```ruby
#
# Cookbook Name:: universe_ubuntu
# Spec:: default
#
# Copyright (c) 2016 The Authors, All Rights Reserved.

require 'spec_helper'

describe 'universe_ubuntu::default' do
  context 'When all attributes are default, on an unspecified platform' do
    let(:chef_run) do
      runner = ChefSpec::ServerRunner.new
      runner.converge(described_recipe)
    end

    it 'converges successfully' do
      expect { chef_run }.to_not raise_error
    end
  end
end
```

Fix unit test converge error
user
```ruby
#
# Cookbook Name:: universe_ubuntu
# Spec:: default
#
# Copyright (c) 2016 The Authors, All Rights Reserved.

require 'spec_helper'

describe 'universe_ubuntu::default' do
  context 'When all attributes are default, on an Ubuntu' do
    before do
      stub_command("[ -x /home/vagrant/anaconda3/bin/conda ]").and_return(0)
    end

    let(:chef_run) do
      ChefSpec::ServerRunner.new(platform: 'ubuntu', version: '14.04') do |node|
        node.override['etc']['passwd']['vagrant']['dir'] = '/home/vagrant'
      end.converge(described_recipe)
    end

    it 'converges successfully' do
      expect { chef_run }.to_not raise_error
    end
  end
end
```
assistant