diff --git a/.github/workflows/tox.yaml b/.github/workflows/tox.yaml
index 0f8b395d3..3bdd5dba2 100644
--- a/.github/workflows/tox.yaml
+++ b/.github/workflows/tox.yaml
@@ -31,6 +31,27 @@ jobs:
         codecov --verbose --gcov-glob unit_tests/*
   func:
     runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        juju_channel:
+          - latest/stable
+          - 2.9/stable
+          - 2.8/stable
+        bundle:
+          - first
+          - second
+          - third
+        exclude:
+          # disable 'first' and 'second' bundles for juju 2.8 since 'magpie'
+          # is not a promulgated charm in the charmstore, only on charmhub
+          # which 2.8 can't talk to.
+          - juju_channel: 2.8/stable
+            bundle: first
+          - juju_channel: 2.8/stable
+            bundle: second
+    env:
+      TEST_ZAZA_BUG_LP1987332: "on"  # http://pad.lv/1987332
     needs: build
     steps:
     - uses: actions/checkout@v1
@@ -39,7 +60,7 @@ jobs:
         set -euxo pipefail
         python -m pip install --upgrade pip
         pip install tox tox-gh-actions
-        sudo snap install --classic juju
+        sudo snap install --channel ${{ matrix.juju_channel }} --classic juju
         sudo snap install --classic juju-crashdump
         sudo lxd init --auto
         # This is a throw-away CI environment, do not do this at home
@@ -56,13 +77,15 @@ jobs:
       run: |
         set -euxo pipefail
         mkdir logs
-        tox -e func | tee logs/tox-output.txt
-        juju status -m $(juju models --format yaml|grep "^- name:.*zaza"|cut -f2 -d/) | tee logs/juju-status.txt
+        tox -e func-target -- ${{ matrix.bundle }} | tee logs/tox-output.txt
     - name: crashdump on failure
       if: failure()
       run: |
-        set -euxo pipefail
-        juju crashdump -o logs/
+        set -eux
+        juju models
+        model=$(juju models --format yaml|grep "^- name:.*zaza"|cut -f2 -d/)
+        juju status -m $model | tee logs/juju-status.txt
+        juju crashdump -m $model -o logs/
     - name: upload logs on failure
       if: failure()
       uses: actions/upload-artifact@v2
diff --git a/pip.sh b/pip.sh
new file mode 100755
index 000000000..1085da286
--- /dev/null
+++ b/pip.sh
@@ -0,0 +1,3 @@
+#!/bin/bash
+pip install pip==20.2.3
+pip install "$@"
diff --git a/tests/bundles/first.yaml b/tests/bundles/first.yaml
index 7595b3464..ef473c3cd 100644
--- a/tests/bundles/first.yaml
+++ b/tests/bundles/first.yaml
@@ -13,3 +13,9 @@ applications:
   ubuntu:
     charm: ch:ubuntu
     num_units: 3
+  ntp:
+    charm: ch:ntp
+    num_units: 0
+relations:
+  - - ubuntu
+    - ntp
diff --git a/tests/bundles/second.yaml b/tests/bundles/second.yaml
index b4ead7f8f..362a15b02 100644
--- a/tests/bundles/second.yaml
+++ b/tests/bundles/second.yaml
@@ -8,3 +8,9 @@ applications:
   ubuntu:
     charm: ch:ubuntu
     num_units: 3
+  ntp:
+    charm: ch:ntp
+    num_units: 0
+relations:
+  - - ubuntu
+    - ntp
diff --git a/tests/bundles/third.yaml b/tests/bundles/third.yaml
index c6294bbc7..1b2235d4a 100644
--- a/tests/bundles/third.yaml
+++ b/tests/bundles/third.yaml
@@ -1,6 +1,11 @@
 series: focal
 applications:
   ubuntu:
-    charm: ch:ubuntu
+    charm: ubuntu
     num_units: 10
-
+  ntp:
+    charm: ntp
+    num_units: 0
+relations:
+  - - ubuntu
+    - ntp
diff --git a/tox.ini b/tox.ini
index 62df7615c..44328e376 100644
--- a/tox.ini
+++ b/tox.ini
@@ -22,7 +22,7 @@ whitelist_external = juju
 passenv = HOME TERM CS_* OS_* TEST_*
 deps = -r{toxinidir}/requirements.txt
 install_command =
-  pip install {opts} {packages}
+  {toxinidir}/pip.sh install {opts} {packages}
 commands = nosetests --with-coverage --cover-package=zaza {posargs} {toxinidir}/unit_tests
 
 [testenv:py3]
@@ -56,7 +56,14 @@ basepython = python3
 deps = -r{toxinidir}/requirements.txt
 commands =
     {envdir}/bin/python3 setup.py install
-    functest-run-suite --keep-model
+    functest-run-suite --keep-faulty-model
+
+[testenv:func-target]
+basepython = python3
+deps = -r{toxinidir}/requirements.txt
+commands =
+    {envdir}/bin/python3 setup.py install
+    functest-run-suite --keep-model --bundle {posargs}
 
 [testenv:remove-placement]
 basepython = python3
diff --git a/unit_tests/utilities/test_zaza_utilities_juju.py b/unit_tests/utilities/test_zaza_utilities_juju.py
index f15b3e4f5..7fa5e2187 100644
--- a/unit_tests/utilities/test_zaza_utilities_juju.py
+++ b/unit_tests/utilities/test_zaza_utilities_juju.py
@@ -13,6 +13,7 @@
 # limitations under the License.
 
 import mock
+import os
 import unit_tests.utils as ut_utils
 from zaza.utilities import juju as juju_utils
 
@@ -411,6 +412,51 @@ def test_get_subordinate_units(self):
                 status=juju_status),
             ['cinder-ceph/3'])
 
+    def test_get_subordinate_units_lp1987332(self):
+        juju_status = mock.MagicMock()
+        juju_status.applications = {
+            'nova-compute': {
+                'charm': 'ch:amd64/focal/nova-compute-1',
+                'units': {
+                    'nova-compute/0': {
+                        'subordinates': {
+                            'neutron-openvswitch/2': {
+                                'charm': ''}}}}},
+            'cinder': {
+                'charm': 'ch:amd64/focal/cinder-2',
+                'units': {
+                    'cinder/1': {
+                        'subordinates': {
+                            'cinder-hacluster/0': {
+                                'charm': ''},
+                            'cinder-ceph/3': {
+                                'charm': ''}}}}},
+            'cinder-hacluster': {
+                'charm': 'ch:amd64/focal/hacluster-3',
+            },
+            'cinder-ceph': {
+                'charm': 'ch:amd64/focal/cinder-ceph-4',
+            },
+            'neutron-openvswitch': {
+                'charm': 'ch:amd64/focal/neutron-openvswitch-5',
+            },
+        }
+        self.model.get_status.return_Value = juju_status
+        with mock.patch.dict(os.environ,
+                             {'TEST_ZAZA_BUG_LP1987332': '1'}):
+            self.assertEqual(
+                sorted(juju_utils.get_subordinate_units(
+                    ['nova-compute/0', 'cinder/1'],
+                    status=juju_status)),
+                sorted(['neutron-openvswitch/2', 'cinder-hacluster/0',
+                        'cinder-ceph/3']))
+            self.assertEqual(
+                juju_utils.get_subordinate_units(
+                    ['nova-compute/0', 'cinder/1'],
+                    charm_name='ceph',
+                    status=juju_status),
+                ['cinder-ceph/3'])
+
     def test_get_application_ip(self):
         self.model.get_application_config.return_value = {
             'vip': {'value': '10.0.0.10'}}
diff --git a/zaza/charm_tests/libjuju/tests.py b/zaza/charm_tests/libjuju/tests.py
index ca266a127..67b66cf59 100644
--- a/zaza/charm_tests/libjuju/tests.py
+++ b/zaza/charm_tests/libjuju/tests.py
@@ -20,6 +20,7 @@
 import unittest
 
 import zaza.model
+import zaza.utilities.juju as juju_utils
 
 
 class RegressionTest(unittest.TestCase):
@@ -50,3 +51,14 @@ def test_02_get_unit_public_address(self):
         for ip in ips:
             logging.info("Ip found %s", ip)
             self.assertIsNotNone(ip)
+
+    def test_03_get_subordinates(self):
+        """Get the subordinates associated to a principal."""
+        logging.info('Get the list of subordinates.')
+        units = [u.entity_id for u in zaza.model.get_units('ubuntu')]
+        logging.info('principal units found: %s', units)
+        subordinate = juju_utils.get_subordinate_units([units[0]],
+                                                       charm_name='ntp')
+        logging.info('subordinate(s) found %s for principal %s',
+                     subordinate, units[0])
+        self.assertEqual(len(subordinate), 1)
diff --git a/zaza/utilities/juju.py b/zaza/utilities/juju.py
index 95dd94671..de9b942e9 100644
--- a/zaza/utilities/juju.py
+++ b/zaza/utilities/juju.py
@@ -480,9 +480,14 @@ def get_subordinate_units(unit_list, charm_name=None, status=None,
         subs = status.applications[app_name]['units'][unit_name].get(
             'subordinates') or {}
         if charm_name:
-            for unit_name, unit_data in subs.items():
-                if charm_name in unit_data['charm']:
-                    sub_units.append(unit_name)
+            for subordinate_name, unit_data in subs.items():
+                if os.environ.get('TEST_ZAZA_BUG_LP1987332'):
+                    sub_app = subordinate_name.split('/')[0]
+                    charm = status.applications[sub_app]['charm']
+                else:
+                    charm = unit_data['charm']
+                if charm_name in charm:
+                    sub_units.append(subordinate_name)
         else:
             sub_units.extend([n for n in subs.keys()])
     return sub_units