code: package com.beijunyi.parallelgit.filesystem;
  
  import java.io.IOException;
  import java.net.URI;
  import java.nio.file.FileSystemNotFoundException;
  
  import org.junit.Test;
  
  import static org.junit.Assert.assertFalse;
  
  public class GitFileSystemCloseTest extends PreSetupGitFileSystemTest {
  
    @Test
    public void closeFileSystem_fileSystemShouldBecomeClosed() throws IOException {
      gfs.close();
      assertFalse(gfs.isOpen());
    }
  
    @Test(expected = FileSystemNotFoundException.class)
    public void closeFileSystemAndGetFileSystem_shouldThrowFileSystemNotFoundException() throws IOException {
      URI uri = root.toUri();
      gfs.close();
      provider.getFileSystem(uri);
    }
  }
  