code: package com.beijunyi.parallelgit.filesystem.io;
  
  import java.io.IOException;
  import java.nio.file.attribute.FileTime;
  import java.util.Collections;
  import javax.annotation.Nullable;
  
  import com.beijunyi.parallelgit.filesystem.AbstractGitFileSystemTest;
  import org.junit.Before;
  import org.junit.Test;
  
  import static org.eclipse.jgit.lib.Constants.encodeASCII;
  import static org.eclipse.jgit.lib.FileMode.*;
  import static org.junit.Assert.*;
  
  public class BasicFileAttributeViewTest extends AbstractGitFileSystemTest {
  
    @Before
    public void setUp() throws IOException {
      initRepository();
    }
  
    @Test
    public void getName_shouldReturnBasic() throws IOException {
      writeToCache("/file.txt");
      commitToMaster();
      initGitFileSystem();
  
      GfsFileAttributeView.Basic view = provider.getFileAttributeView(gfs.getPath("/file.txt"), GfsFileAttributeView.Basic.class);
      assertNotNull(view);
      assertEquals("basic", view.name());
    }
  
    @Test
    public void readAttributes_shouldReturnNotNull() throws IOException {
      writeToCache("/file.txt");
      commitToMaster();
      initGitFileSystem();
  
      GfsFileAttributeView.Basic view = provider.getFileAttributeView(gfs.getPath("/file.txt"), GfsFileAttributeView.Basic.class);
      assertNotNull(view);
      assertNotNull(view.readAttributes());
    }
  
    @Nullable
    public static Object readAttribute(GfsFileAttributeView view, String key) throws IOException {
      return view.readAttributes(Collections.singleton(key)).get(key);
    }
  
    @Test
    public void getSizeAttributeOfFile_shouldReturnTheFileSize() throws IOException {
      byte[] data = encodeASCII("13 bytes data");
      writeToCache("/file.txt", data);
      commitToMaster();
      initGitFileSystem();
  
      GfsFileAttributeView.Basic view = provider.getFileAttributeView(gfs.getPath("/file.txt"), GfsFileAttributeView.Basic.class);
      assertNotNull(view);
      assertEquals(13L, readAttribute(view, GfsFileAttributeView.Basic.SIZE_NAME));
    }
  
    @Test
    public void getSizeAttributeOfDirectory_shouldReturnZero() throws IOException {
      writeToCache("/dir/file.txt");
      commitToMaster();
      initGitFileSystem();
  
      GfsFileAttributeView.Basic view = provider.getFileAttributeView(gfs.getPath("/dir"), GfsFileAttributeView.Basic.class);
      assertNotNull(view);
      assertEquals(0L, readAttribute(view, GfsFileAttributeView.Basic.SIZE_NAME));
    }
  
    @Test
    public void getCreationTimeAttributeOfFile_shouldReturnEpoch() throws IOException {
      writeToCache("/file.txt");
      commitToMaster();
      initGitFileSystem();
  
      GfsFileAttributeView.Basic view = provider.getFileAttributeView(gfs.getPath("/file.txt"), GfsFileAttributeView.Basic.class);
      assertNotNull(view);
      assertEquals(FileTime.fromMillis(0), readAttribute(view, GfsFileAttributeView.Basic.CREATION_TIME_NAME));
    }
  
    @Test
    public void getLastAccessTimeAttributeOfFile_shouldReturnEpoch() throws IOException {
      writeToCache("/file.txt");
      commitToMaster();
      initGitFileSystem();
  
      GfsFileAttributeView.Basic view = provider.getFileAttributeView(gfs.getPath("/file.txt"), GfsFileAttributeView.Basic.class);
      assertNotNull(view);
      assertEquals(FileTime.fromMillis(0), readAttribute(view, GfsFileAttributeView.Basic.LAST_ACCESS_TIME_NAME));
    }
  
    @Test
    public void getLastModifiedTimeAttributeOfFile_shouldReturnEpoch() throws IOException {
      writeToCache("/file.txt");
      commitToMaster();
      initGitFileSystem();
  
      GfsFileAttributeView.Basic view = provider.getFileAttributeView(gfs.getPath("/file.txt"), GfsFileAttributeView.Basic.class);
      assertNotNull(view);
      assertEquals(FileTime.fromMillis(0), readAttribute(view, GfsFileAttributeView.Basic.LAST_MODIFIED_TIME_NAME));
    }
  
    @Test
    public void getFileKeyAttributeOfFile_shouldReturnNull() throws IOException {
      writeToCache("/file.txt");
      commitToMaster();
      initGitFileSystem();
  
      GfsFileAttributeView.Basic view = provider.getFileAttributeView(gfs.getPath("/file.txt"), GfsFileAttributeView.Basic.class);
      assertNotNull(view);
      assertNull(readAttribute(view, GfsFileAttributeView.Basic.FILE_KEY_NAME));
    }
  
    @Test
    public void getIsDirectoryAttributeOfFile_shouldReturnFalse() throws IOException {
      writeToCache("/file.txt");
      commitToMaster();
      initGitFileSystem();
  
      GfsFileAttributeView.Basic view = provider.getFileAttributeView(gfs.getPath("/file.txt"), GfsFileAttributeView.Basic.class);
      assertNotNull(view);
      assertEquals(false, readAttribute(view, GfsFileAttributeView.Basic.IS_DIRECTORY_NAME));
    }
  
    @Test
    public void getIsDirectoryAttributeOfDirectory_shouldReturnTrue() throws IOException {
      writeToCache("/dir/file.txt");
      commitToMaster();
      initGitFileSystem();
  
      GfsFileAttributeView.Basic view = provider.getFileAttributeView(gfs.getPath("/dir"), GfsFileAttributeView.Basic.class);
      assertNotNull(view);
      assertEquals(true, readAttribute(view, GfsFileAttributeView.Basic.IS_DIRECTORY_NAME));
    }
  
    @Test
    public void getIsRegularFileAttributeOfFile_shouldReturnTrue() throws IOException {
      writeToCache("/file.txt");
      commitToMaster();
      initGitFileSystem();
  
      GfsFileAttributeView.Basic view = provider.getFileAttributeView(gfs.getPath("/file.txt"), GfsFileAttributeView.Basic.class);
      assertNotNull(view);
      assertEquals(true, readAttribute(view, GfsFileAttributeView.Basic.IS_REGULAR_FILE_NAME));
    }
  
    @Test
    public void getIsRegularFileAttributeOfExecutableFile_shouldReturnTrue() throws IOException {
      writeToCache("/file.txt", someBytes(), EXECUTABLE_FILE);
      commitToMaster();
      initGitFileSystem();
  
      GfsFileAttributeView.Basic view = provider.getFileAttributeView(gfs.getPath("/file.txt"), GfsFileAttributeView.Basic.class);
      assertNotNull(view);
      assertEquals(true, readAttribute(view, GfsFileAttributeView.Basic.IS_REGULAR_FILE_NAME));
    }
  
    @Test
    public void getIsRegularFileAttributeOfDirectory_shouldReturnFalse() throws IOException {
      writeToCache("/dir/file.txt");
      commitToMaster();
      initGitFileSystem();
  
      GfsFileAttributeView.Basic view = provider.getFileAttributeView(gfs.getPath("/dir"), GfsFileAttributeView.Basic.class);
      assertNotNull(view);
      assertEquals(false, readAttribute(view, GfsFileAttributeView.Basic.IS_REGULAR_FILE_NAME));
    }
  
    @Test
    public void getIsSymbolicLinkAttributeOfFile_shouldReturnFalse() throws IOException {
      writeToCache("/file.txt");
      commitToMaster();
      initGitFileSystem();
  
      GfsFileAttributeView.Basic view = provider.getFileAttributeView(gfs.getPath("/file.txt"), GfsFileAttributeView.Basic.class);
      assertNotNull(view);
      assertEquals(false, readAttribute(view, GfsFileAttributeView.Basic.IS_SYMBOLIC_LINK_NAME));
    }
  
    @Test
    public void getIsSymbolicLinkAttributeOfSymbolicLink_shouldReturnTrue() throws IOException {
      writeToCache("/file.txt", someBytes(), SYMLINK);
      commitToMaster();
      initGitFileSystem();
  
      GfsFileAttributeView.Basic view = provider.getFileAttributeView(gfs.getPath("/file.txt"), GfsFileAttributeView.Basic.class);
      assertNotNull(view);
      assertEquals(true, readAttribute(view, GfsFileAttributeView.Basic.IS_SYMBOLIC_LINK_NAME));
    }
  
    @Test
    public void getIsOtherAttributeOfFile_shouldReturnFalse() throws IOException {
      writeToCache("/file.txt");
      commitToMaster();
      initGitFileSystem();
  
      GfsFileAttributeView.Basic view = provider.getFileAttributeView(gfs.getPath("/file.txt"), GfsFileAttributeView.Basic.class);
      assertNotNull(view);
      assertEquals(false, readAttribute(view, GfsFileAttributeView.Basic.IS_OTHER_NAME));
    }
  
    @Test(expected = UnsupportedOperationException.class)
    public void getNonBasicAttributeOfFile_shouldThrowUnsupportedOperationException() throws IOException {
      writeToCache("/file.txt");
      commitToMaster();
      initGitFileSystem();
  
      GfsFileAttributeView.Basic view = provider.getFileAttributeView(gfs.getPath("/file.txt"), GfsFileAttributeView.Basic.class);
      assertNotNull(view);
      readAttribute(view, "nonBasicAttribute");
    }
  
    @Test(expected = UnsupportedOperationException.class)
    public void setTimes_shouldThrowUnsupportedOperationException() throws IOException {
      writeToCache("/file.txt");
      commitToMaster();
      initGitFileSystem();
  
      GfsFileAttributeView.Basic view = provider.getFileAttributeView(gfs.getPath("/file.txt"), GfsFileAttributeView.Basic.class);
      assertNotNull(view);
      FileTime now = FileTime.fromMillis(System.currentTimeMillis());
      view.setTimes(now, now, now);
    }
  
  }
  