTaggedCommit_shouldReturnTheIdOfTheTaggedCommit() throws IOException {
      writeSomethingToCache();
      AnyObjectId commitId = commitToMaster();
      TagUtils.tagCommit("test_tag", commitId, repo);
      assertEquals(commitId, TagUtils.getTaggedCommit("test_tag", repo));
    }
  
    @Test(expected = NoSuchTagException.class)
    public void getTaggedCommitWhenTagDoesNotExist_shouldThrowNoSuchTagException() throws IOException {
      TagUtils.getTaggedCommit("non_existent_tag", repo);
    }
  
  }
  