```ruby
require 'spec_helper'

describe BabySqueel do
  describe '.[]' do
    it 'accepts a model' do
      expect(BabySqueel[Post]).to be_a(BabySqueel::Relation)
    end

    it 'accepts an Arel::Table' do
      expect(BabySqueel[Post.arel_table]).to be_a(BabySqueel::Table)
    end

    it 'accepts a symbol' do
      expect(BabySqueel[:posts]).to be_a(BabySqueel::Table)
    end
  end
end
```

Add a unit spec for BabySqueel.configure
user
```ruby
require 'spec_helper'

describe BabySqueel do
  describe '.configure' do
    it 'yields itself for mutation' do
      BabySqueel.configure do |config|
        expect(config).to eq(BabySqueel)
      end
    end
  end

  describe '.[]' do
    it 'accepts a model' do
      expect(BabySqueel[Post]).to be_a(BabySqueel::Relation)
    end

    it 'accepts an Arel::Table' do
      expect(BabySqueel[Post.arel_table]).to be_a(BabySqueel::Table)
    end

    it 'accepts a symbol' do
      expect(BabySqueel[:posts]).to be_a(BabySqueel::Table)
    end
  end
end
```
assistant