User who has not high enough security level cannot access Add Product process, Delete Product process and Update Product process. Therefore, those three buttons must be greyed out. There will be no action if user try to click those buttons. There are 2 possibilities that the system response to the user:

1. INPUT:
   • A warehouse manager click Add product button
   EXPECTED RESULTS:
   • A cursor will be moved at the end of the table to let the user to enter the new product information

2. INPUT:
   • A stocker try to click Add Product button
   EXPECTED RESULTS:
   • No action, since the button is greyed out

Add product will consider the following conditions:

1. INPUT:
   • CORRECT format of UPC
   • CORRECT unit cost(positive real number)
   • CORRECT bulk unit size(positive real number)
   EXPECTED RESULTS:
   • A new product is added to the data base

2. INPUT:
   • INCORRECT format of UPC, unit cost or bulk unit size
   EXPECTED RESULTS:
   • Error message display 'Incorrect format of UPC, unit cost or bulk unit size'

3. INPUT:
   • A UPC that is already in use
   EXPECTED RESULTS:
   • Error message display 'UPC is already in use'

1. INPUT:
   • User did not highlight the product before he/she click the Delete button
   EXPECTED RESULTS:
   • No action

2. INPUT:
   • The product still has some stock or on order
   EXPECTED RESULTS:
   • Error message display 'Product still has stock or is on order, please clear stock and ordering first'

Test plan for update product process is the same as Add Product Process 3.1.

1. INPUT:
   • Product is highlighted on the table
   EXPECTED RESULTS:
   • The highlighted product is printed on the printer

1. INPUT:
   • Non exists UPC, description, category or unit cost
   EXPECTED RESULTS:
   • Message display 'No product match'

2. INPUT:
   • Exists UPC, description, category or unit cost
   EXPECTED RESULTS:
   • Product(s) which match the input will be display on the screen

3. INPUT:
   • User click CANCEL button
   EXPECTED RESULTS:
   • No action to find process and return to Product Interface

Since user cannot select more then one choice, there will be no error message to be displayed.

1. INPUT:
   • UPC, description category or cost price(unit cost)
   EXPECTED RESULTS:
   • A sorted table will be displayed on the screen

1. INPUT:
   • User click Exit button
   EXPECTED RESULTS:
   • Main Menu Interface load up

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