Test matrix-bridge-mautrix-signal with Molecule

.github/renovate.json

@@ -90,6 +90,7 @@
         "roles/custom/matrix-bridge-hookshot/defaults/main.yml",
         "roles/custom/matrix-bridge-mautrix-discord/defaults/main.yml",
         "roles/custom/matrix-bridge-mautrix-meta-messenger/defaults/main.yml",
+        "roles/custom/matrix-bridge-mautrix-signal/defaults/main.yml",
         "roles/custom/matrix-bridge-mautrix-whatsapp/defaults/main.yml",
         "roles/custom/matrix-bridge-postmoogle/defaults/main.yml"
       ],

roles/custom/matrix-bridge-mautrix-signal/molecule/default/converge.yml

@@ -0,0 +1,36 @@
+# SPDX-FileCopyrightText: 2026 Slavi Pantaleev
+#
+# SPDX-License-Identifier: AGPL-3.0-or-later
+
+---
+- name: Include roles for mautrix-signal Molecule tests
+  hosts: all
+  become: true
+  vars_files:
+    - "{{ lookup('env', 'MOLECULE_PROJECT_DIRECTORY') }}/../../../molecule-shared/playbook-context.yml"
+  gather_facts: true
+  tasks:
+    - name: Include roles for mautrix-signal Molecule tests
+      ansible.builtin.include_role:
+        name: "{{ role_name }}"
+        public: true
+      loop:
+        - com.devture.ansible.role.playbook_help
+        - com.devture.ansible.role.systemd_docker_base
+        - "custom/{{ lookup('env', 'MOLECULE_PROJECT_DIRECTORY') | basename }}"
+      loop_control:
+        loop_var: role_name
+
+- name: Ensure mautrix-signal is started
+  hosts: all
+  become: true
+  gather_facts: false
+  tasks:
+    - name: Ensure systemd daemon is reloaded
+      ansible.builtin.systemd_service:
+        daemon_reload: true
+
+    - name: Ensure the mautrix-signal systemd service is started
+      ansible.builtin.systemd_service:
+        name: matrix-mautrix-signal.service
+        state: started

roles/custom/matrix-bridge-mautrix-signal/molecule/default/molecule.yml

@@ -0,0 +1,94 @@
+# SPDX-FileCopyrightText: 2026 Slavi Pantaleev
+#
+# SPDX-License-Identifier: AGPL-3.0-or-later
+
+---
+dependency:
+  name: galaxy
+  options:
+    requirements-file: requirements.yml
+    force: true
+driver:
+  name: docker
+platforms:
+  - name: mautrix-signal-${MOLECULE_DISTRO:-ubuntu2604}-default
+    image: "geerlingguy/docker-${MOLECULE_DISTRO:-ubuntu2604}-ansible:latest"
+    command: ${MOLECULE_DOCKER_COMMAND:-""}
+    volumes:
+      - /sys/fs/cgroup:/sys/fs/cgroup:rw
+    cgroupns_mode: host
+    privileged: true
+    pre_build_image: true
+provisioner:
+  name: ansible
+  config_options:
+    defaults:
+      callback_result_format: yaml
+  inventory:
+    group_vars:
+      all:
+        matrix_bridge_mautrix_signal_container_network: mautrix-signal-molecule
+
+        # The stub prepare.yml stands up. It is not a real homeserver and the scenario
+        # deliberately carries no Signal credentials or linked Signal account.
+        matrix_bridge_mautrix_signal_homeserver_address: http://matrix.molecule.local:8008
+        matrix_bridge_mautrix_signal_homeserver_domain: molecule.local
+
+        # Postgres is what group_vars/matrix_servers selects whenever Postgres is enabled,
+        # which is the default deployment path. The non-default database and user names make
+        # schema creation evidence that the role composed and supplied this connection string.
+        matrix_bridge_mautrix_signal_database_engine: postgres
+        matrix_bridge_mautrix_signal_database_hostname: matrix-postgres-molecule
+        matrix_bridge_mautrix_signal_database_name: molecule_signal
+        matrix_bridge_mautrix_signal_database_username: molecule_signal
+        matrix_bridge_mautrix_signal_database_password: molecule_pg_password_b723e1
+
+        # These are only Molecule fixtures which must reach both the configuration and the
+        # registration. They do not authenticate against a real homeserver.
+        matrix_bridge_mautrix_signal_appservice_token: molecule_signal_as_token_0c981a
+        matrix_bridge_mautrix_signal_homeserver_token: molecule_signal_hs_token_45de72
+
+        # Each differs from the role's default, so structural checks can distinguish the
+        # role's rendered values from values the bridge would have chosen on its own.
+        matrix_bridge_mautrix_signal_appservice_bot_username: molecule-signalbot
+        matrix_bridge_mautrix_signal_command_prefix: "!molecule-signal"
+        matrix_bridge_mautrix_signal_logging_level: info
+        matrix_bridge_mautrix_signal_federate_rooms: false
+        matrix_bridge_mautrix_signal_extev_polls: true
+        matrix_bridge_mautrix_signal_bridge_relay_enabled: true
+        matrix_bridge_mautrix_signal_bridge_relay_admin_only: false
+        matrix_bridge_mautrix_signal_backfill_max_initial_messages: 17
+
+        # Traefik is not started. These values exercise the role's composition of both the
+        # public address the bridge reads and the exposure labels Docker consumes.
+        matrix_bridge_mautrix_signal_exposure_enabled: true
+        matrix_bridge_mautrix_signal_exposure_hostname: signal-api.molecule.local
+        matrix_bridge_mautrix_signal_exposure_path_prefix: /bridges/signal-api
+        matrix_bridge_mautrix_signal_scheme: http
+        matrix_bridge_mautrix_signal_container_labels_traefik_entrypoints: web
+        matrix_bridge_mautrix_signal_container_labels_additional_labels: |
+          molecule.signal.coverage=enabled
+
+        # verify.yml is a separate play, where role defaults are out of scope, so paths it
+        # reads are pinned here to the values the role derives during converge.
+        matrix_bridge_mautrix_signal_base_path: /matrix/mautrix-signal
+        matrix_bridge_mautrix_signal_config_path: /matrix/mautrix-signal/config
+        matrix_bridge_mautrix_signal_data_path: /matrix/mautrix-signal/data
+  env:
+    # Workaround for https://github.com/ansible/molecule/issues/4391
+    ANSIBLE_ROLES_PATH: ${MOLECULE_PROJECT_DIRECTORY}/../..:/.ansible/roles:/usr/share/ansible/roles:/etc/ansible/roles:${ANSIBLE_HOME:-~/.ansible}/roles
+scenario:
+  test_sequence:
+    - dependency
+    - cleanup
+    - destroy
+    - syntax
+    - create
+    - prepare
+    - converge
+    - idempotence
+    - verify
+    - cleanup
+    - destroy
+verifier:
+  name: ansible

roles/custom/matrix-bridge-mautrix-signal/molecule/default/prepare.yml

@@ -0,0 +1,91 @@
+# SPDX-FileCopyrightText: 2026 Slavi Pantaleev
+#
+# SPDX-License-Identifier: AGPL-3.0-or-later
+
+---
+- name: Prepare mautrix-signal Molecule tests
+  hosts: all
+  become: true
+  vars_files:
+    - "{{ lookup('env', 'MOLECULE_PROJECT_DIRECTORY') }}/../../../molecule-shared/vars.yml"
+    - "{{ lookup('env', 'MOLECULE_PROJECT_DIRECTORY') }}/../../../molecule-shared/playbook-context.yml"
+  gather_facts: true
+  tasks:
+    - name: Ensure apt cache is updated
+      ansible.builtin.apt:
+        update_cache: true
+        cache_valid_time: 600
+      when: ansible_os_family == 'Debian'
+
+    - name: Ensure required packages are installed
+      ansible.builtin.package:
+        name:
+          - python3-requests
+          - fuse-overlayfs
+        state: present
+
+    - name: Ensure Docker is installed
+      ansible.builtin.include_role:
+        name: ansible-role-docker
+      vars:
+        docker_daemon_options:
+          storage-driver: fuse-overlayfs
+
+    # The role's file tasks set owner/group by name, which Ansible resolves through the
+    # passwd database. matrix-base creates these in a complete playbook run.
+    - name: Ensure the matrix group exists
+      ansible.builtin.group:
+        name: "{{ matrix_group_name }}"
+        gid: "{{ matrix_user_gid }}"
+        state: present
+
+    - name: Ensure the matrix user exists
+      ansible.builtin.user:
+        name: "{{ matrix_user_name }}"
+        uid: "{{ matrix_user_uid }}"
+        group: "{{ matrix_group_name }}"
+        create_home: false
+        system: true
+        state: present
+
+    - name: Ensure the base data path exists
+      ansible.builtin.file:
+        path: "{{ matrix_base_data_path }}"
+        state: directory
+        owner: "{{ matrix_user_name }}"
+        group: "{{ matrix_group_name }}"
+        mode: "0750"
+
+    # The role creates this during converge, but both dependencies below must attach to it
+    # first, so prepare creates it early.
+    - name: Ensure the container network the role attaches to exists
+      ansible.builtin.command:
+        argv:
+          - docker
+          - network
+          - create
+          - "{{ matrix_bridge_mautrix_signal_container_network }}"
+      register: mautrix_signal_molecule_network
+      changed_when: mautrix_signal_molecule_network.rc == 0
+      failed_when:
+        - mautrix_signal_molecule_network.rc != 0
+        - "'already exists' not in mautrix_signal_molecule_network.stderr"
+
+    - name: Ensure Postgres is running
+      ansible.builtin.include_tasks:
+        file: "{{ lookup('env', 'MOLECULE_PROJECT_DIRECTORY') }}/../../../molecule-shared/tasks/postgres.yml"
+      vars:
+        molecule_shared_postgres_network: "{{ matrix_bridge_mautrix_signal_container_network }}"
+        molecule_shared_postgres_database: "{{ matrix_bridge_mautrix_signal_database_name }}"
+        molecule_shared_postgres_username: "{{ matrix_bridge_mautrix_signal_database_username }}"
+        molecule_shared_postgres_password: "{{ matrix_bridge_mautrix_signal_database_password }}"
+
+    # The bridge calls /whoami while starting and refuses to run if it does not name its bot.
+    # No Signal login is attempted: an unlinked, idle bridge is the intended test state.
+    - name: Ensure the homeserver stub is running
+      ansible.builtin.include_tasks:
+        file: "{{ lookup('env', 'MOLECULE_PROJECT_DIRECTORY') }}/../../../molecule-shared/tasks/homeserver-stub.yml"
+      vars:
+        molecule_shared_stub_network: "{{ matrix_bridge_mautrix_signal_container_network }}"
+        molecule_shared_stub_server_name: "{{ matrix_bridge_mautrix_signal_homeserver_domain }}"
+        molecule_shared_stub_user_id: "@{{ matrix_bridge_mautrix_signal_appservice_bot_username }}:{{ matrix_bridge_mautrix_signal_homeserver_domain }}"

roles/custom/matrix-bridge-mautrix-signal/molecule/default/requirements.yml

@@ -0,0 +1 @@
+../../../../../molecule-shared/requirements.yml

roles/custom/matrix-bridge-mautrix-signal/molecule/default/verify.yml

@@ -0,0 +1,271 @@
+# SPDX-FileCopyrightText: 2026 Slavi Pantaleev
+#
+# SPDX-License-Identifier: AGPL-3.0-or-later
+
+---
+# Proves the bridge starts without a Signal account, accepts the configuration and
+# registration the role rendered, becomes ready against the homeserver stub, migrates its
+# Postgres schema, and carries the role's runtime identity and public-exposure wiring.
+- name: Verify mautrix-signal
+  hosts: all
+  become: true
+  vars_files:
+    - "{{ lookup('env', 'MOLECULE_PROJECT_DIRECTORY') }}/../../../molecule-shared/vars.yml"
+    - "{{ lookup('env', 'MOLECULE_PROJECT_DIRECTORY') }}/../../../molecule-shared/playbook-context.yml"
+  # Lazily evaluated after the corresponding slurp. Keeping these as play vars avoids
+  # repeatedly templating the Go templates embedded in the bridge configuration.
+  vars:
+    mautrix_signal_config: "{{ mautrix_signal_config_file.content | b64decode | from_yaml }}"
+    mautrix_signal_registration: "{{ mautrix_signal_registration_file.content | b64decode | from_yaml }}"
+    mautrix_signal_labels_rendered: "{{ mautrix_signal_labels.content | b64decode }}"
+    mautrix_signal_expected_public_address: http://signal-api.molecule.local/bridges/signal-api
+  gather_facts: false
+
+  tasks:
+    - name: Load the role's defaults under a separate name
+      ansible.builtin.include_vars:
+        file: "{{ lookup('env', 'MOLECULE_PROJECT_DIRECTORY') }}/defaults/main.yml"
+        name: mautrix_signal_role_defaults
+
+    - name: Wait for the mautrix-signal service to become active
+      ansible.builtin.systemd_service:
+        name: matrix-mautrix-signal.service
+      register: mautrix_signal_service
+      until: mautrix_signal_service.status.ActiveState == 'active'
+      retries: 30
+      delay: 5
+      failed_when: false
+
+    # Restart=always makes ActiveState alone insufficient for a crash-looping bridge.
+    - name: Assert the service is active and has not been restarting
+      ansible.builtin.assert:
+        that:
+          - mautrix_signal_service.status.ActiveState == 'active'
+          - mautrix_signal_service.status.NRestarts is defined
+          - mautrix_signal_service.status.NRestarts | int == 0
+        fail_msg: >-
+          matrix-mautrix-signal.service is
+          {{ mautrix_signal_service.status.ActiveState | default('unknown') }}
+          after {{ mautrix_signal_service.status.NRestarts | default('?') }} restart(s)
+        success_msg: "matrix-mautrix-signal.service is active and has not restarted"
+
+    # /live proves the appservice listener opened; /ready additionally proves startup passed
+    # the homeserver identity check and database initialization.
+    - name: Wait for the bridge liveness endpoint
+      ansible.builtin.command:
+        argv:
+          - docker
+          - run
+          - --rm
+          - --network={{ matrix_bridge_mautrix_signal_container_network }}
+          - "{{ molecule_shared_image_curl }}"
+          - --silent
+          - --output
+          - /dev/null
+          - --write-out
+          - "HTTP_STATUS=%{http_code}"
+          - http://matrix-mautrix-signal:8080/_matrix/mau/live
+      register: mautrix_signal_live
+      changed_when: false
+      until: "'HTTP_STATUS=200' in mautrix_signal_live.stdout"
+      retries: 24
+      delay: 5
+      failed_when: false
+
+    - name: Wait for the bridge readiness endpoint
+      ansible.builtin.command:
+        argv:
+          - docker
+          - run
+          - --rm
+          - --network={{ matrix_bridge_mautrix_signal_container_network }}
+          - "{{ molecule_shared_image_curl }}"
+          - --silent
+          - --output
+          - /dev/null
+          - --write-out
+          - "HTTP_STATUS=%{http_code}"
+          - http://matrix-mautrix-signal:8080/_matrix/mau/ready
+      register: mautrix_signal_ready
+      changed_when: false
+      until: "'HTTP_STATUS=200' in mautrix_signal_ready.stdout"
+      retries: 24
+      delay: 5
+      failed_when: false
+
+    - name: Assert the bridge is live and ready on its appservice port
+      ansible.builtin.assert:
+        that:
+          - "'HTTP_STATUS=200' in mautrix_signal_live.stdout"
+          - "'HTTP_STATUS=200' in mautrix_signal_ready.stdout"
+        fail_msg: >-
+          The appservice health responses were live={{ mautrix_signal_live.stdout | default('none') }}
+          and ready={{ mautrix_signal_ready.stdout | default('none') }}
+        success_msg: "The bridge is live and ready on its appservice port"
+
+    - name: Read the configuration the role rendered
+      ansible.builtin.slurp:
+        src: "{{ matrix_bridge_mautrix_signal_config_path }}/config.yaml"
+      register: mautrix_signal_config_file
+
+    - name: Assert the rendered configuration carries this scenario's values
+      ansible.builtin.assert:
+        that:
+          - mautrix_signal_config.homeserver.address == matrix_bridge_mautrix_signal_homeserver_address
+          - mautrix_signal_config.homeserver.domain == matrix_bridge_mautrix_signal_homeserver_domain
+          - mautrix_signal_config.appservice.bot.username == matrix_bridge_mautrix_signal_appservice_bot_username
+          - mautrix_signal_config.appservice.as_token == matrix_bridge_mautrix_signal_appservice_token
+          - mautrix_signal_config.appservice.hs_token == matrix_bridge_mautrix_signal_homeserver_token
+          - mautrix_signal_config.appservice.public_address == mautrix_signal_expected_public_address
+          - mautrix_signal_config.bridge.command_prefix == matrix_bridge_mautrix_signal_command_prefix
+          - mautrix_signal_config.bridge.relay.enabled
+          - not mautrix_signal_config.bridge.relay.admin_only
+          - not mautrix_signal_config.matrix.federate_rooms
+          - mautrix_signal_config.network.extev_polls
+          - mautrix_signal_config.backfill.max_initial_messages == 17
+          - mautrix_signal_config.logging.min_level == matrix_bridge_mautrix_signal_logging_level
+        fail_msg: "The rendered configuration does not carry the scenario's non-default values"
+        success_msg: "The rendered configuration carries the scenario's non-default values"
+
+    - name: Assert the configuration points at the scenario's Postgres database
+      ansible.builtin.assert:
+        that:
+          - mautrix_signal_config.database.type == matrix_bridge_mautrix_signal_database_engine
+          - matrix_bridge_mautrix_signal_database_username in mautrix_signal_config.database.uri
+          - matrix_bridge_mautrix_signal_database_hostname in mautrix_signal_config.database.uri
+          - matrix_bridge_mautrix_signal_database_name in mautrix_signal_config.database.uri
+        fail_msg: >-
+          database.uri is {{ mautrix_signal_config.database.uri | default('unset') }}, which
+          was not composed from the scenario's connection settings
+        success_msg: "The configuration points at the scenario's Postgres database"
+
+    - name: Read the appservice registration the role rendered
+      ansible.builtin.slurp:
+        src: "{{ matrix_bridge_mautrix_signal_config_path }}/registration.yaml"
+      register: mautrix_signal_registration_file
+
+    - name: Assert the registration carries the tokens, identity and address
+      ansible.builtin.assert:
+        that:
+          - mautrix_signal_registration.id == 'signal'
+          - mautrix_signal_registration.as_token == matrix_bridge_mautrix_signal_appservice_token
+          - mautrix_signal_registration.hs_token == matrix_bridge_mautrix_signal_homeserver_token
+          - mautrix_signal_registration.sender_localpart == '_bot_' + matrix_bridge_mautrix_signal_appservice_bot_username
+          - mautrix_signal_registration.url == 'http://matrix-mautrix-signal:8080'
+        fail_msg: "The appservice registration does not carry the expected identity and tokens"
+        success_msg: "The appservice registration carries the expected identity and tokens"
+
+    - name: Assert the registration namespaces cover the bot and Signal ghosts
+      ansible.builtin.assert:
+        that:
+          - mautrix_signal_ghost_regex | length > 0
+          - mautrix_signal_bot_regex | length > 0
+          - mautrix_signal_ghost_mxid is match(mautrix_signal_ghost_regex)
+          - mautrix_signal_wrong_ghost_mxid is not match(mautrix_signal_ghost_regex)
+          - mautrix_signal_bot_mxid is match(mautrix_signal_bot_regex)
+        fail_msg: "The registration namespaces do not cover the bot and Signal ghost identities"
+        success_msg: "The registration namespaces cover the bot and Signal ghost identities"
+      vars:
+        mautrix_signal_user_regexes: "{{ mautrix_signal_registration.namespaces.users | map(attribute='regex') | list }}"
+        mautrix_signal_ghost_regex: "{{ mautrix_signal_user_regexes | select('search', 'signal_') | first | default('') }}"
+        mautrix_signal_bot_regex: "{{ mautrix_signal_user_regexes | reject('search', 'signal_') | first | default('') }}"
+        mautrix_signal_ghost_mxid: "@signal_01234567-89ab-cdef-0123-456789abcdef:{{ matrix_bridge_mautrix_signal_homeserver_domain }}"
+        mautrix_signal_wrong_ghost_mxid: "@telegram_01234567-89ab-cdef-0123-456789abcdef:{{ matrix_bridge_mautrix_signal_homeserver_domain }}"
+        mautrix_signal_bot_mxid: "@{{ matrix_bridge_mautrix_signal_appservice_bot_username }}:{{ matrix_bridge_mautrix_signal_homeserver_domain }}"
+
+    # Tables can only appear after hostname resolution, authentication, and migrations.
+    - name: List the tables the bridge created in Postgres
+      ansible.builtin.command:
+        argv:
+          - docker
+          - exec
+          - matrix-postgres-molecule
+          - psql
+          - --username={{ matrix_bridge_mautrix_signal_database_username }}
+          - --dbname={{ matrix_bridge_mautrix_signal_database_name }}
+          - --tuples-only
+          - --no-align
+          - --command=SELECT tablename FROM pg_tables WHERE schemaname = 'public'
+      register: mautrix_signal_tables
+      changed_when: false
+
+    - name: Assert the bridge migrated its schema into the configured database
+      ansible.builtin.assert:
+        that:
+          - mautrix_signal_tables.rc == 0
+          - "'version' in mautrix_signal_table_names"
+          - mautrix_signal_table_names | length > 5
+        fail_msg: >-
+          The bridge did not create its schema in {{ matrix_bridge_mautrix_signal_database_name }}
+          (found {{ mautrix_signal_table_names | length }} table(s))
+        success_msg: "The bridge migrated its schema into the configured database"
+      vars:
+        mautrix_signal_table_names: "{{ mautrix_signal_tables.stdout_lines | select | list }}"
+
+    - name: Read the running container's image and user identity
+      ansible.builtin.command:
+        argv:
+          - docker
+          - container
+          - inspect
+          - matrix-mautrix-signal
+          - --format
+          - "{{ '{{' }} .Config.Image {{ '}}' }}|{{ '{{' }} .Config.User {{ '}}' }}"
+      register: mautrix_signal_container_identity
+      changed_when: false
+
+    - name: Assert the running container uses the exact pinned image
+      ansible.builtin.assert:
+        that:
+          - mautrix_signal_container_image == 'dock.mau.dev/mautrix/signal:' + mautrix_signal_role_defaults.matrix_bridge_mautrix_signal_version
+        fail_msg: "The running container does not use the exact image the role pins"
+        success_msg: "The running container uses the exact image the role pins"
+      vars:
+        mautrix_signal_container_image: "{{ mautrix_signal_container_identity.stdout.split('|')[0] }}"
+
+    - name: Assert the running container uses the playbook-supplied identity
+      ansible.builtin.assert:
+        that:
+          - mautrix_signal_container_user == (matrix_user_uid | string) + ':' + (matrix_user_gid | string)
+        fail_msg: "The running container does not use the {{ matrix_user_uid }}:{{ matrix_user_gid }} identity"
+        success_msg: "The running container uses the playbook-supplied identity"
+      vars:
+        mautrix_signal_container_user: "{{ mautrix_signal_container_identity.stdout.split('|')[1] }}"
+
+    - name: Read the labels the role rendered
+      ansible.builtin.slurp:
+        src: "{{ matrix_bridge_mautrix_signal_base_path }}/labels"
+      register: mautrix_signal_labels
+
+    - name: Assert the labels route the public endpoint to the appservice port
+      ansible.builtin.assert:
+        that:
+          - "'traefik.enable=true' in mautrix_signal_labels_rendered"
+          - "'traefik.docker.network=' + matrix_bridge_mautrix_signal_container_network in mautrix_signal_labels_rendered"
+          - "'traefik.http.services.matrix-mautrix-signal-exposure.loadbalancer.server.port=8080' in mautrix_signal_labels_rendered"
+          - "'traefik.http.routers.matrix-mautrix-signal-exposure.rule=Host(`signal-api.molecule.local`) && PathPrefix(`/bridges/signal-api`)' in mautrix_signal_labels_rendered"
+          - "'traefik.http.middlewares.matrix-mautrix-signal-exposure-strip-prefix.stripprefix.prefixes=/bridges/signal-api' in mautrix_signal_labels_rendered"
+          - "'traefik.http.routers.matrix-mautrix-signal-exposure.entrypoints=web' in mautrix_signal_labels_rendered"
+          - "'traefik.http.routers.matrix-mautrix-signal-exposure.tls=false' in mautrix_signal_labels_rendered"
+          - "'molecule.signal.coverage=enabled' in mautrix_signal_labels_rendered"
+        fail_msg: "The rendered labels do not carry the scenario's exposure configuration"
+        success_msg: "The rendered labels carry the scenario's exposure configuration"
+
+    - name: Read the custom label Docker attached to the running container
+      ansible.builtin.command:
+        argv:
+          - docker
+          - container
+          - inspect
+          - matrix-mautrix-signal
+          - --format
+          - "{{ '{{' }} index .Config.Labels \"molecule.signal.coverage\" {{ '}}' }}"
+      register: mautrix_signal_container_label
+      changed_when: false
+
+    - name: Assert Docker accepted the label file the role rendered
+      ansible.builtin.assert:
+        that:
+          - mautrix_signal_container_label.stdout == 'enabled'
+        fail_msg: "Docker did not attach the role's custom Molecule label"
+        success_msg: "Docker accepted the label file the role rendered"