This test requires administrator access and for ATTO to be the top editor in Site administration>Plugins>Text editor>Manage editors.
1) As an administrator, navigate to Site administration>Plugins>Text editors>ATTO HTML editor>Collapse toolbar settings.
2) Change the number to 2 and save.
3) Access the ATTO text editor (for example by posting in a course News forum) and verify you just see two groups ('Show more' and 'Paragraph/Bold/Italic')
4) Repeat step 1.
5) Change the number to 10 and save.
6) Repeat step 3 and verify you now see 10 groups of icons.
7) Repeat step 1 and change the number back to the default of 5 and save.
8) Repeat step 3, verifying you now see 5 groups.