```ruby
# -*- coding: utf-8 -*-
# Copyright 2014 TIS Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
describe Candidate do
  before do
    @system = FactoryGirl.create(:system)
  end

  describe '.active' do
    it 'return cloud that has active flag' do
      active_cloud = @system.available_clouds.last
      active_cloud.active = true
      active_cloud.save!

      @system.save!
    end
  end
end
```

Rename to candidates from available_clouds in specs
user
```ruby
# -*- coding: utf-8 -*-
# Copyright 2014 TIS Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
describe Candidate do
  before do
    @system = FactoryGirl.create(:system)
  end

  describe '.active' do
    it 'return cloud that has active flag' do
      active_cloud = @system.candidates.last
      active_cloud.active = true
      active_cloud.save!

      @system.save!
    end
  end
end
```
assistant