Hookshot is the widest HTTP surface of the bridges here - an appservice port
plus a `listeners` list whose entries appear or vanish with independent
switches - so the scenario asserts on that surface rather than on "it started".

The scenario configures NO third-party service. GitHub, GitLab, Jira and Figma
each need an account and a credential somewhere else, which is where a scenario
stops testing this repository (docs/molecule-testing.md). GitLab, which the role
turns on by default, is switched off and its absence from both config.yml and
the registration's namespaces is asserted. The generic webhooks listener needs
no credential from anyone, and is what gets exercised live: a POST to an unknown
hook id comes back as `{"ok":false,"error":"Webhook not found"}`, which only
Hookshot's own generic-webhook handler produces - an Express "Cannot POST" page
there would mean the port is Hookshot's but the service was never mounted on it.

Every port the scenario sets differs from both the role's default and Hookshot's
own, and the run asserts both halves: the webhooks, metrics and appservice ports
it chose all answer, and 9000/9001/9003/9993 - what the role would have used
instead - all refuse. Metrics are off in the role's defaults, so that listener
exists only because the scenario asked for it, and /metrics answers with
`hookshot_*` series that nothing else could have produced.

config.yml and registration.yml are parsed as YAML and asserted structurally, so
a value landing under the wrong key cannot pass as a substring match.

Two things the role made necessary:

- `tasks/main.yml` opens with a block tagged `reset-hookshot-encryption`, and
  Ansible runs tagged tasks unless tags are actually selected - so any tagless
  play hits it, and it stops `matrix-hookshot.service` before that service
  exists. The scenario skips the tag, which is what the playbook effectively
  does by always running with `--tags=setup-all,start`.

- The role reads `matrix_host_command_openssl`, which matrix-base defines.
  matrix-bridge-appservice-irc reads it too, so it goes in the shared playbook
  context rather than into this scenario.

Falsified by pointing the webhooks listener at 127.0.0.1 in the role's config
template - a change no file-level assertion can see. Every config and
registration assertion still passed, and the run failed at "Assert the generic
webhooks service is mounted on that listener" with "Port 9741 did not answer as
Hookshot's generic webhooks service". Reverted afterwards.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01SEH3vxYSQ5SV4N5z61eyGT

Proves the bridge starts on the configuration this role rendered: the
systemd unit is active and has not been restarting, the appservice port is
open, config.yaml and registration.yaml (parsed, not grepped) carry the
scenario's homeserver address, bot username, tokens, command prefix,
avatar-proxy key, public address and log level, the sqlite database was
created under the role's data path as the role's uid, and the running
container is the version defaults/main.yml pins.

It does not bridge anything. Discord is behind an account, which is where a
scenario stops being a test of this repository.

Two things are specific to this role rather than copied from the
mautrix-whatsapp scenario:

- mautrix-discord is the only bridge here whose validate_config.yml requires
  a public address. It is composed from hostname + scheme + path prefix, and
  those same three feed the Traefik avatar-proxy labels, so the scenario
  picks a non-`/` path prefix and a non-default scheme and asserts the
  composed router rule and strip-prefix middleware - both in the label file
  and, read back off the running container, as labels Docker accepted.
  Traefik labels are left enabled here for that reason, unlike in the
  mautrix-whatsapp scenario which asserts their absence.

- matrix_bridge_mautrix_discord_bridge_double_puppet_server_map_default in
  the role's defaults references matrix_bridge_beeper_linkedin_homeserver_domain
  and matrix_bridge_beeper_linkedin_homeserver_address - variables belonging
  to a different role, evidently copy-pasted from
  matrix-bridge-beeper-linkedin, and unique to this role among the bridges.
  A playbook run has every role's defaults in scope so it resolves silently;
  a role scenario has only this role loaded and the template fails on the
  undefined name. The scenario neutralises it in its own group_vars rather
  than touching the role.

Falsified the crash-loop assertion: pointing the in-container sqlite path at
a directory that does not exist makes the bridge exit on startup, and the run
then fails at "Assert the service is active and has not been restarting" with
"activating after 5 automatic restart(s)". Reverted, and green again since -
including idempotence.

The second scenario, chosen to be a bridge rather than another HTTP
component: bridges are roughly 40 of the 70 roles here, and validating the
shape on role two is cheaper than discovering it on role forty. It found
two things the first role could not.

Bridges read a whole family of variables from outside themselves -
matrix_bridges_relay_enabled, _encryption_enabled, _encryption_default,
_msc4190_enabled, _self_sign_enabled, plus matrix_admin - all defined in
matrix-base. Since every bridge reads them, they belong in shared context
rather than in each bridge's scenario: molecule-shared/playbook-context.yml
now carries them along with the identity and path variables the first
scenario had inline. Note it is loaded through vars_files, which outranks
inventory group_vars, so it is authoritative; a scenario that wants to prove
one of these reaches the rendered configuration should say so explicitly.

Appservices call /whoami while starting and refuse to run if the id returned
is not the bot user they were configured as - mautrix-whatsapp exits 17 with
"Unexpected user ID in whoami call". The shared stub now takes the id it
should claim to be. Expect every bridge and bot to need this.

What the scenario proves: the bridge starts and stays up, opens its
appservice port, its rendered config and appservice registration carry the
scenario's tokens and bot user, it created its sqlite database under the
role's data path as the role's uid, and it runs the version the role pins.
It does not bridge anything and never will.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

Components here contact a homeserver while starting up and exit if it is
unreachable, so nearly every scenario will need one. Standing up a real
Synapse per role would dominate the run and drag in Postgres, and these
scenarios are not testing Synapse.

The stub answers the handful of endpoints components touch during startup
with the blandest plausible response, and is deliberately permissive: an
unrecognised path returns {} rather than 404, because the goal is to get the
component past its startup checks. It is not an authentication check or a
room state machine, and a scenario should not assert *about* it - if one
starts needing it to behave like a real homeserver, that scenario has
outgrown what these tests are for.

matrix-alertmanager-receiver now includes it instead of carrying its own
inline copy. Verified green afterwards.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

Three things that would not have scaled to 70 roles:

- The Python and Ansible dependency pins were about to be copied into every
  role. They now live once in molecule-shared/, which scenarios reference
  relatively, so they cannot drift apart.
- The helper container images used for probing were hardcoded inline. They
  are pinned once in molecule-shared/vars.yml, carry `# renovate:`
  annotations, and a custom manager in .github/renovate.json keeps them
  current - verified with a local Renovate dry run, which offers
  curl 8.11.1 -> 8.21.0 and python 3.13 -> 3.14-alpine. Seventy invisible
  hardcodes is the blindness class we have been removing elsewhere.
- Running a scenario meant knowing the venv and cd incantation. `just
  molecule <role>` does it, and with no argument lists the roles that have
  a scenario.

Molecule is deliberately not wired into prek: a run takes minutes, pulls
images and needs Docker, which is fine on request and not fine per commit.

docs/molecule-testing.md covers how to run and write these, including the
four things a role here needs that a standalone role does not. AGENTS.md
points at it rather than carrying the detail.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

Not for merging as-is. One role's scenario plus the workflow that would
make per-role testing affordable here, so we can see how it behaves before
deciding whether to do the other 69.

Unlike the MASH repositories, one repository holds every role, so running
everything on every push is not an option. The workflow's first job works
out which roles a push touched and builds the matrix from that; a change to
docs, or to a role with no scenario yet, runs nothing.

Three things this role needed that a MASH role does not:

- The variables matrix-base would supply (matrix_base_data_path,
  matrix_domain, matrix_user_name, matrix_group_name and the uid/gid) have
  to be provided by the scenario, and the user and group have to exist
  before the role's file tasks run.
- The service contacts the homeserver while starting up - it fetches
  /_matrix/client/v3/joined_rooms to resolve its room mapping and exits 1
  if that fails - so prepare.yml stands up a stub homeserver. Most roles
  here are bridges and bots, so this is likely the rule rather than the
  exception.
- verify.yml runs as its own play, where role defaults are out of scope, so
  the paths it reads are pinned in molecule.yml. The version is deliberately
  NOT pinned: it is read from defaults/main.yml so the assertion compares
  the running image against what the role ships.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>