Including test.

test/io_adapters/stringio_adapter_test.rb

@@ -34,6 +34,11 @@ class StringioFileProxyTest < Test::Unit::TestCase
       assert_equal Digest::MD5.hexdigest(@contents), @subject.fingerprint
       assert_equal Digest::MD5.hexdigest(@contents), @subject.fingerprint
     end
     end
 
 
+    should "generate same fingerprint" do
+      assert_equal @subject.fingerprint, @subject.fingerprint
+    end
+
+
     should "return the data contained in the StringIO" do
     should "return the data contained in the StringIO" do
       assert_equal "abc123", @subject.read
       assert_equal "abc123", @subject.read
     end
     end