unit testing - Disadvantages of Test Driven Development? -

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what lose adopting test driven design?

list negatives; not list benefits written in negative form.

several downsides (and i'm not claiming there no benefits - when writing foundation of project - it'd save lot of time @ end):

  • big time investment. simple case lose 20% of actual implementation, complicated cases lose more.
  • additional complexity. complex cases test cases harder calculate, i'd suggest in cases try , use automatic reference code run in parallel in debug version / test run, instead of unit test of simplest cases.
  • design impacts. design not clear @ start , evolves go along - force redo test generate big time lose. suggest postponing unit tests in case until have grasp of design in mind.
  • continuous tweaking. data structures , black box algorithms unit tests perfect, algorithms tend changed, tweaked or fine tuned, can cause big time investment 1 might claim not justified. use when think fits system , don't force design fit tdd.

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