Question

Given are the following low-level requirements:

LL10.3

IF( ((numberOfSatellites < 4) AND ( receiverFlag = TRUE))

|| ((numberOfSatellites >= 4) AND (receiverFlag = FALSE)) )

WriteErrorMessage()

ELSE

IF( timeOfWeek > 0)

ComputePosition()

ENDIF

Suppose this low-level requirement is implemented as follows:

if( ( (numberOfSatellites < 4) && (receiverFlag == TRUE) ) || (

(numberOfSatellites >= 4) && (receiverFlag == FALSE) ) )

{

WriteErrorMessage();

} else if (timeOfWeek > 0)

{ ComputePosition(); }

How many tests are required to achieve (explain your answer and give the test cases)

: a) Statement Coverage

b) Condition Coverage

c) Decision/Condition Coverage

d) Multiple Decision/Condition Coverage

e) Modified Condition/Decision Coverage  

Give examples of a set of test cases that would achieve MC/DC.

Answer 1

STATEMENT COVERAGE

We require a minimum of 2 test cases to run every statement.

1.  numberOfSatellites = 3, receiverFlag = TRUE

2. numberOfSatellites = 5, receiverFlag = TRUE, timeOfWeek = 2

CONDITION COVERAGE

Here, each condition takes all possible outcomes at least once. Hence we require a minimum of 4 test cases.

1. numberOfSatellites = 3, receiverFlag = TRUE

2. numberOfSatellites = 3, receiverFlag = FALSE , timeOfWeek = 2

3. numberOfSatellites = 5, receiverFlag = FALSE

4. numberOfSatellites = 5, receiverFlag = TRUE, timeOfWeek = 0

DECISION / CONDITION COVERAGE

We require a minimum of 6 test cases.

1. numberOfSatellites = 3, receiverFlag = TRUE

2. numberOfSatellites = 3, receiverFlag = FALSE , timeOfWeek = 2

3. numberOfSatellites = 5, receiverFlag = FALSE

4. numberOfSatellites = 5, receiverFlag = TRUE, timeOfWeek = 2

5. numberOfSatellites = 3, receiverFlag = FALSE , timeOfWeek = 0

6. numberOfSatellites = 5, receiverFlag = TRUE, timeOfWeek = 0

MULTIPLE DECISION / CONDITION COVERAGE

Same as decision /condition coverage.

MODIFIED DECISION / CONDITION COVERAGE

We require a minimum of 6 test cases.

1. numberOfSatellites = 3, receiverFlag = TRUE

2. numberOfSatellites = 3, receiverFlag = FALSE , timeOfWeek = 2

3. numberOfSatellites = 5, receiverFlag = FALSE

4. numberOfSatellites = 5, receiverFlag = TRUE, timeOfWeek = 2

5. numberOfSatellites = 3, receiverFlag = FALSE , timeOfWeek = 0

6. numberOfSatellites = 5, receiverFlag = TRUE, timeOfWeek = 0