add unit tests

test/unit/fetchers.rb

@@ -48,6 +48,9 @@ describe Inspec::Plugins::RelFetcher do
     # extract folder structure buildup
     %w{/a /a/b /a/b/c}        => %w{c},
     %w{/a /a/b /a/b/c/d/e}    => %w{e},
+    # ignore pax_global_header, which are commonly seen in github tars and are not
+    # ignored by all tar streaming tools, its not extracted by GNU tar since 1.14
+    %w{/pax_global_header /a/b}    => %w{b},
   }.each do |ins, outs|
     describe 'empty profile' do
       let(:in_files) { ins }

test/unit/fetchers/tar_test.rb

@@ -12,7 +12,7 @@ describe Fetchers::Tar do
     _(reg['tar']).must_equal fetcher
   end
 
-  describe 'applied to a zipped archive' do
+  describe 'applied to a tar archive' do
     let(:target) { MockLoader.profile_tgz('complete-profile') }
     let(:res) { fetcher.resolve(target) }