diff --git a/molecule-shared/playbook-context.yml b/molecule-shared/playbook-context.yml
index cd0982b5c..4e56480e6 100644
--- a/molecule-shared/playbook-context.yml
+++ b/molecule-shared/playbook-context.yml
@@ -54,3 +54,27 @@ matrix_bridges_relay_enabled: false
 matrix_bridges_exposure_enabled: true
 matrix_bridges_exposure_hostname: molecule.local
 matrix_bridges_exposure_path_prefix: /bridges
+
+# --- Public hostnames (matrix-base) ----------------------------------------
+#
+# 18 of the roles here read one of these. Rendered against the scenario's
+# matrix_domain rather than left as Jinja, so a scenario can read them in
+# verify.yml without the role's defaults being in scope.
+
+matrix_server_fqn_matrix: matrix.molecule.local
+matrix_server_fqn_matrix_federation: matrix.molecule.local
+matrix_server_fqn_element: element.molecule.local
+matrix_server_fqn_hydrogen: hydrogen.molecule.local
+matrix_server_fqn_cinny: cinny.molecule.local
+matrix_server_fqn_sable: sable.molecule.local
+matrix_server_fqn_schildichat: schildichat.molecule.local
+matrix_server_fqn_fluffychat: fluffychat.molecule.local
+matrix_server_fqn_buscarron: buscarron.molecule.local
+matrix_server_fqn_etherpad: etherpad.molecule.local
+matrix_server_fqn_jitsi: jitsi.molecule.local
+matrix_server_fqn_grafana: stats.molecule.local
+matrix_server_fqn_sygnal: sygnal.molecule.local
+matrix_server_fqn_mautrix_wsproxy: wsproxy.molecule.local
+matrix_server_fqn_ntfy: ntfy.molecule.local
+matrix_server_fqn_rageshake: rageshake.molecule.local
+matrix_server_fqn_matrixto: mt.molecule.local
diff --git a/roles/custom/matrix-bridge-heisenbridge/molecule/default/converge.yml b/roles/custom/matrix-bridge-heisenbridge/molecule/default/converge.yml
new file mode 100644
index 000000000..989ed2bb6
--- /dev/null
+++ b/roles/custom/matrix-bridge-heisenbridge/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 heisenbridge 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 heisenbridge 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 heisenbridge 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 heisenbridge systemd service is started
+      ansible.builtin.systemd_service:
+        name: matrix-heisenbridge.service
+        state: started
diff --git a/roles/custom/matrix-bridge-heisenbridge/molecule/default/molecule.yml b/roles/custom/matrix-bridge-heisenbridge/molecule/default/molecule.yml
new file mode 100644
index 000000000..f465908cf
--- /dev/null
+++ b/roles/custom/matrix-bridge-heisenbridge/molecule/default/molecule.yml
@@ -0,0 +1,75 @@
+# 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: heisenbridge-${MOLECULE_DISTRO:-ubuntu2604}-default
+    image: "geerlingguy/docker-${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_heisenbridge_container_network: heisenbridge-molecule
+
+        # The stub prepare.yml stands up. Heisenbridge talks to it while
+        # starting; it is not a real homeserver and nothing is asserted about it.
+        matrix_bridge_heisenbridge_homeserver_url: http://matrix.molecule.local:8008
+
+        matrix_bridge_heisenbridge_appservice_token: molecule_as_token_4f2a91
+
+        # Heisenbridge refuses to start without an owner - it is the Matrix user
+        # allowed to administer the bridge.
+        matrix_bridge_heisenbridge_owner: "@molecule-admin:molecule.local"
+
+        # Deliberately different from the role's defaults, so verify.yml can tell
+        # what the role rendered apart from what heisenbridge would have chosen.
+        matrix_bridge_heisenbridge_path_prefix: /molecule-heisenbridge
+
+        # identd binds host port 113, which would collide with anything else on
+        # the machine and is not what this scenario is proving.
+        matrix_bridge_heisenbridge_identd_enabled: false
+
+        # Traefik is not deployed here, so the labels the role would render for
+        # it are switched off and their absence is asserted instead.
+        matrix_bridge_heisenbridge_container_labels_traefik_enabled: false
+
+        # verify.yml runs as its own play, where role defaults are out of scope.
+        # Unlike the mautrix bridges, heisenbridge keeps everything directly
+        # under its base path rather than in config/ and data/ subdirectories.
+        matrix_bridge_heisenbridge_base_path: /matrix/heisenbridge
+  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/roles
+scenario:
+  test_sequence:
+    - dependency
+    - cleanup
+    - destroy
+    - syntax
+    - create
+    - prepare
+    - converge
+    - idempotence
+    - verify
+    - cleanup
+    - destroy
+verifier:
+  name: ansible
diff --git a/roles/custom/matrix-bridge-heisenbridge/molecule/default/prepare.yml b/roles/custom/matrix-bridge-heisenbridge/molecule/default/prepare.yml
new file mode 100644
index 000000000..1058fec61
--- /dev/null
+++ b/roles/custom/matrix-bridge-heisenbridge/molecule/default/prepare.yml
@@ -0,0 +1,81 @@
+# SPDX-FileCopyrightText: 2026 Slavi Pantaleev
+#
+# SPDX-License-Identifier: AGPL-3.0-or-later
+
+---
+- name: Prepare heisenbridge 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 and Ansible resolves those
+    # through the passwd database, so they have to exist first. matrix-base
+    # creates them in a real deployment.
+    - 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"
+
+    - name: Ensure the container network the role attaches to exists
+      ansible.builtin.command:
+        argv:
+          - docker
+          - network
+          - create
+          - "{{ matrix_bridge_heisenbridge_container_network }}"
+      register: heisenbridge_molecule_network
+      changed_when: heisenbridge_molecule_network.rc == 0
+      failed_when:
+        - heisenbridge_molecule_network.rc != 0
+        - "'already exists' not in heisenbridge_molecule_network.stderr"
+
+    # The bridge contacts the homeserver as it starts. It is not being asked to
+    # bridge anything - see molecule-shared/homeserver-stub.py.
+    - 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_heisenbridge_container_network }}"
+        molecule_shared_stub_server_name: molecule.local
+        molecule_shared_stub_user_id: "@heisenbridge:molecule.local"
diff --git a/roles/custom/matrix-bridge-heisenbridge/molecule/default/requirements.yml b/roles/custom/matrix-bridge-heisenbridge/molecule/default/requirements.yml
new file mode 120000
index 000000000..1567a5392
--- /dev/null
+++ b/roles/custom/matrix-bridge-heisenbridge/molecule/default/requirements.yml
@@ -0,0 +1 @@
+../../../../../molecule-shared/requirements.yml
\ No newline at end of file
diff --git a/roles/custom/matrix-bridge-heisenbridge/molecule/default/verify.yml b/roles/custom/matrix-bridge-heisenbridge/molecule/default/verify.yml
new file mode 100644
index 000000000..9c1d1e4c1
--- /dev/null
+++ b/roles/custom/matrix-bridge-heisenbridge/molecule/default/verify.yml
@@ -0,0 +1,130 @@
+# SPDX-FileCopyrightText: 2026 Slavi Pantaleev
+#
+# SPDX-License-Identifier: AGPL-3.0-or-later
+
+---
+# What this proves: heisenbridge starts, reads the registration the role
+# rendered, and is the version the role pins. It does NOT connect to IRC and
+# never will. See docs/molecule-testing.md.
+- name: Verify heisenbridge
+  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: 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: heisenbridge_role_defaults
+
+    - name: Wait for the heisenbridge service to become active
+      ansible.builtin.systemd_service:
+        name: matrix-heisenbridge.service
+      register: heisenbridge_service
+      until: heisenbridge_service.status.ActiveState == 'active'
+      retries: 30
+      delay: 5
+      failed_when: false
+
+    # `Restart=always` means a bridge crash-looping on a configuration it cannot
+    # read still reports `active`, so the restart counter is checked too.
+    - name: Assert the service is active and has not been restarting
+      ansible.builtin.assert:
+        that:
+          - heisenbridge_service.status.ActiveState == 'active'
+          - heisenbridge_service.status.NRestarts is defined
+          - heisenbridge_service.status.NRestarts | int == 0
+        fail_msg: >-
+          matrix-heisenbridge.service is
+          {{ heisenbridge_service.status.ActiveState | default('unknown') }}
+          after {{ heisenbridge_service.status.NRestarts | default('?') }}
+          automatic restart(s)
+        success_msg: "matrix-heisenbridge.service is active and has not restarted"
+
+    # Heisenbridge keeps everything directly under its base path rather than in
+    # config/ and data/ subdirectories the way the mautrix bridges do.
+    - name: Read the appservice registration the role rendered
+      ansible.builtin.slurp:
+        src: "{{ matrix_bridge_heisenbridge_base_path }}/registration.yaml"
+      register: heisenbridge_registration_file
+
+    # The token and the URL both differ from anything heisenbridge would pick on
+    # its own, so their presence means the role rendered this file rather than
+    # the bridge generating one.
+    - name: Assert the registration carries the scenario's token and namespace
+      ansible.builtin.assert:
+        that:
+          - matrix_bridge_heisenbridge_appservice_token in heisenbridge_registration_rendered
+          - "'heisenbridge' in heisenbridge_registration_rendered"
+        fail_msg: "The appservice registration does not carry the scenario's token"
+        success_msg: "The appservice registration carries the scenario's token"
+      vars:
+        heisenbridge_registration_rendered: "{{ heisenbridge_registration_file.content | b64decode }}"
+
+    # The owner is what heisenbridge is told to accept administration from, and
+    # the role passes it on the command line rather than through a config file,
+    # so the unit is where it can be checked.
+    - name: Read the systemd unit the role rendered
+      ansible.builtin.slurp:
+        src: /etc/systemd/system/matrix-heisenbridge.service
+      register: heisenbridge_unit_file
+
+    - name: Assert the unit carries the owner and homeserver URL the scenario set
+      ansible.builtin.assert:
+        that:
+          - matrix_bridge_heisenbridge_owner in heisenbridge_unit_rendered
+          - matrix_bridge_heisenbridge_homeserver_url in heisenbridge_unit_rendered
+        fail_msg: "The unit does not carry the scenario's owner and homeserver URL"
+        success_msg: "The unit carries the scenario's owner and homeserver URL"
+      vars:
+        heisenbridge_unit_rendered: "{{ heisenbridge_unit_file.content | b64decode }}"
+
+    # identd binds host port 113 when enabled, and this scenario turns it off.
+    # Asserting its absence keeps the default from silently becoming "on".
+    - name: Assert identd is not published while it is disabled
+      ansible.builtin.assert:
+        that:
+          - "'-p 113:' not in (heisenbridge_unit_file.content | b64decode)"
+        fail_msg: >-
+          The unit publishes identd on port 113 even though
+          matrix_bridge_heisenbridge_identd_enabled is false
+        success_msg: "identd is not published while it is disabled"
+
+    - name: Read the image of the running container
+      ansible.builtin.command:
+        argv:
+          - docker
+          - container
+          - inspect
+          - matrix-heisenbridge
+          - --format
+          - "{{ '{{' }} .Config.Image {{ '}}' }}"
+      register: heisenbridge_image
+      changed_when: false
+
+    - name: Assert the running container is the version defaults/main.yml pins
+      ansible.builtin.assert:
+        that:
+          - heisenbridge_role_defaults.matrix_bridge_heisenbridge_version | string in heisenbridge_image.stdout
+        fail_msg: >-
+          The running container is {{ heisenbridge_image.stdout }}, which does not
+          carry the pinned version
+          {{ heisenbridge_role_defaults.matrix_bridge_heisenbridge_version }}
+        success_msg: "The running container is the version defaults/main.yml pins"
+
+    - name: Read the labels the role rendered
+      ansible.builtin.slurp:
+        src: "{{ matrix_bridge_heisenbridge_base_path }}/labels"
+      register: heisenbridge_labels
+
+    - name: Assert no Traefik labels are emitted while Traefik support is disabled
+      ansible.builtin.assert:
+        that:
+          - "'traefik.' not in (heisenbridge_labels.content | b64decode)"
+        fail_msg: >-
+          Traefik labels were emitted even though
+          matrix_bridge_heisenbridge_container_labels_traefik_enabled is false
+        success_msg: "No Traefik labels are emitted while Traefik support is disabled"