The test maintenance update is broken in openSUSE:Factory:Update. Installing
update-test-trivial from the TW OSS repository does make the zypper maintenance
update available/needed, despite it being in the repository.

This indicates that the maintenance update stack is not being tested in
Tumbleweed. Same for (at least) update-test-security.

Install the non-updated package:

$ zypper in --from tw-oss update-test-trivial
$ zypper search -s -t package update-test-trivial.x86_64

S  | Name                | Type    | Version | Arch   | Repository
---+---------------------+---------+---------+--------+-----------
v  | update-test-trivial | package | 5-5.1   | x86_64 | tw-update
i+ | update-test-trivial | package | 5-4.11  | x86_64 | tw-oss
v  | update-test-trivial | package | 5-4.1   | x86_64 | tw-update

Update is not available:

$ zypper lp
No updates found.

But a newer packages is available:

$ zypper lu
S | Repository | Name                | Current Version | Available Version |
Arch
--+------------+---------------------+-----------------+-------------------+-------
v | tw-update  | update-test-trivial | 5-4.11          | 5-5.1             |
x86_64

The patch seems to refer a previous package

$ zypper info -t patch update-test-trivial

Information for patch update-test-trivial:
------------------------------------------
Repository  : tw-update
Name        : update-test-trivial
Version     : 1
Arch        : noarch
Vendor      : BenniBrunner
Status      : applied
Category    : recommended
Severity    : low
Created On  : Thu Mar  1 11:28:21 2018
Interactive : ---
Summary     : Test-update for openSUSE Tumbleweed
Description : 
    This is a trivial test-update for openSUSE Tumbleweed.
Provides    : patch:update-test-trivial = 1
Conflicts   : [4]
    update-test-trivial.src < 5-4.1
    update-test-trivial.noarch < 5-4.1
    update-test-trivial.x86_64 < 5-4.1
    update-test-trivial.i586 < 5-4.1