# White Box – MCDC Testing

## White Box – MCDC Testing

MCDC enhances the condition/decision coverage criteria.

According to MCDC  each condition independently affects the outcome of the decision.

For example, this example contains three conditions

 if(a<10     &&     b<20    OR   c<30){ }

Condition C1: a<10

Condition C2: b<20

Condition C3: c<30

According to MCDC in this example,

• Firstly, we will see that overall decision(T or F) depends on Condition C1.
• If C1 is T, then a decision will be T
• If C1 is F, then a decision will be F.
• Secondly, we will see that overall decision(T or F) depends on Condition C2.
• If C2 is T, then the decision will be T
• If C2 is F, then the decision will be F.
• Thirdly, we will see that overall decision(T or F) depends on Condition C3.
• If C1 is T, then the decision will be T
• If C1 is F, then the decision will be F.

Test Requirements:

No of test requirements = No of conditions * 2

Note: Here 2 representing T and F.

If 1 condition:

No of test requirements = No of conditions * 2.

2 =1*2

If 2 conditions:

No of test requirements = No of conditions * 2

4 =2*2

If 3 conditions:

No of test requirements = No of conditions * 2

6 =3*2

Test cases:

Decision depends on Condition  C1.

 a b C C1 C2 C3 Descision Test Case# 5 10 40 T T F T 1 15 10 40 F T F F 2

Decision depends on condition C2.

 a b C C1 C2 C3 Descision Test Case# 5 10 40 T T F T 3 5 40 50 T F F F 4

Decision depends on condition C3.

 a b C C1 C2 C3 Descision Test Case# 15 40 10 F F T T 5 15 40 50 F F F F 6

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 Prof. Fazal Rehman Shamil Researcher, Publisher of International Journal Of Software Technology & Science ISSN: 2616-5325 Instructor, SEO Expert, Web Programmer and poet. Feel free to contact.