* Support mixed-case group entries
The `group` resource downcased the input parameter unless the target
was a Windows node. However, it's completely legitimate for a Unix-y
node to have mixed case group and passwd entries.
This change does have the potential to break people that did not carefully
match their case when searching for a group, but we're currently blocking
people from using the group resource properly if they have mixed-case
entries.
Signed-off-by: Adam Leff <adam@leff.co>
* Fix unit tests
Signed-off-by: Adam Leff <adam@leff.co>
`must_equal nil` will fail in MiniTest 6. Changing those to `must_be_nil`
quiets down all the warnings we currently see and preps us for Minitest 6.
Signed-off-by: Adam Leff <adam@leff.co>
