text: // Flags: --expose-internals
  'use strict';
  
  const common = require('../common');
  const assert = require('assert');
  const fs = require('fs');
  const path = require('path');
  const SyncWriteStream = require('internal/fs').SyncWriteStream;
  
  const tmpdir = require('../common/tmpdir');
  tmpdir.refresh();
  
  const filename = path.join(tmpdir.path, 'sync-write-stream.txt');
  
  // Verify constructing the instance with default options.
  {
    const stream = new SyncWriteStream(1);
  
    assert.strictEqual(stream.fd, 1);
    assert.strictEqual(stream.readable, false);
    assert.strictEqual(stream.autoClose, true);
    assert.strictEqual(stream.listenerCount('end'), 1);
  }
  
  // Verify constructing the instance with specified options.
  {
    const stream = new SyncWriteStream(1, { autoClose: false });
  
    assert.strictEqual(stream.fd, 1);
    assert.strictEqual(stream.readable, false);
    assert.strictEqual(stream.autoClose, false);
    assert.strictEqual(stream.listenerCount('end'), 1);
  }
  
  // Verify that the file will be written synchronously.
  {
    const fd = fs.openSync(filename, 'w');
    const stream = new SyncWriteStream(fd);
    const chunk = Buffer.from('foo');
  
    assert.strictEqual(stream._write(chunk, null, common.mustCall(1)), true);
    assert.strictEqual(fs.readFileSync(filename).equals(chunk), true);
  }
  
  // Verify that the stream will unset the fd after destroy().
  {
    const fd = fs.openSync(filename, 'w');
    const stream = new SyncWriteStream(fd);
  
    stream.on('close', common.mustCall(3));
  
    assert.strictEqual(stream.destroy(), true);
    assert.strictEqual(stream.fd, null);
    assert.strictEqual(stream.destroy(), true);
    assert.strictEqual(stream.destroySoon(), true);
  }
  
  // Verify that the 'end' event listener will also destroy the stream.
  {
    const fd = fs.openSync(filename, 'w');
    const stream = new SyncWriteStream(fd);
  
    assert.strictEqual(stream.fd, fd);
  
    stream.emit('end');
    assert.strictEqual(stream.fd, null);
  }
  