```ruby
# frozen_string_literal: true

require "rails_helper"

RSpec.describe TextFilterPlugin::Macro do
  describe "#self.attributes_parse" do
    it 'parses lang="ruby" to {"lang" => "ruby"}' do
      expect(described_class.attributes_parse('<publify:code lang="ruby">')).
        to eq("lang" => "ruby")
    end

    it "parses lang='ruby' to {'lang' => 'ruby'}" do
      expect(described_class.attributes_parse("<publify:code lang='ruby'>")).
        to eq("lang" => "ruby")
    end
  end
end
```

Improve specs for list of available filters
user
```ruby
# frozen_string_literal: true

require "rails_helper"

RSpec.describe TextFilterPlugin do
  describe ".available_filters" do
    subject { described_class.available_filters }

    it { is_expected.to include(PublifyApp::Textfilter::Markdown) }
    it { is_expected.to include(PublifyApp::Textfilter::Smartypants) }
    it { is_expected.to include(PublifyApp::Textfilter::Twitterfilter) }
    it { is_expected.not_to include(TextFilterPlugin::Markup) }
    it { is_expected.not_to include(TextFilterPlugin::Macro) }
    it { is_expected.not_to include(TextFilterPlugin::MacroPre) }
    it { is_expected.not_to include(TextFilterPlugin::MacroPost) }
  end

  describe ".macro_filters" do
    subject { described_class.macro_filters }

    it { is_expected.not_to include(PublifyApp::Textfilter::Markdown) }
    it { is_expected.not_to include(PublifyApp::Textfilter::Smartypants) }
    it { is_expected.not_to include(PublifyApp::Textfilter::Twitterfilter) }
    it { is_expected.not_to include(TextFilterPlugin::Markup) }
    it { is_expected.not_to include(TextFilterPlugin::Macro) }
    it { is_expected.not_to include(TextFilterPlugin::MacroPre) }
    it { is_expected.not_to include(TextFilterPlugin::MacroPost) }
  end
end

RSpec.describe TextFilterPlugin::Macro do
  describe "#self.attributes_parse" do
    it 'parses lang="ruby" to {"lang" => "ruby"}' do
      expect(described_class.attributes_parse('<publify:code lang="ruby">')).
        to eq("lang" => "ruby")
    end

    it "parses lang='ruby' to {'lang' => 'ruby'}" do
      expect(described_class.attributes_parse("<publify:code lang='ruby'>")).
        to eq("lang" => "ruby")
    end
  end
end
```
assistant