```ruby
require 'spec_helper'

describe Spree::ShippingCategory, :type => :model do

  describe '#validations' do
    it 'should have a valid factory' do
      expect(shipping_category).to be_valid
    end

    it 'should require name' do
      expect(FactoryGirl.build(:shipping_category, name: '')).not_to be_valid
    end

    it 'should validate uniqueness' do
      FactoryGirl.create(:shipping_category, name: 'Test')
      expect(FactoryGirl.build(:shipping_category, name: 'Test')).not_to be_valid
    end
  end
end
```

Fix specs for shipping category
user
```ruby
require 'spec_helper'

describe Spree::ShippingCategory, :type => :model do

  describe '#validations' do
    it 'should have a valid factory' do
      expect(FactoryGirl.build(:shipping_category)).to be_valid
    end

    it 'should require name' do
      expect(FactoryGirl.build(:shipping_category, name: '')).not_to be_valid
    end

    it 'should validate uniqueness' do
      FactoryGirl.create(:shipping_category, name: 'Test')
      expect(FactoryGirl.build(:shipping_category, name: 'Test')).not_to be_valid
    end
  end
end
```
assistant