test readme and test sof

test/README.md

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+# Testing
+
+Testing is off course great, and well practised in the ruby community.
+Good tests exists in the parts where functionality is clear: Parsing and binary generation.
+
+But it is difficult to write tests when you don't know what the functionality is.
+Also TDD does not really help as it assumes you know what you're doing.
+
+As this is all quite new, i tend to test only when i know that the functionality will stay that way.
+Otherwise it's just too much effort to rewrite and rewrite the tests.
+
+I used minitest / test-unit as the framewok, just because it is lighter and thus when the
+time comes to move to salama, less work.
+
+## Commands
+
+bundle exec rake test
+