Condition Decision Coverage criteria(CDC) for software testing

Example of Condition Decision Coverage  with 1 condition

Condition Decision coverage
Condition Decision coverage

Test Case ID a > 7 Decision Outcome
1 True Don’t care
2 False Don’t care
5 Don’t care True
6 Don’t care False
Condition Decision Coverage criteria(CDC)
Condition Decision Coverage criteria(CDC)

Example of Condition Decision Coverage  with 2 conditions

Test Case ID a > 7 b> 40 Decision Outcome
1 True Don’t care Don’t care
2 False Don’t care Don’t care
3 Don’t care True Don’t care
4 Don’t care False Don’t care
5 Don’t care Don’t care True
6 Don’t care Don’t care False

Example of Condition Decision Coverage  with 3 conditions

Test Case ID a > 7 b> 40 C==0 Decision Outcome
1 True Don’t care Don’t care Don’t care
2 False Don’t care Don’t care Don’t care
3 Don’t care True Don’t care Don’t care
4 Don’t care False Don’t care Don’t care
5 Don’t care Don’t care True Don’t care
6 Don’t care Don’t care False Don’t care
7 Don’t care Don’t care Don’t care True
8 Don’t care Don’t care Don’t care False

 

More examples

Test Requirements

a > 4 b >= 7 Decision Outcome
True Don’t care Don’t care
False Don’t care Don’t care
Don’t care True Don’t care
Don’t care False Don’t care
Don’t care Don’t care True
Don’t care Don’t care False

 

Test Cases

Condition Coverage Condition Coverage Decision Coverage
a > 4 b >= 7 If(a > 4 && b >= 7)
a=9 Don’t care Don’t care
a=2 Don’t care Don’t care
Don’t care b=10 Don’t care
Don’t care b=3 Don’t care
Don’t care Don’t care a=9, b=10, True
Don’t care Don’t care a=2, b=3, False

 

How many test cases are required for Condition/Decision Coverage

 

Total number of test cases = Total conditions * 2 +  Total Decisions * 2

Explanation of formula:

  • Condition 1: a > 4  (*2 because it has only two values, True and False)
  • Condition 2: b >= 7 (*2 because it has only two values, True and False)
  • Decision 1:  If(a > 4 && b >= 7) (*2 because it has only two values, True and False.

Important Points of Condition Decision Coverage (CDC)

  1. Condition Decision Coverage (CDC) subsumes Condition Coverage and Decision Coverage. It means that if we performed CDC testing, then no need to perform Condition Coverage and Decision Coverage.
  2. CDC is more strong than condition coverage.
  3. CDC is more strong than decision coverage.
  4. CDC ensures that all conditions and decisions are working fine or not.
  5. CDC is weaker than MCDC.
  6. CDC is weaker than MCC.

 

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