```ruby
# encoding: UTF-8

require 'rails_helper'

describe MemeCaptainWeb::Config do

  context 'when the MC_SET_FRONT_PAGE_MIN_QUALITY env var is not set' do

    it 'uses the default' do
      expect(MemeCaptainWeb::Config::SetFrontPageMinQuality).to eq 0
    end

  end

  context 'when the MC_SET_FRONT_PAGE_MIN_QUALITY env var is set' do

    xit 'uses the environment variable'

  end

end
```

Add test for SetFrontPageMinQuality config.
user
```ruby
# encoding: UTF-8

require 'rails_helper'

describe MemeCaptainWeb::Config do

  let(:rb_path) do
    File.expand_path('../../../config/initializers/config.rb', __FILE__)
  end

  after(:all) do
    # Avoid polluting config module for later tests.
    rb_path = File.expand_path(
      '../../../config/initializers/config.rb', __FILE__)
    Kernel.silence_warnings { load(rb_path) }
  end

  context 'when the MC_SET_FRONT_PAGE_MIN_QUALITY env var is not set' do
    it 'uses the default' do
      Kernel.silence_warnings { load(rb_path) }
      expect(MemeCaptainWeb::Config::SetFrontPageMinQuality).to eq 0
    end
  end

  context 'when the MC_SET_FRONT_PAGE_MIN_QUALITY env var is set' do
    before do
      stub_const(
        'ENV',
        ENV.to_hash.merge('MC_SET_FRONT_PAGE_MIN_QUALITY' => '50'))
    end

    it 'uses the environment variable' do
      Kernel.silence_warnings { load(rb_path) }
      expect(MemeCaptainWeb::Config::SetFrontPageMinQuality).to eq(50)
    end
  end
end
```
assistant