=== TC 1 ===
 1. Open Image dialog
 1. Enter some url
 1. Leave dimension fields empty
 1. Press OK
 * Image dialog should be closed, immage with specified link and size, should be applied into edit area.
=== TC 2 ===
 1. Open Image dialog
 1. Enter some url
 1. Enter "0" (zeros) in width and height fields
 1. Press OK
 * Image dialog should not be closed, warning message, containing information about inproper data enetered as size, should appear.
=== TC 3 ===
 1. Open Image dialog
 1. Enter some url
 1. Enter numbers with comma into size fields
 1. Press OK
 * Image dialog should not be closed, warning message, containing information about inproper data enetered as size, should appear.
=== TC 4 ===
 1. Open Image dialog
 1. Enter some url
 1. Enter numbers less than zero into size fields
 1. Press OK
 * Image dialog should not be closed, warning message, containing information about inproper data enetered as size, should appear.
=== TC 5 ===
 1. Open Image dialog
 1. Enter some url
 1. Enter numbers with percent "%" into size fields
 1. Press OK
 * Image dialog should be closed, immage with specified link and size, should be applied into edit area.
=== TC 6 ===
 1. Open Image dialog
 1. Enter some url
 1. Enter random characters into size fields
 1. Press OK
 * Image dialog should not be closed, warning message, containing information about inproper data enetered as size, should appear.