White Box Testing

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Built-in Assumptions• Scan the code for built-in assumptions that may be incorrect– Year begins with 19– Age is less than 100– String is non-empty– Protocol in URL is all lower-case• What about "hTtP://..." or FTP://...?
Limitations of white box testing• Whatever blind spots you had when writing the code will carry over into your white boxtesting– <strong>Testing</strong> by independent test group is also necessary• Developers often test with the intent to prove that the code works rather than provingthat it doesn't work• Developers tend to skip the more sophisticated types of white box tests (e.g., conditiontesting, data flow testing, loop testing, etc.), relying mostly on line coverage• <strong>White</strong> box testing focuses on testing the code that's there. If something is missing (e.g.,you forgot to handle a particular case), white box testing might not help you.• There are many kinds of errors that white box testing won't find– Timing and concurrency bugs– Performance problems– Usability problems– Etc.
Page 1: White Box TestingSources:Code Compl
Page 4 and 5: Complete Path Coverage• Test ALL
Page 6 and 7: Branch coverage• Similar to line
Page 8 and 9: Branch coverage• Example What tes
Page 12 and 13: Partial Condition testing• This i
Page 14 and 15: Loop Testing• Design test cases b
Page 16 and 17: Data Flow Testing• The techniques
Page 18 and 19: Data Flow TestingIf ( Condition 1 )
Page 20: Relational condition testing• Tes
Page 23: Data Type Errors• Scan the code f

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