Exercises G21

description:
printing application only selects laser printer by default
even if the user selects DMP printer
when the application is unable to locate the laser printer,
it tries to find the dot matrix printer (DMP). the application
attempts to print using DMP but repeatedly gives an error message.

steps to reproduce:
1. launch the printing app
2. select the DMP option from the menu
3. sleect print command
4. choose the document to be printed from the laser printer instead of DMT
5.disconnect the laser printer
6. select print command again

Expected Results:

1.the application should accept users choice of printer options
2.when the laser printer is unavailable, the application should locate the DMP without errors

Actual Results:

1. the application always selects the laser printer
2. when the laser printer is unavailable, the app tries to print through DMP printer and displays error message