Add test to ensure `Zap` does not have an `uninstall_phase`.
user
```ruby
require "spec_helper"

describe Hbc::Artifact::Zap do
  let(:cask) { Hbc::CaskLoader.load_from_file(TEST_FIXTURE_DIR/"cask/Casks/with-installable.rb") }

  let(:zap_artifact) {
    Hbc::Artifact::Zap.new(cask)
  }

  before do
    shutup do
      InstallHelper.install_without_artifacts(cask)
    end
  end

  describe "#uninstall_phase" do
    subject { zap_artifact }

    it { is_expected.not_to respond_to(:uninstall_phase) }
  end
end
```
assistant