Make PStore tests as optional

Author: hsbt

lib/cgi/session/pstore.rb

@@ -11,7 +11,10 @@
 # cgi/session.rb for more details on session storage managers.
 
 require_relative '../session'
-require 'pstore'
+begin
+  require 'pstore'
+rescue LoadError
+end
 
 class CGI
   class Session
@@ -82,7 +85,7 @@ def delete
         File::unlink path
       end
 
-    end
+    end if defined?(::PStore)
   end
 end
 # :enddoc:

test/cgi/test_cgi_session.rb

@@ -91,7 +91,7 @@ def test_cgi_session_pstore
     assert_equal(value1,session["key1"])
     assert_equal(value2,session["key2"])
     session.close
-  end
+  end if defined?(::PStore)
   def test_cgi_session_specify_session_id
     update_env(
       'REQUEST_METHOD'  => 'GET',