For asserting command output, exact string matches are preferred in most cases. In cases when a pattern match is needed, the test can use regexp ad hoc.
For operations such as closing an issue or merging a PR, we would
display the success icon (a checkmark) in red and magenta colors,
respectively, to reflect the latest state of the record operated on
(red: closed; magenta: merged).
This was always confusing to me, seeing it both in code and in the UI,
because I'm instinctively thinking that it's a bug and have to remind
myself that it's by design.
