inspec/docs/resources/gem.md.erb
joe.nuspl 1ab80ea052 Extend gem to take an optional gem_binary
Allows one to test whether gems are installed into an omnibus environment.

Signed-off-by: Joe Nuspl <nuspl@nvwls.com>
2017-03-24 22:28:42 -07:00

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---
title: About the gem Resource
---
# gem
Use the `gem` InSpec audit resource to test if a global Gem package is installed.
## Syntax
A `gem` resource block declares a package and (optionally) a package version:
describe gem('gem_package_name', 'gem_binary') do
it { should be_installed }
end
where
* `('gem_package_name')` must specify a Gem package, such as `'rubocop'`
* `('gem_binary')` can specify the path to a non-default gem binary, defaults to `'gem'`
* `be_installed` is a valid matcher for this resource
## Matchers
This InSpec audit resource has the following matchers:
### be
<%= partial "/shared/matcher_be" %>
### be_installed
The `be_installed` matcher tests if the named Gem package is installed:
it { should be_installed }
### cmp
<%= partial "/shared/matcher_cmp" %>
### eq
<%= partial "/shared/matcher_eq" %>
### include
<%= partial "/shared/matcher_include" %>
### match
<%= partial "/shared/matcher_match" %>
### version
The `version` matcher tests if the named package version is on the system:
its('version') { should eq '0.33.0' }
## Examples
The following examples show how to use this InSpec audit resource.
### Verify that a gem package is installed, with a specific version
describe gem('rubocop') do
it { should be_installed }
its('version') { should eq '0.33.0' }
end
### Verify that a gem package is not installed
describe gem('rubocop') do
it { should_not be_installed }
end
### Verify that a gem package is installed in an omnibus environment
describe gem('pry', '/opt/ruby-2.3.1/embedded/bin/gem') do
it { should be_installed }
end
### Verify that a gem package is installed in a chef omnibus environment
describe gem('chef-sugar', :chef) do
it { should be_installed }
end
### Verify that a gem package is installed in a chef-server omnibus environment
describe gem('knife-backup', :chef_server) do
it { should be_installed }
end