Aptitude Knowledge Question:

A hotel telephone system can perform 3 functions:
• Call another hotel room by entering a room number (201 to 500)
• Call an external line by entering a 9, followed by the number

• Call various hotel services
• 0 = Operator
• 7 = Room Service
• 8 = Reception

Write a set of test cases to adequately test this telephone system

Positive/Valid Tests

<pre>Input Expected Result
----------------------
0 Operator
201 Room 201 (valid boundary)
405 Room 405 (valid partition)
500 Room 500 (valid boundary)
7 Room Service
8 Reception
9 Outside line</pre>
Negative/In-valid Tests

<pre>Input Expected Result
--------------------------

1 Error
6 Error
200 Error (invalid boundary)
501 Error (invalid boundary)
550 Error (invalid partition)</pre>
Any other button Error

Destructive Tests

What if I accidentally hit multiple buttons?

What if I entered an 0800 number without first
getting an outside line (operator should answer)