Function createTree

test.js:20–34

(callback)

  });

  function createTree(callback) {
    fs.mkdir('tmp/tree/', function () {
      fs.mkdir('tmp/tree/leaf', function () {
        fs.mkdir('tmp/tree/leaf/node', function () {
          fs.writeFile('tmp/tree/leaf/node/leaf.js', 'console.log("leaf")', function () {
            fs.mkdir('tmp/tree/leftleaf', function () {
              fs.writeFile('tmp/tree/leftleaf/leaf1.js', 'console.log("leaf")', function () {
                callback();
              });
            });
          });
        });
      });
    });
  }

  it('removes a file', function (done) {
    var stream = clean();