```ruby
require 'serverspec'
require 'pathname'

include Serverspec::Helper::Exec

# serverspec's FreeBSD support is craptastic. We'll just make it think
# it's executing on OS X.
if RUBY_PLATFORM =~ /freebsd/
  include Serverspec::Helper::Darwin
else
  include Serverspec::Helper::DetectOS
end

if RUBY_PLATFORM =~ /darwin/
  describe command('pkgutil --pkg-info=com.apple.pkg.CLTools_Executables') do
    it { should return_exit_status 0 }
  end
end

describe command('/usr/local/bin/ruby --version') do
  it { should return_stdout(/^ruby 2\.1\.1(.+)/) }
end

describe file('/usr/local/bin/ccache') do
  it { should be_executable }
end

%w[gcc g++ cc c++].each do |compiler|
  describe file("/usr/local/bin/#{compiler}") do
    it { should be_linked_to '/usr/local/bin/ccache' }
  end
end
```

Add more ServerSpec tests for git, bash, and ccache
user
```ruby
require 'serverspec'
require 'pathname'

include Serverspec::Helper::Exec

# serverspec's FreeBSD support is craptastic. We'll just make it think
# it's executing on OS X.
if RUBY_PLATFORM =~ /freebsd/
  include Serverspec::Helper::Darwin
else
  include Serverspec::Helper::DetectOS
end

if RUBY_PLATFORM =~ /darwin/
  describe command('pkgutil --pkg-info=com.apple.pkg.CLTools_Executables') do
    it { should return_exit_status 0 }
  end
end

context 'ccache' do
  describe file('/usr/local/bin/ccache') do
    it { should be_executable }
  end

  describe command('/usr/local/bin/ccache --version') do
    it { should return_stdout(/3\.1\.9/) }
  end

  %w[gcc g++ cc c++].each do |compiler|
    describe file("/usr/local/bin/#{compiler}") do
      it { should be_linked_to '/usr/local/bin/ccache' }
    end
  end
end

context 'ruby' do
  describe command('which ruby') do
    it { should return_stdout('/bin/ruby') }
  end

  describe command('/usr/local/bin/ruby --version') do
    it { should return_stdout(/^ruby 2\.1\.1(.+)/) }
  end
end

context 'bash' do
  describe command('which bash') do
    it { should return_stdout('/bin/bash') }
  end

  describe command('/usr/local/bin/bash --version') do
    it { should return_stdout(/4\.3/) }
  end
end

context 'git' do
  describe command('which git') do
    it { should return_stdout('/bin/git') }
  end

  describe command('/usr/local/bin/git --version') do
    it { should return_stdout(/1\.9\.0/) }
  end
end
```
assistant