refactor: use arrow functions to capture this

PR-URL: nodejs#351

lib/citgm.js

@@ -100,11 +100,10 @@ function Tester(mod, options) {
 util.inherits(Tester, EventEmitter);
 
 Tester.prototype.run = function() {
- const self = this;
  this.emit('start', this.module.raw, this.options);
 
  async.waterfall([
- init.bind(null, self),
+ init.bind(null, this),
  find.bind(null, 'node'),
  find.bind(null, 'npm'),
  tempDirectory.create,
@@ -114,45 +113,44 @@ Tester.prototype.run = function() {
  unpack,
  npm.install,
  npm.test
- ], function(err) {
- if (!self.cleanexit) {
+ ], (err) => {
+ if (!this.cleanexit) {
  const payload = {
- name: self.module.name || self.module.raw,
- version: self.module.version,
- flaky: self.module.flaky,
- expectFail: self.module.expectFail
+ name: this.module.name || this.module.raw,
+ version: this.module.version,
+ flaky: this.module.flaky,
+ expectFail: this.module.expectFail
  };
  if (err && !payload.expectFail) {
- self.emit('fail', err);
+ this.emit('fail', err);
  payload.error = err;
  } else if (!err && payload.expectFail) {
- self.emit('fail', 'this module should have failed');
+ this.emit('fail', 'this module should have failed');
  payload.error = 'this module should have failed';
  }
- if (self.testOutput !== '') {
- payload.testOutput += self.testOutput + '\n';
+ if (this.testOutput !== '') {
+ payload.testOutput += this.testOutput + '\n';
  }
- if (self.testError !== '') {
- payload.testOutput += self.testError + '\n';
+ if (this.testError !== '') {
+ payload.testOutput += this.testError + '\n';
  }
- tempDirectory.remove(self, function() {
- self.emit('end', payload);
- self.cleanexit = true;
+ tempDirectory.remove(this, () => {
+ this.emit('end', payload);
+ this.cleanexit = true;
  });
  }
  });
 };
 
 Tester.prototype.cleanup = function () {
- const self = this;
- self.cleanexit = true;
+ this.cleanexit = true;
  const payload = {
- name: self.module.name || self.module.raw,
+ name: this.module.name || this.module.raw,
  error: Error('Process Interrupted')
  };
- self.emit('fail', payload.error);
- tempDirectory.remove(self, function() {
- self.emit('end', payload);
+ this.emit('fail', payload.error);
+ tempDirectory.remove(this, () => {
+ this.emit('end', payload);
  });
 };