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Unit 4: White Box Testing

6: PRINT “The time:”;Time$
7: END
The above program can be run on a single test case with the date set to December 25, 2008. This
program will execute all the statements. Although we have tested each statement, the branches
were not tested. Thus, code coverage analyzers will account for code branches and report both
the branch coverage and statement coverage. It also provides details about test effectiveness.
3. Condition Coverage: Condition coverage is a complicated path testing. This is done by adding an
extra condition to the IF statement. Condition coverage is a combination of branch coverage and
more detailed conditions. Branches alter the flow of sequence in a program and jump from one
part of the program to another. Both conditional and unconditional transfers can occur. In this
type of coverage, every branch of the control flow graph (A control flow graph is a graphical
representation of all the paths which the program has traversed through during execution) is
executed at least once and the values of the conditions are also exercised at least once. The
simplest condition criterion called the basic or elementary condition coverage requires each
elementary condition to be covered, which implies that each elementary condition should have
both True and False outcomes at least once during the execution of test set.

Number of executed conditions
Basic Condition Coverage =
Total Number of conditions

Multiple conditions in the ‘if statement ‘can create more paths through the
code.

1: PRINT "Good Morning"
2: IF Date$ = "25-12-2008" AND Time$ = "00:00:00" THEN
3: PRINT "MERRY CHRISTMAS"
4: END IF
5: PRINT "The date is: "; Date$
6: PRINT "The time is: "; Time$
7: END

In line 2 in the above program, both date and time are checked. Thus, condition coverage takes the extra
conditions. We will require four test sets of test cases which assure that the each IF statement is covered.
Test cases for a Full Condition Coverage
Date$ Time$ Line # Execution
25-12-200711:11:11 1, 2, 5, 6, 7
25-12-2007 00:00:00 1, 2,5,6,7
25-12-2008 11:11:11 1, 2,5,6,7
25-12-200800:00:00 1,2,3,4,5,6,7
All the four cases are considered to be important, since they traverse through different conditions of the
IF statement such as False-False, False-True, True-False, and True-True.

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