code: package com.beijunyi.parallelgit.filesystem;
  
  import java.io.IOException;
  import java.nio.file.*;
  
  import org.junit.Test;
  
  import static org.junit.Assert.*;
  
  public class FilesMoveTest extends AbstractGitFileSystemTest {
  
    @Test
    public void moveFile_theTargetFileShouldExist() throws IOException {
      initRepository();
      writeToCache("/source.txt");
      commitToMaster();
      initGitFileSystem();
  
      GitPath source = gfs.getPath("/source.txt");
      GitPath target = gfs.getPath("/target.txt");
      Files.move(source, target);
      assertTrue(Files.exists(target));
    }
  
    @Test
    public void moveFile_theSourceFileShouldNotExist() throws IOException {
      initRepository();
      writeToCache("/source.txt");
      commitToMaster();
      initGitFileSystem();
  
      GitPath source = gfs.getPath("/source.txt");
      GitPath target = gfs.getPath("/target.txt");
      Files.move(source, target);
      assertFalse(Files.exists(source));
    }
  
    @Test
    public void moveFile_theTargetFileShouldHaveTheSameData() throws IOException {
      initRepository();
      byte[] expectedData = someBytes();
      writeToCache("/source.txt", expectedData);
      commitToMaster();
      initGitFileSystem();
  
      GitPath source = gfs.getPath("/source.txt");
      GitPath target = gfs.getPath("/target.txt");
      Files.move(source, target);
      assertArrayEquals(expectedData, Files.readAllBytes(target));
    }
  
    @Test(expected = FileAlreadyExistsException.class)
    public void moveFileWhenTargetExists_shouldThrowFileAlreadyExistsException() throws IOException {
      initRepository();
      writeToCache("/source.txt");
      writeToCache("/target.txt");
      commitToMaster();
      initGitFileSystem();
  
      GitPath source = gfs.getPath("/source.txt");
      GitPath target = gfs.getPath("/target.txt");
      Files.move(source, target);
    }
  
    @Test
    public void moveFileWhenTargetExists_theSourceFileShouldExistAfterTheException() throws IOException {
      initRepository();
      writeToCache("/source.txt");
      writeToCache("/target.txt");
      commitToMaster();
      initGitFileSystem();
  
      GitPath source = gfs.getPath("/source.txt");
      GitPath target = gfs.getPath("/target.txt");
      try {
        Files.move(source, target);
      } catch(FileAlreadyExistsException ignore) {
      }
      assertTrue(Files.exists(source));
    }
  
    @Test
    public void moveFileWithReplaceExistingOption_shouldOverwriteTheTargetFileData() throws IOException {
      initRepository();
      byte[] expectedData = someBytes();
      writeToCache("/source.txt", expectedData);
      writeToCache("/target.txt");
      commitToMaster();
      initGitFileSystem();
  
      GitPath source = gfs.getPath("/source.txt");
      GitPath target = gfs.getPath("/target.txt");
      Files.move(source, target, StandardCopyOption.REPLACE_EXISTING);
      assertArrayEquals(expectedData, Files.readAllBytes(target));
    }
  
    @Test
    public void moveFileWhenTargetEqualsSource_shouldHaveNoEffect() throws IOException {
      initRepository();
      byte[] expectedData = someBytes();
      writeToCache("/source.txt", expectedData);
      commitToMaster();
      initGitFileSystem();
  
      GitPath source = gfs.getPath("/source.txt");
      Files.move(source, source);
      assertArrayEquals(expectedData, Files.readAllBytes(source));
    }
  
    @Test(expected = NoSuchFileException.class)
    public void moveNonExistentFile_shouldThrowNoSuchFileException() throws IOException {
      initGitFileSystem();
      GitPath source = gfs.getPath("/non_existent_file.txt");
      GitPath target = gfs.getPath("/target.txt");
      Files.move(source, target);
    }
  
    @Test(expected = FileAlreadyExistsException.class)
    public void moveFileWhenTargetIsDirectory_shouldThrowFileAlreadyExistsException() throws IOException {
      initRepository();
      writeToCache("/source.txt");
      writeToCache("/target/file.txt");
      commitToMaster();
      initGitFileSystem();
  
      GitPath source = gfs.getPath("/source.txt");
      GitPath target = gfs.getPath("/target");
      Files.move(source, target);
    }
  
    @Test
    public void moveFileReplacingTargetDirectory_theTargetShouldBecomeFile() throws IOException {
      initRepository();
      writeToCache("/source.txt");
      writeToCache("/target/file.txt");
      commitToMaster();
      initGitFileSystem();
  
      GitPath source = gfs.getPath("/source.txt");
      GitPath target = gfs.getPath("/target");
      Files.move(source, target, StandardCopyOption.REPLACE_EXISTING);
      assertTrue(Files.isRegularFile(target));
    }
  
    @Test
    public void moveFileReplacingTargetDirectory_theTargetFileShouldHaveTheSameData() throws IOException {
      initRepository();
      byte[] expectedData = someBytes();
      writeToCache("/source.txt", expectedData);
      writeToCache("/target/file.txt");
      commitToMaster();
      initGitFileSystem();
  
      GitPath source = gfs.getPath("/source.txt");
      GitPath target = gfs.getPath("/target");
      Files.move(source, target, StandardCopyOption.REPLACE_EXISTING);
      assertArrayEquals(expectedData, Files.readAllBytes(target));
    }
  
    @Test
    public void moveDirectory_theTargetDirectoryShouldExist() throws IOException {
      initRepository();
      writeToCache("/source/file.txt");
      commitToMaster();
      initGitFileSystem();
  
      GitPath source = gfs.getPath("/source");
      GitPath target = gfs.getPath("/target");
      Files.move(source, target);
      assertTrue(Files.exists(target));
    }
  
    @Test
    public void moveDirectory_theSourceDirectoryShouldNotExist() throws IOException {
      initRepository();
      writeToCache("/source/file.txt");
      commitToMaster();
      initGitFileSystem();
  
      GitPath source = gfs.getPath("/source");
      GitPath target = gfs.getPath("/target");
      Files.move(source, target);
      assertFalse(Files.exists(source));
    }
  
    @Test
    public void moveDirectory_theTargetDirectoryShouldBeDirectory() throws IOException {
      initRepository();
      writeToCache("/source/file.txt");
      commitToMaster();
      initGitFileSystem();
  
      GitPath source = gfs.getPath("/source");
      GitPath target = gfs.getPath("/target");
      Files.move(source, target);
      assertTrue(Files.isDirectory(target));
    }
  
    @Test
    public void moveDirectory_theTargetDirectoryShouldHaveTheSameChildren() throws IOException {
      initRepository();
      writeToCache("/source/file1.txt");
      writeToCache("/source/file2.txt");
      commitToMaster();
      initGitFileSystem();
  
      GitPath source = gfs.getPath("/source");
      GitPath target = gfs.getPath("/target");
      Files.move(source, target);
      assertTrue(Files.exists(target.resolve("file1.txt")));
      assertTrue(Files.exists(target.resolve("file2.txt")));
    }
  
    @Test
    public void moveDirectory_theChildrenInTheTargetDirectoryShouldHaveTheSameData() throws IOException {
      initRepository();
      byte[] expectedData1 = someBytes();
      writeToCache("/source/file1.txt", expectedData1);
      byte[] expectedData2 = someBytes();
      writeToCache("/source/file2.txt", expectedData2);
      commitToMaster();
      initGitFileSystem();
  
      GitPath source = gfs.getPath("/source");
      GitPath target = gfs.getPath("/target");
      Files.move(source, target);
      assertArrayEquals(expectedData1, Files.readAllBytes(target.resolve("file1.txt")));
      assertArrayEquals(expectedData2, Files.readAllBytes(target.resolve("file2.txt")));
    }
  
  }
  