$1.$ Testing using whitebox techniques $(30$ marks$)$

Read the following scenario and then answer the questions given:

A vending machine dispenses either hot or cold drinks. If you choose a hot drink $($e$.$g$.$

tea or coffee$),$ it asks if you want milk $($and adds milk if desired$),$ then it asks if you

want sugar $($and adds sugar if required$),$ and finally, your drink is dispensed.

A flow graph for this vending machine might look something like this:

$2$

a$.$ Using this flow chart, draw a control flow diagram. $($Hint: the structure will be

much the same as the above$).$

b$.$ Using the following tests, what is the statement coverage achieved for each of

the following tests and for both tests together?

Test $1$: Dispense a cold drink

Test $2$: Dispense a hot drink with milk and lots of sugar

c$.$ Using the same tests as in $($b$),$ what is the decision coverage achieved?

d$.$ What additional tests $($if any$)$ would be needed to achieve $100\%$ statement

coverage?

e$.$ What additional tests $($if any$)$ would be needed to achieve $100\%$ decision

coverage?

f$.$ How many tests are required to achieve $100\%$ path coverage? What are these tests