gistfile1.txt

      return Client.create(config.publicUrl, 'a+b+c@example.com', pwd)
        .then(
          function (c) {
            return c.destroyAccount()
          },
          function (err) {
            t.equal(err.errno, 101, 'unusual email is not invalid')
          }
        )

// should be

      return Client.create(config.publicUrl, 'a+b+c@example.com', pwd)
        .then(
          function (c) {
            t.pass('Weird but valid email address accepted')
            return c.destroyAccount()
          },
          function (err) {
            t.fail('Email address ' + email + ' is valid, but was not accepted')
          }
        )

We don't care whether the create succeeds or not, we only care that we don't get a validation error. The top one is close to correct, but should really check that errno != 107, but since a 101 means it passed validation its not wrong. The test should not fail in the bottom one unless the errno == 107, but besides that it is ok too.