alpine resource: Fix small style issues (#3238)

* Constrain RuboCop disables to single method
* Add comment to Alpine package command
* Use single quotes for Alpine package command
* Change `it` statement to be readable

Signed-off-by: Jerry Aldrich <jerryaldrichiii@gmail.com>

lib/resources/package.rb

@@ -19,10 +19,7 @@ module Inspec::Resources
         its('version') { should eq 1.9.5 }
       end
     "
-    # rubocop:disable Metrics/AbcSize
-    # rubocop:disable Metrics/CyclomaticComplexity
-    # rubocop:disable Metrics/PerceivedComplexity
-    def initialize(package_name, opts = {})
+    def initialize(package_name, opts = {}) # rubocop:disable Metrics/AbcSize, Metrics/CyclomaticComplexity, Metrics/PerceivedComplexity
       @package_name = package_name
       @name = @package_name
       @cache = nil
@@ -54,9 +51,6 @@ module Inspec::Resources
 
       evaluate_missing_requirements
     end
-    # rubocop:enable Metrics/AbcSize
-    # rubocop:enable Metrics/CyclomaticComplexity
-    # rubocop:enable Metrics/PerceivedComplexity
 
     # returns true if the package is installed
     def installed?(_provider = nil, _version = nil)

test/helper.rb

@@ -523,7 +523,8 @@ class MockLoader
       "(New-Object System.Security.Principal.SecurityIdentifier(\"S-1-5-32-544\")).Translate( [System.Security.Principal.NTAccount]).Value" => cmd.call('security-policy-sid-translated'),
       "(New-Object System.Security.Principal.SecurityIdentifier(\"S-1-5-32-555\")).Translate( [System.Security.Principal.NTAccount]).Value" => cmd.call('security-policy-sid-untranslated'),
 
-      "apk info -vv --no-network | grep git" => cmd.call('apk-info-grep-git'),
+      # alpine package commands
+      'apk info -vv --no-network | grep git' => cmd.call('apk-info-grep-git'),
     }
     @backend
   end

test/unit/resources/package_test.rb

@@ -153,7 +153,7 @@ describe 'Inspec::Resources::Package' do
   end
 
   # alpine
-  it 'verify Alpine package processing' do
+  it 'can parse Alpine packages' do
     resource = MockLoader.new(:alpine).load_resource('package', 'git')
     pkg = { name: 'git', installed: true, version: '2.15.0-r1', type: 'pkg' }
     _(resource.installed?).must_equal true