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I am trying to become more familiar with test driven approaches. One drawback for me is that a major part of my code is generated context for reporting (PDF documents, chart images). There is always a complex designer involved and there is no easy test of correctness. No chance to test just fragments!
Do you know TDD practices for this situation?
You could use Acceptance Test driven Development to replace the unit-tests and have validated reports for well known data used as references.
However this kind of test does not give a fine grained diagnostic as unit-tests do, they usually only provide a PASS/FAIL result, and, should the reports change often, the references need to be regenerated and re-validated as well.