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PATH TESTING

PATH TESTING. An Example for White-Box Testing. Path testing. a form of white box testing steps to complete: derive the module’s flow diagram describe all possible paths through the diagram (conditions, loops) derive path predicates derive test-cases & results per path. PROGRAM example_1

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PATH TESTING

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  1. PATH TESTING An Example for White-Box Testing

  2. Path testing • a form of white box testing • steps to complete: • derive the module’s flow diagram • describe all possible paths through the diagram (conditions, loops) • derive path predicates • derive test-cases & results per path

  3. PROGRAM example_1 VAR x , y : NUMBER BEGIN <program> READ ( x , y ); IF ( x > 20) THEN BEGIN <nested if> WRITE abs ( x - y ); IF ( x < y ) THEN WRITE ( “ x smaller y ”) ELSE WRITE ( “ x greater or equal y ” ) END <nested if> ELSE WRITE ( “ x smaller or equal 20 ” ) END <program>

  4. x > 20 x < y The Flow Diagram READ x and y TRUE FALSE “abs ( x - y )” “x smaller or equal 20” TRUE FALSE “x smaller y” “x greater or equal y”

  5. x < y Path 1 READ x and y TRUE FALSE x > 20 “abs ( x - y )” “x smaller or equal 20” TRUE FALSE “x smaller y” “x greater or equal y”

  6. Path 2: READ x and y TRUE FALSE x > 20 “abs ( x - y )” “x smaller or equal 20” TRUE FALSE x < y “x smaller y” “x greater or equal y”

  7. Path 3: READ x and y TRUE FALSE x > 20 “abs ( x - y )” “x smaller or equal 20” TRUE FALSE x < y “x smaller y” “x greater or equal y”

  8. Path 1 • predicate: X < 20 Y no constraints • test-cases: (1) X : 20 Y : 33 (2) X : 4 Y : 1 ... • results: (1) “x smaller or equal 20” • (2) “x smaller or equal 20” • ...

  9. Path 2 • predicate: X > 20 X < Y • test-cases: (1) X : 21 Y : 22 (2) X : 103 Y : 203 ... • results: (1) 1 ; “ x smaller y ” • (2) 100 ; “ x smaller y ” • ...

  10. Path 3 • predicate: X > 20 X > Y • test-cases: (1) X : 21 Y : 21 (2) X : 103 Y : 102 ... • results: (1) 0 ; “ x greater or equal y ” • (2) 1 ; “ x greater or equal y ” • ...

  11. PROGRAM example_2 VAR x , y : NUMBER BEGIN <program> READ ( x , y ); IF ( x > 20) THEN WRITE abs ( x - y ) ELSE WRITE ( “ x smaller or equal 20 “ ); IF ( x < y ) THEN WRITE ( “ x smaller y ”) ELSE WRITE ( “ x greater or equal y “) END <program>

  12. End of Section 4f

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