TEST CASE DESIGN PART FIVE

Boundary Value Analysis.

It is observed that boundary points for any inputs are not tested properly. This leads to many errors. Large number of errors tend to occur at boundaries of the input domain.

Boundary Value Analysis(BVA) leads to selection of test cases that exercise boundary values.

BVA complements equivalence partitioning i.e. select any element in an equivalence class, select those at the ''edge' of the class.

Examples:

  1. For a range of values bounded by a and b, test (a-1), a, (a+1), (b-1), b, (b+1).

  2. If input conditions specify a number of values n, test with (n-1), n and (n+1) input values.

  3. Apply 1 and 2 to output conditions (e.g., generate table of minimum and maximum size).

  4. If internal program data structures have boundaries (e.g., buffer size, table limits), use input data to exercise structures on boundaries.

BVA and Equivalence partitioning both helps in testing the programs and covers most of the conditions. This method does not test the combinations of input conditions.

Cause Effect Graphing Techniques.

Translation of natural language descriptions of procedures to software based algorithms is error prone.

Cause-effect graphing attempts to provide a concise representation of logical combinations and corresponding actions.

  1. Causes (input conditions) and effects (actions) are listed for a module and an identifier is assigned to each.

  2. A cause-effect graph developed.

  3. Graph converted to a decision table.

  4. Decision table rules are converted to test cases.

RELATED POST


INTEGRATION TESTING PART ONE

INTEGRATION TESTING PART TWO

INTEGRATION TESTING PART THREE

INTEGRATION TESTING PART FOUR

INTEGRATION TESTING PART FIVE

INTEGRATION TEST STANDARDS

INTEGRATION TEST STANDARDS PART TWO

QUALITY TESTING

QUALITY ASSURANCE

QUALITY ASSURANCE PART TWO

QUALITY ASSURANCE SQA

QUALITY OF DESIGN OF TEST CASE

QUALITY MANAGEMENT IN SOFTWARE TESTING

TOOLS FOR QUALITY MANAGEMENT

STATICAL QUALITY ASSURANCE

ISO APPROACH TO QUALITY TESTING

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