Software Quality and Testing Tip

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Software Quality and Testing Tip 2Do you know
how to systematically perform negative testing?
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What is the Difference?

• Positive Testing is any activity aimed at
  evaluating an attribute or a capability of a
  system and determining that it meets its
  requirements. Expectation is that data inputted
  is valid and will be processed through the normal
  paths.
• Negative Testing is the process of executing a
  program or system with the intent of finding
  errors. Expectation is that data inputted is
  invalid and will be processed through the error
  handling paths.

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Systematically Developing Negative Tests
Considering the definition of a Test Case Input
Pre-conditions ? Post-conditions Output You may
develop negative tests as follows

• Based on-pre-conditions of test cases already
  designed
• Consider every item under the pre-condition of
  every test case
• Develop a different test case for the opposite
  condition
• Based on input
• Write test cases using every possible invalid
  input