From Test::Simple to Test::Extreme - Think Like A Bug 42

Some Specific Things to Test

  • Perl saves us from a lot of general programming boundary conditions, especially by not crashing on bad data

  • But sometimes Perl's DWIM leads to bugs

    • What about automatic conversion between strings and numbers?

    • Hash key autovification?

    • The string "0" being false?

    • DBI NULL vs. Perl undef

    • DBI $rows = '0E0'

    • Comparison tests for the wrong kind of data (e.g. == vs. eq)?

    • = instead of ==

    • automatic conversion of line endings \n on input

    • SQL injection

    • what else?

  • keep a library of testing strategies

 
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