```ruby
require 'buckaroo_client/configuration'

describe BuckarooClient::Configuration do
  RSpec.shared_examples 'getter/setter' do |name|
    it "defines `#{name}' getter and setter" do
      subject.public_send("#{name}=", 'bla')
      expect(subject.public_send(name)).to eq 'bla'
    end
  end

  describe '#websitekey' do
    include_examples 'getter/setter', 'websitekey'
  end

  describe '#secret' do
    include_examples 'getter/setter', 'secret'
  end

  describe '#environment' do
    include_examples 'getter/setter', 'environment'

    it 'defaults to \'test\'' do
      expect(subject.environment).to eq 'test'
    end
  end

end
```

Make sure Configuration uses ENV variables on initialize
user
```ruby
require 'buckaroo_client/configuration'

describe BuckarooClient::Configuration do
  RSpec.shared_examples 'getter/setter' do |name|
    it "defines `#{name}' getter and setter" do
      subject.public_send("#{name}=", 'bla')
      expect(subject.public_send(name)).to eq 'bla'
    end
  end

  describe '#initialize' do
    it 'defaults to ENV values if no arguments given' do
      stub_const('ENV', {
        'BUCKAROO_CLIENT_WEBSITEKEY' => 'a',
        'BUCKAROO_CLIENT_SECRET' => 'b',
        'BUCKAROO_CLIENT_ENVIRONMENT' => 'c'
      })
      c = described_class.new
      expect(c.websitekey).to eq 'a'
      expect(c.secret).to eq 'b'
      expect(c.environment).to eq 'c'
    end
  end

  describe '#websitekey' do
    include_examples 'getter/setter', 'websitekey'
  end

  describe '#secret' do
    include_examples 'getter/setter', 'secret'
  end

  describe '#environment' do
    include_examples 'getter/setter', 'environment'

    it 'defaults to \'test\'' do
      expect(subject.environment).to eq 'test'
    end
  end

end
```
assistant