[ cobertura-Bugs-2957940 ] The bug of the percentage branches covered for each class?

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Bugs item #2957940, was opened at 2010-02-24 04:31
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Category: None
Group: None
Status: Closed
Resolution: Rejected
Priority: 5
Private: No
Submitted By: Nobody/Anonymous (nobody)
Assigned to: John Lewis (lewijw)
Summary: The bug of the percentage branches covered for each class?

Initial Comment:
Example
Pattern 1 
	if (a || b)		→　ＯＫ
=============================
A.　branch covered (2/2)
	1. a = true  b= true 
	2. a = false  b = false
=============================
Pattern 2
	if (a && b)		→　NG?
The expected pattern is
=============================
A.　branch covered (2/2)
	1. a = true  b= true 
	2. a = false  b = false
=============================
But
=============================
A.　branch covered (2/4)
	1. a = true  b= true 
	2. a = false  b = false

	3. a = true  b= false 
	4. a = false  b = true
=============================
Isn't the pattern of 3 and 4 covering of the condition?

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Comment By: https://www.google.com/accounts ()
Date: 2013-01-07 05:03

Message:
No, in fact there are 3 branches to cover 

a && b

condition

a = true b = false
a = true b = true
a = false

Typicall usage is for example

String s = ...
if ( b != null && new Boolean(d) )  {
    ...
}

It's not possible to cover all 4 branches.

It's similar to || condition.

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Comment By: John Lewis (lewijw)
Date: 2010-02-24 13:45

Message:
There are two conditions in the if statement:  is "a" true and is "b" true?
   To cover the first one, tests have to set "a" to true and "a" to false. 
 To cover the second condition, tests have to set "b" to true and "b" to
false (of course "a" will need to be true in both cases).

So, there are 4 permutations that have to be covered.

Please clarify if I have not understood your question.

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