By the way, here are some XPaths we generated for the buttons while looking at your test. Just in case you want to use them:
Bold //div[contains(@class,'Text')]/descendant::button[@class='ql-bold']
Italic //div[contains(@class,'Text')]/descendant::button[@class='ql-italic']
Underline //div[contains(@class,'Text')]/descendant::button[@class='ql-underline']
Strikethrough //div[contains(@class,'Text')]/descendant::button[@class='ql-strike']
Regards,
Subject7 Team