XWIKI-22041: Image pasted during tests has no alternative

[Sereza7]

Jira URL

https://jira.xwiki.org/browse/XWIKI-22041

Changes

Description

• Added an alt in the copied content

Clarifications

• The image-alt WCAG violation happened when the viewpage where we copy the image was opened (during test setup). I updated the HTML to add an alt, and updated the result to match this change.
• Now the assertion will fail if the alt is not kept through the pasting+editing process.

Screenshots & Video

None, development issue only

Executed Tests

Passed mvn clean install -f xwiki-platform-core/xwiki-platform-ckeditor/xwiki-platform-ckeditor-test -P docker,integration-tests,quality -Dxwiki.test.ui.wcag=true successfully. In the wcagWarnings, there is no image-alt rule violation anymore.
With the more specific mvn clean install -f xwiki-platform-core/xwiki-platform-ckeditor/xwiki-platform-ckeditor-test -P docker,integration-tests,quality -Dxwiki.test.ui.wcag=true -Dit.test=ImageIT#pasteAndEditExternalImage, there is no WCAG violation reported at all anymore.

Expected merging strategy

• Prefers squash: Yes
• Backport on branches:
  • 15.10.x , development only change, low scope of impact and not dangerous.