diff --git a/.gitignore b/.gitignore
index 1b19277..23630d6 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,9 +1,6 @@
 .tox
-tmp
-build
-layers
-interfaces
-__pycache__
-.testrepository
 .stestr
-.pyc
+*__pycache__*
+*.pyc
+*.swp
+build
diff --git a/.stestr.conf b/.stestr.conf
new file mode 100644
index 0000000..5fcccac
--- /dev/null
+++ b/.stestr.conf
@@ -0,0 +1,3 @@
+[DEFAULT]
+test_path=./unit_tests
+top_dir=./
diff --git a/.testr.conf b/.testr.conf
deleted file mode 100644
index 801646b..0000000
--- a/.testr.conf
+++ /dev/null
@@ -1,8 +0,0 @@
-[DEFAULT]
-test_command=OS_STDOUT_CAPTURE=${OS_STDOUT_CAPTURE:-1} \
-             OS_STDERR_CAPTURE=${OS_STDERR_CAPTURE:-1} \
-             OS_TEST_TIMEOUT=${OS_TEST_TIMEOUT:-60} \
-             ${PYTHON:-python} -m subunit.run discover -t ./ ./unit_tests $LISTOPT $IDOPTION
-
-test_id_option=--load-list $IDFILE
-test_list_option=--list
diff --git a/requirements.txt b/requirements.txt
new file mode 100644
index 0000000..20f335d
--- /dev/null
+++ b/requirements.txt
@@ -0,0 +1,7 @@
+# This file is managed centrally.  If you find the need to modify this as a
+# one-off, please don't.  Intead, consult #openstack-charms and ask about
+# requirements management in charms via bot-control.  Thank you.
+#
+# Build requirements
+charm-tools>=2.4.4
+simplejson
diff --git a/src/layer.yaml b/src/layer.yaml
index df0afb1..349c33a 100644
--- a/src/layer.yaml
+++ b/src/layer.yaml
@@ -2,4 +2,4 @@ includes:
   - 'layer:openstack'
   - 'interface:cinder-backend'
 
-repo: https://github.com/mskalka/charm-cinder-purestorage
+repo: https://github.com/openstack-charmers/charm-cinder-purestorage
diff --git a/test-requirements.txt b/test-requirements.txt
index 9a0bed8..14b380e 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -1,7 +1,13 @@
-# Unit test requirements
+# This file is managed centrally.  If you find the need to modify this as a
+# one-off, please don't.  Intead, consult #openstack-charms and ask about
+# requirements management in charms via bot-control.  Thank you.
+#
+# Lint and unit test requirements
 flake8>=2.2.4,<=2.4.1
-os-testr>=0.4.1
+stestr>=2.2.0
+requests>=2.18.4
 charms.reactive
 mock>=1.2
+nose>=1.3.7
 coverage>=3.6
-git+https://github.com/openstack/charms.openstack#egg=charms.openstack
+git+https://github.com/openstack/charms.openstack.git#egg=charms.openstack
diff --git a/tox.ini b/tox.ini
index 38038ac..504ce1e 100644
--- a/tox.ini
+++ b/tox.ini
@@ -3,56 +3,75 @@
 # within individual charm repos.
 [tox]
 skipsdist = True
-envlist = pep8,py34,py35
-skip_missing_interpreters = True
+envlist = pep8,py3
 
 [testenv]
 setenv = VIRTUAL_ENV={envdir}
          PYTHONHASHSEED=0
          TERM=linux
          LAYER_PATH={toxinidir}/layers
-         INTERFACE_PATH={toxinidir}/interfaces
          JUJU_REPOSITORY={toxinidir}/build
-passenv = http_proxy https_proxy USER
+passenv = http_proxy https_proxy INTERFACE_PATH
 install_command =
   pip install {opts} {packages}
 deps =
     -r{toxinidir}/requirements.txt
 
 [testenv:build]
-basepython = python2.7
+basepython = python3
 commands =
     charm-build --log-level DEBUG -o {toxinidir}/build src {posargs}
 
-[testenv:py27]
-basepython = python2.7
-# Reactive source charms are Python3-only, but a py27 unit test target
-# is required by OpenStack Governance.  Remove this shim as soon as
-# permitted.  http://governance.openstack.org/reference/cti/python_cti.html
-whitelist_externals = true
-commands = true
-
-[testenv:py34]
-basepython = python3.4
+[testenv:py3]
+basepython = python3
 deps = -r{toxinidir}/test-requirements.txt
-commands = ostestr {posargs}
+commands = stestr run {posargs}
 
 [testenv:py35]
 basepython = python3.5
 deps = -r{toxinidir}/test-requirements.txt
-commands = ostestr {posargs}
+commands = stestr run {posargs}
 
 [testenv:py36]
 basepython = python3.6
 deps = -r{toxinidir}/test-requirements.txt
-commands = ostestr {posargs}
+commands = stestr run {posargs}
 
 [testenv:pep8]
-basepython = python3.5
+basepython = python3
 deps = -r{toxinidir}/test-requirements.txt
 commands = flake8 {posargs} src unit_tests
 
+[testenv:cover]
+# Technique based heavily upon
+# https://github.com/openstack/nova/blob/master/tox.ini
+basepython = python3
+deps = -r{toxinidir}/requirements.txt
+       -r{toxinidir}/test-requirements.txt
+setenv =
+    {[testenv]setenv}
+    PYTHON=coverage run
+commands =
+    coverage erase
+    stestr run {posargs}
+    coverage combine
+    coverage html -d cover
+    coverage xml -o cover/coverage.xml
+    coverage report
+
+[coverage:run]
+branch = True
+concurrency = multiprocessing
+parallel = True
+source =
+    .
+omit =
+    .tox/*
+    */charmhelpers/*
+    unit_tests/*
+
 [testenv:venv]
+basepython = python3
 commands = {posargs}
 
 [flake8]