First thing always to check with test errors and fixtures is that you haven't accidentally introduced tabs into the fixture yml file. In YAML spaces have different meanings to tabs. This is why YAML is evil (IMO). Make sure your editor isn't replacing double spaces with tabs (many YAML unaware editors will 'help' in this way and thereby cause unusual errors.
It might be worth posting your fixture and test code. Use Code tags (# symbol on message tool bar) around the code so that it is easy to read and doesn't get reformated.
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