/
test_testing.py
1082 lines (980 loc) · 42.2 KB
/
test_testing.py
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# Copyright 2019-2020 Canonical Ltd.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import importlib
import pathlib
import shutil
import sys
import tempfile
import textwrap
import unittest
import yaml
from ops.charm import (
CharmBase,
RelationEvent,
)
from ops.framework import (
Object,
)
from ops.model import (
ActiveStatus,
MaintenanceStatus,
UnknownStatus,
ModelError,
RelationNotFoundError,
)
from ops.testing import Harness
class TestHarness(unittest.TestCase):
def test_add_relation(self):
harness = Harness(CharmBase, meta='''
name: test-app
requires:
db:
interface: pgsql
''')
self.addCleanup(harness.cleanup)
rel_id = harness.add_relation('db', 'postgresql')
self.assertIsInstance(rel_id, int)
backend = harness._backend
self.assertEqual(backend.relation_ids('db'), [rel_id])
self.assertEqual(backend.relation_list(rel_id), [])
# Make sure the initial data bags for our app and unit are empty.
self.assertEqual(backend.relation_get(rel_id, 'test-app', is_app=True), {})
self.assertEqual(backend.relation_get(rel_id, 'test-app/0', is_app=False), {})
def test_add_relation_and_unit(self):
harness = Harness(CharmBase, meta='''
name: test-app
requires:
db:
interface: pgsql
''')
self.addCleanup(harness.cleanup)
rel_id = harness.add_relation('db', 'postgresql')
self.assertIsInstance(rel_id, int)
harness.add_relation_unit(rel_id, 'postgresql/0')
harness.update_relation_data(rel_id, 'postgresql/0', {'foo': 'bar'})
backend = harness._backend
self.assertEqual(backend.relation_ids('db'), [rel_id])
self.assertEqual(backend.relation_list(rel_id), ['postgresql/0'])
self.assertEqual(
backend.relation_get(rel_id, 'postgresql/0', is_app=False),
{'foo': 'bar'})
def test_add_relation_with_remote_app_data(self):
# language=YAML
harness = Harness(CharmBase, meta='''
name: test-app
requires:
db:
interface: pgsql
''')
self.addCleanup(harness.cleanup)
remote_app = 'postgresql'
rel_id = harness.add_relation('db', remote_app)
harness.update_relation_data(rel_id, 'postgresql', {'app': 'data'})
self.assertIsInstance(rel_id, int)
backend = harness._backend
self.assertEqual([rel_id], backend.relation_ids('db'))
self.assertEqual({'app': 'data'}, backend.relation_get(rel_id, remote_app, is_app=True))
def test_add_relation_with_our_initial_data(self):
class InitialDataTester(CharmBase):
"""Record the relation-changed events."""
def __init__(self, framework):
super().__init__(framework)
self.observed_events = []
self.framework.observe(self.on.db_relation_changed, self._on_db_relation_changed)
def _on_db_relation_changed(self, event):
self.observed_events.append(event)
# language=YAML
harness = Harness(InitialDataTester, meta='''
name: test-app
requires:
db:
interface: pgsql
''')
self.addCleanup(harness.cleanup)
rel_id = harness.add_relation('db', 'postgresql')
harness.update_relation_data(rel_id, 'test-app', {'k': 'v1'})
harness.update_relation_data(rel_id, 'test-app/0', {'ingress-address': '192.0.2.1'})
backend = harness._backend
self.assertEqual({'k': 'v1'}, backend.relation_get(rel_id, 'test-app', is_app=True))
self.assertEqual({'ingress-address': '192.0.2.1'},
backend.relation_get(rel_id, 'test-app/0', is_app=False))
harness.begin()
self.assertEqual({'k': 'v1'}, backend.relation_get(rel_id, 'test-app', is_app=True))
self.assertEqual({'ingress-address': '192.0.2.1'},
backend.relation_get(rel_id, 'test-app/0', is_app=False))
# Make sure no relation-changed events are emitted for our own data bags.
self.assertEqual([], harness.charm.observed_events)
# A remote unit can still update our app relation data bag since our unit is not a leader.
harness.update_relation_data(rel_id, 'test-app', {'k': 'v2'})
# And we get an event
self.assertEqual([], harness.charm.observed_events)
# We can also update our own relation data, even if it is a bit 'cheaty'
harness.update_relation_data(rel_id, 'test-app/0', {'ingress-address': '192.0.2.2'})
# But no event happens
# Updating our data app relation data bag and our unit data bag does not generate events.
harness.set_leader(True)
harness.update_relation_data(rel_id, 'test-app', {'k': 'v3'})
harness.update_relation_data(rel_id, 'test-app/0', {'ingress-address': '192.0.2.2'})
self.assertEqual([], harness.charm.observed_events)
def test_add_peer_relation_with_initial_data_leader(self):
class InitialDataTester(CharmBase):
"""Record the relation-changed events."""
def __init__(self, framework):
super().__init__(framework)
self.observed_events = []
self.framework.observe(self.on.cluster_relation_changed,
self._on_cluster_relation_changed)
def _on_cluster_relation_changed(self, event):
self.observed_events.append(event)
# language=YAML
harness = Harness(InitialDataTester, meta='''
name: test-app
peers:
cluster:
interface: cluster
''')
self.addCleanup(harness.cleanup)
# TODO: dmitriis 2020-04-07 test a minion unit and initial peer relation app data
# events when the harness begins to emit events for initial data.
harness.set_leader(is_leader=True)
rel_id = harness.add_relation('cluster', 'test-app')
harness.update_relation_data(rel_id, 'test-app', {'k': 'v'})
harness.update_relation_data(rel_id, 'test-app/0', {'ingress-address': '192.0.2.1'})
backend = harness._backend
self.assertEqual({'k': 'v'}, backend.relation_get(rel_id, 'test-app', is_app=True))
self.assertEqual({'ingress-address': '192.0.2.1'},
backend.relation_get(rel_id, 'test-app/0', is_app=False))
harness.begin()
self.assertEqual({'k': 'v'}, backend.relation_get(rel_id, 'test-app', is_app=True))
self.assertEqual({'ingress-address': '192.0.2.1'},
backend.relation_get(rel_id, 'test-app/0', is_app=False))
# Make sure no relation-changed events are emitted for our own data bags.
self.assertEqual([], harness.charm.observed_events)
# Updating our app relation data bag and our unit data bag does not trigger events
harness.update_relation_data(rel_id, 'test-app', {'k': 'v2'})
harness.update_relation_data(rel_id, 'test-app/0', {'ingress-address': '192.0.2.2'})
self.assertEqual([], harness.charm.observed_events)
# If our unit becomes a minion, updating app relation data indirectly becomes possible
# and our charm gets notifications.
harness.set_leader(False)
harness.update_relation_data(rel_id, 'test-app', {'k': 'v3'})
self.assertEqual({'k': 'v3'}, backend.relation_get(rel_id, 'test-app', is_app=True))
self.assertTrue(len(harness.charm.observed_events), 1)
self.assertIsInstance(harness.charm.observed_events[0], RelationEvent)
def test_relation_events(self):
harness = Harness(RelationEventCharm, meta='''
name: test-app
requires:
db:
interface: pgsql
''')
self.addCleanup(harness.cleanup)
harness.begin()
harness.charm.observe_relation_events('db')
self.assertEqual(harness.charm.get_changes(), [])
rel_id = harness.add_relation('db', 'postgresql')
self.assertEqual(
harness.charm.get_changes(),
[{'name': 'relation-created',
'data': {
'app': 'postgresql',
'unit': None,
'relation_id': rel_id,
}}])
harness.add_relation_unit(rel_id, 'postgresql/0')
self.assertEqual(
harness.charm.get_changes(),
[{'name': 'relation-joined',
'data': {
'app': 'postgresql',
'unit': 'postgresql/0',
'relation_id': rel_id,
}}])
harness.update_relation_data(rel_id, 'postgresql', {'foo': 'bar'})
self.assertEqual(
harness.charm.get_changes(),
[{'name': 'relation-changed',
'data': {
'app': 'postgresql',
'unit': None,
'relation_id': rel_id,
}}])
harness.update_relation_data(rel_id, 'postgresql/0', {'baz': 'bing'})
self.assertEqual(
harness.charm.get_changes(),
[{'name': 'relation-changed',
'data': {
'app': 'postgresql',
'unit': 'postgresql/0',
'relation_id': rel_id,
}}])
def test_get_relation_data(self):
harness = Harness(CharmBase, meta='''
name: test-app
requires:
db:
interface: pgsql
''')
self.addCleanup(harness.cleanup)
rel_id = harness.add_relation('db', 'postgresql')
harness.update_relation_data(rel_id, 'postgresql', {'remote': 'data'})
self.assertEqual(harness.get_relation_data(rel_id, 'test-app'), {})
self.assertEqual(harness.get_relation_data(rel_id, 'test-app/0'), {})
self.assertEqual(harness.get_relation_data(rel_id, 'test-app/1'), None)
self.assertEqual(harness.get_relation_data(rel_id, 'postgresql'), {'remote': 'data'})
with self.assertRaises(KeyError):
# unknown relation id
harness.get_relation_data(99, 'postgresql')
def test_create_harness_twice(self):
metadata = '''
name: my-charm
requires:
db:
interface: pgsql
'''
harness1 = Harness(CharmBase, meta=metadata)
self.addCleanup(harness1.cleanup)
harness2 = Harness(CharmBase, meta=metadata)
self.addCleanup(harness2.cleanup)
harness1.begin()
harness2.begin()
helper1 = DBRelationChangedHelper(harness1.charm, "helper1")
helper2 = DBRelationChangedHelper(harness2.charm, "helper2")
rel_id = harness2.add_relation('db', 'postgresql')
harness2.update_relation_data(rel_id, 'postgresql', {'key': 'value'})
# Helper2 should see the event triggered by harness2, but helper1 should see no events.
self.assertEqual(helper1.changes, [])
self.assertEqual(helper2.changes, [(rel_id, 'postgresql')])
def test_begin_twice(self):
# language=YAML
harness = Harness(CharmBase, meta='''
name: test-app
requires:
db:
interface: pgsql
''')
self.addCleanup(harness.cleanup)
harness.begin()
with self.assertRaises(RuntimeError):
harness.begin()
def test_update_relation_exposes_new_data(self):
harness = Harness(CharmBase, meta='''
name: my-charm
requires:
db:
interface: pgsql
''')
self.addCleanup(harness.cleanup)
harness.begin()
viewer = RelationChangedViewer(harness.charm, 'db')
rel_id = harness.add_relation('db', 'postgresql')
harness.add_relation_unit(rel_id, 'postgresql/0')
harness.update_relation_data(rel_id, 'postgresql/0', {'initial': 'data'})
self.assertEqual(viewer.changes, [{'initial': 'data'}])
harness.update_relation_data(rel_id, 'postgresql/0', {'new': 'value'})
self.assertEqual(viewer.changes, [{'initial': 'data'},
{'initial': 'data', 'new': 'value'}])
def test_update_relation_no_local_unit_change_event(self):
# language=YAML
harness = Harness(CharmBase, meta='''
name: my-charm
requires:
db:
interface: pgsql
''')
self.addCleanup(harness.cleanup)
harness.begin()
helper = DBRelationChangedHelper(harness.charm, "helper")
rel_id = harness.add_relation('db', 'postgresql')
rel = harness.charm.model.get_relation('db')
rel.data[harness.charm.model.unit]['key'] = 'value'
# there should be no event for updating our own data
harness.update_relation_data(rel_id, 'my-charm/0', {'new': 'other'})
# but the data will be updated.
self.assertEqual({'key': 'value', 'new': 'other'}, rel.data[harness.charm.model.unit])
rel.data[harness.charm.model.unit]['new'] = 'value'
# Our unit data bag got updated.
self.assertEqual(rel.data[harness.charm.model.unit]['new'], 'value')
# But there were no changed events registered by our unit.
self.assertEqual([], helper.changes)
def test_update_peer_relation_no_local_unit_change_event(self):
# language=YAML
harness = Harness(CharmBase, meta='''
name: postgresql
peers:
db:
interface: pgsql
''')
self.addCleanup(harness.cleanup)
harness.begin()
helper = DBRelationChangedHelper(harness.charm, "helper")
rel_id = harness.add_relation('db', 'postgresql')
rel = harness.charm.model.get_relation('db')
rel.data[harness.charm.model.unit]['key'] = 'value'
rel = harness.charm.model.get_relation('db')
harness.update_relation_data(rel_id, 'postgresql/0', {'key': 'v1'})
self.assertEqual({'key': 'v1'}, rel.data[harness.charm.model.unit])
# Make sure there was no event
self.assertEqual([], helper.changes)
rel.data[harness.charm.model.unit]['key'] = 'v2'
# Our unit data bag got updated.
self.assertEqual({'key': 'v2'}, dict(rel.data[harness.charm.model.unit]))
# But there were no changed events registered by our unit.
self.assertEqual([], helper.changes)
# Same for when our unit is a leader.
harness.set_leader(is_leader=True)
harness.update_relation_data(rel_id, 'postgresql/0', {'key': 'v3'})
self.assertEqual({'key': 'v3'}, dict(rel.data[harness.charm.model.unit]))
self.assertEqual([], helper.changes)
rel.data[harness.charm.model.unit]['key'] = 'v4'
self.assertEqual(rel.data[harness.charm.model.unit]['key'], 'v4')
self.assertEqual([], helper.changes)
def test_update_peer_relation_app_data(self):
# language=YAML
harness = Harness(CharmBase, meta='''
name: postgresql
peers:
db:
interface: pgsql
''')
self.addCleanup(harness.cleanup)
harness.begin()
harness.set_leader(is_leader=True)
helper = DBRelationChangedHelper(harness.charm, "helper")
rel_id = harness.add_relation('db', 'postgresql')
rel = harness.charm.model.get_relation('db')
rel.data[harness.charm.app]['key'] = 'value'
harness.update_relation_data(rel_id, 'postgresql', {'key': 'v1'})
self.assertEqual({'key': 'v1'}, rel.data[harness.charm.app])
self.assertEqual([], helper.changes)
rel.data[harness.charm.app]['key'] = 'v2'
# Our unit data bag got updated.
self.assertEqual(rel.data[harness.charm.model.app]['key'], 'v2')
# But there were no changed events registered by our unit.
self.assertEqual([], helper.changes)
# If our unit is not a leader unit we get an update about peer app relation data changes.
harness.set_leader(is_leader=False)
harness.update_relation_data(rel_id, 'postgresql', {'k2': 'v2'})
self.assertEqual(rel.data[harness.charm.model.app]['k2'], 'v2')
self.assertEqual(helper.changes, [(0, 'postgresql')])
def test_update_relation_no_local_app_change_event(self):
# language=YAML
harness = Harness(CharmBase, meta='''
name: my-charm
requires:
db:
interface: pgsql
''')
self.addCleanup(harness.cleanup)
harness.begin()
harness.set_leader(False)
helper = DBRelationChangedHelper(harness.charm, "helper")
rel_id = harness.add_relation('db', 'postgresql')
# TODO: remove this as soon as https://github.com/canonical/operator/issues/175 is fixed.
harness.add_relation_unit(rel_id, 'postgresql/0')
self.assertEqual(helper.changes, [])
harness.update_relation_data(rel_id, 'my-charm', {'new': 'value'})
rel = harness.charm.model.get_relation('db')
self.assertEqual(rel.data[harness.charm.app]['new'], 'value')
# Our app data bag got updated.
self.assertEqual(rel.data[harness.charm.model.app]['new'], 'value')
# But there were no changed events registered by our unit.
self.assertEqual(helper.changes, [])
def test_update_relation_remove_data(self):
harness = Harness(CharmBase, meta='''
name: my-charm
requires:
db:
interface: pgsql
''')
self.addCleanup(harness.cleanup)
harness.begin()
viewer = RelationChangedViewer(harness.charm, 'db')
rel_id = harness.add_relation('db', 'postgresql')
harness.add_relation_unit(rel_id, 'postgresql/0')
harness.update_relation_data(rel_id, 'postgresql/0', {'initial': 'data'})
harness.update_relation_data(rel_id, 'postgresql/0', {'initial': ''})
self.assertEqual(viewer.changes, [{'initial': 'data'}, {}])
def test_update_config(self):
harness = Harness(RecordingCharm)
self.addCleanup(harness.cleanup)
harness.begin()
harness.update_config(key_values={'a': 'foo', 'b': 2})
self.assertEqual(
harness.charm.changes,
[{'name': 'config', 'data': {'a': 'foo', 'b': 2}}])
harness.update_config(key_values={'b': 3})
self.assertEqual(
harness.charm.changes,
[{'name': 'config', 'data': {'a': 'foo', 'b': 2}},
{'name': 'config', 'data': {'a': 'foo', 'b': 3}}])
# you can set config values to the empty string, you can use unset to actually remove items
harness.update_config(key_values={'a': ''}, unset=set('b'))
self.assertEqual(
harness.charm.changes,
[{'name': 'config', 'data': {'a': 'foo', 'b': 2}},
{'name': 'config', 'data': {'a': 'foo', 'b': 3}},
{'name': 'config', 'data': {'a': ''}},
])
def test_set_leader(self):
harness = Harness(RecordingCharm)
self.addCleanup(harness.cleanup)
# No event happens here
harness.set_leader(False)
harness.begin()
self.assertFalse(harness.charm.model.unit.is_leader())
harness.set_leader(True)
self.assertEqual(harness.charm.get_changes(reset=True), [{'name': 'leader-elected'}])
self.assertTrue(harness.charm.model.unit.is_leader())
harness.set_leader(False)
self.assertFalse(harness.charm.model.unit.is_leader())
# No hook event when you lose leadership.
# TODO: verify if Juju always triggers `leader-settings-changed` if you
# lose leadership.
self.assertEqual(harness.charm.get_changes(reset=True), [])
harness.disable_hooks()
harness.set_leader(True)
# No hook event if you have disabled them
self.assertEqual(harness.charm.get_changes(reset=True), [])
def test_relation_set_app_not_leader(self):
harness = Harness(RecordingCharm, meta='''
name: test-charm
requires:
db:
interface: pgsql
''')
self.addCleanup(harness.cleanup)
harness.begin()
harness.set_leader(False)
rel_id = harness.add_relation('db', 'postgresql')
harness.add_relation_unit(rel_id, 'postgresql/0')
rel = harness.charm.model.get_relation('db')
with self.assertRaises(ModelError):
rel.data[harness.charm.app]['foo'] = 'bar'
# The data has not actually been changed
self.assertEqual(harness.get_relation_data(rel_id, 'test-charm'), {})
harness.set_leader(True)
rel.data[harness.charm.app]['foo'] = 'bar'
self.assertEqual(harness.get_relation_data(rel_id, 'test-charm'), {'foo': 'bar'})
def test_hooks_enabled_and_disabled(self):
harness = Harness(RecordingCharm, meta='''
name: test-charm
''')
self.addCleanup(harness.cleanup)
# Before begin() there are no events.
harness.update_config({'value': 'first'})
# By default, after begin the charm is set up to receive events.
harness.begin()
harness.update_config({'value': 'second'})
self.assertEqual(
harness.charm.get_changes(reset=True),
[{'name': 'config', 'data': {'value': 'second'}}])
# Once disabled, we won't see config-changed when we make an update
harness.disable_hooks()
harness.update_config({'third': '3'})
self.assertEqual(harness.charm.get_changes(reset=True), [])
harness.enable_hooks()
harness.update_config({'value': 'fourth'})
self.assertEqual(
harness.charm.get_changes(reset=True),
[{'name': 'config', 'data': {'value': 'fourth', 'third': '3'}}])
def test_metadata_from_directory(self):
tmp = pathlib.Path(tempfile.mkdtemp())
self.addCleanup(shutil.rmtree, str(tmp))
metadata_filename = tmp / 'metadata.yaml'
with metadata_filename.open('wt') as metadata:
metadata.write(textwrap.dedent('''
name: my-charm
requires:
db:
interface: pgsql
'''))
harness = self._get_dummy_charm_harness(tmp)
harness.begin()
self.assertEqual(list(harness.model.relations), ['db'])
# The charm_dir also gets set
self.assertEqual(harness.framework.charm_dir, tmp)
def test_set_model_name(self):
harness = Harness(CharmBase, meta='''
name: test-charm
''')
self.addCleanup(harness.cleanup)
harness.set_model_name('foo')
self.assertEqual('foo', harness.model.name)
def test_set_model_name_after_begin(self):
harness = Harness(CharmBase, meta='''
name: test-charm
''')
self.addCleanup(harness.cleanup)
harness.set_model_name('bar')
harness.begin()
with self.assertRaises(RuntimeError):
harness.set_model_name('foo')
self.assertEqual(harness.model.name, 'bar')
def test_actions_from_directory(self):
tmp = pathlib.Path(tempfile.mkdtemp())
self.addCleanup(shutil.rmtree, str(tmp))
actions_filename = tmp / 'actions.yaml'
with actions_filename.open('wt') as actions:
actions.write(textwrap.dedent('''
test:
description: a dummy action
'''))
harness = self._get_dummy_charm_harness(tmp)
harness.begin()
self.assertEqual(list(harness.framework.meta.actions), ['test'])
# The charm_dir also gets set
self.assertEqual(harness.framework.charm_dir, tmp)
def _get_dummy_charm_harness(self, tmp):
self._write_dummy_charm(tmp)
charm_mod = importlib.import_module('charm')
harness = Harness(charm_mod.MyTestingCharm)
self.addCleanup(harness.cleanup)
return harness
def _write_dummy_charm(self, tmp):
srcdir = tmp / 'src'
srcdir.mkdir(0o755)
charm_filename = srcdir / 'charm.py'
with charm_filename.open('wt') as charmpy:
# language=Python
charmpy.write(textwrap.dedent('''
from ops.charm import CharmBase
class MyTestingCharm(CharmBase):
pass
'''))
orig = sys.path[:]
sys.path.append(str(srcdir))
def cleanup():
sys.path = orig
sys.modules.pop('charm')
self.addCleanup(cleanup)
def test_actions_passed_in(self):
harness = Harness(
CharmBase,
meta='''
name: test-app
''',
actions='''
test-action:
description: a dummy test action
''')
self.addCleanup(harness.cleanup)
self.assertEqual(list(harness.framework.meta.actions), ['test-action'])
def test_relation_set_deletes(self):
harness = Harness(CharmBase, meta='''
name: test-charm
requires:
db:
interface: pgsql
''')
self.addCleanup(harness.cleanup)
harness.begin()
harness.set_leader(False)
rel_id = harness.add_relation('db', 'postgresql')
harness.update_relation_data(rel_id, 'test-charm/0', {'foo': 'bar'})
harness.add_relation_unit(rel_id, 'postgresql/0')
rel = harness.charm.model.get_relation('db', rel_id)
del rel.data[harness.charm.model.unit]['foo']
self.assertEqual({}, harness.get_relation_data(rel_id, 'test-charm/0'))
def test_set_workload_version(self):
harness = Harness(CharmBase, meta='''
name: app
''')
self.addCleanup(harness.cleanup)
harness.begin()
self.assertIsNone(harness.get_workload_version())
harness.charm.model.unit.set_workload_version('1.2.3')
self.assertEqual(harness.get_workload_version(), '1.2.3')
def test_get_backend_calls(self):
harness = Harness(CharmBase, meta='''
name: test-charm
requires:
db:
interface: pgsql
''')
self.addCleanup(harness.cleanup)
harness.begin()
# No calls to the backend yet
self.assertEqual(harness._get_backend_calls(), [])
rel_id = harness.add_relation('db', 'postgresql')
# update_relation_data ensures the cached data for the relation is wiped
harness.update_relation_data(rel_id, 'test-charm/0', {'foo': 'bar'})
self.assertEqual(
harness._get_backend_calls(reset=True), [
('relation_ids', 'db'),
('relation_list', rel_id),
])
# add_relation_unit resets the relation_list, but doesn't trigger backend calls
harness.add_relation_unit(rel_id, 'postgresql/0')
self.assertEqual([], harness._get_backend_calls(reset=False))
# however, update_relation_data does, because we are preparing relation-changed
harness.update_relation_data(rel_id, 'postgresql/0', {'foo': 'bar'})
self.assertEqual(
harness._get_backend_calls(reset=False), [
('relation_ids', 'db'),
('relation_list', rel_id),
])
# If we check again, they are still there, but now we reset it
self.assertEqual(
harness._get_backend_calls(reset=True), [
('relation_ids', 'db'),
('relation_list', rel_id),
])
# And the calls are gone
self.assertEqual(harness._get_backend_calls(), [])
def test_get_backend_calls_with_kwargs(self):
harness = Harness(CharmBase, meta='''
name: test-charm
requires:
db:
interface: pgsql
''')
self.addCleanup(harness.cleanup)
harness.begin()
unit = harness.charm.model.unit
# Reset the list, because we don't care what it took to get here
harness._get_backend_calls(reset=True)
unit.status = ActiveStatus()
self.assertEqual(
[('status_set', 'active', '', {'is_app': False})], harness._get_backend_calls())
harness.set_leader(True)
app = harness.charm.model.app
harness._get_backend_calls(reset=True)
app.status = ActiveStatus('message')
self.assertEqual(
[('is_leader',),
('status_set', 'active', 'message', {'is_app': True})],
harness._get_backend_calls())
def test_unit_status(self):
harness = Harness(CharmBase, meta='name: test-app')
self.addCleanup(harness.cleanup)
harness.set_leader(True)
harness.begin()
# default status
self.assertEqual(harness.model.unit.status, MaintenanceStatus(''))
status = ActiveStatus('message')
harness.model.unit.status = status
self.assertEqual(harness.model.unit.status, status)
def test_app_status(self):
harness = Harness(CharmBase, meta='name: test-app')
self.addCleanup(harness.cleanup)
harness.set_leader(True)
harness.begin()
# default status
self.assertEqual(harness.model.app.status, UnknownStatus())
status = ActiveStatus('message')
harness.model.app.status = status
self.assertEqual(harness.model.app.status, status)
def test_populate_oci_resources(self):
harness = Harness(CharmBase, meta='''
name: test-app
resources:
image:
type: oci-image
description: "Image to deploy."
image2:
type: oci-image
description: "Another image."
''')
self.addCleanup(harness.cleanup)
harness.populate_oci_resources()
path = harness.model.resources.fetch('image')
self.assertTrue(str(path).endswith('/image/contents.yaml'))
with path.open('r') as resource_file:
contents = yaml.safe_load(resource_file.read())
self.assertEqual(contents['registrypath'], 'registrypath')
self.assertEqual(contents['username'], 'username')
self.assertEqual(contents['password'], 'password')
path = harness.model.resources.fetch('image2')
self.assertTrue(str(path).endswith('/image2/contents.yaml'))
def test_resource_folder_cleanup(self):
harness = Harness(CharmBase, meta='''
name: test-app
resources:
image:
type: oci-image
description: "Image to deploy."
''')
self.addCleanup(harness.cleanup)
harness.populate_oci_resources()
path = harness.model.resources.fetch('image')
self.assertTrue(path.exists())
harness.cleanup()
self.assertFalse(path.exists())
self.assertFalse(path.parent.exists())
self.assertFalse(path.parent.parent.exists())
def test_add_oci_resource_custom(self):
harness = Harness(CharmBase, meta='''
name: test-app
resources:
image:
type: oci-image
description: "Image to deploy."
''')
self.addCleanup(harness.cleanup)
custom = {
"registrypath": "custompath",
"username": "custom_username",
"password": "custom_password",
}
harness.add_oci_resource('image', custom)
resource = harness.model.resources.fetch('image')
with resource.open('r') as resource_file:
contents = yaml.safe_load(resource_file.read())
self.assertEqual(contents['registrypath'], 'custompath')
self.assertEqual(contents['username'], 'custom_username')
self.assertEqual(contents['password'], 'custom_password')
def test_add_oci_resource_no_image(self):
harness = Harness(CharmBase, meta='''
name: test-app
resources:
image:
type: file
description: "Image to deploy."
''')
self.addCleanup(harness.cleanup)
with self.assertRaises(RuntimeError):
harness.add_oci_resource("image")
with self.assertRaises(RuntimeError):
harness.add_oci_resource("missing-resource")
self.assertEqual(len(harness._backend._resources_map), 0)
def test_add_resource_unknown(self):
harness = Harness(CharmBase, meta='''
name: test-app
resources:
image:
type: file
description: "Image to deploy."
''')
self.addCleanup(harness.cleanup)
with self.assertRaises(RuntimeError):
harness.add_resource('unknown', 'content')
def test_add_resource_but_oci(self):
harness = Harness(CharmBase, meta='''
name: test-app
resources:
image:
type: oci-image
description: "Image to deploy."
''')
self.addCleanup(harness.cleanup)
with self.assertRaises(RuntimeError):
harness.add_resource('image', 'content')
def test_add_resource_string(self):
harness = Harness(CharmBase, meta='''
name: test-app
resources:
image:
type: file
filename: foo.txt
description: "Image to deploy."
''')
self.addCleanup(harness.cleanup)
harness.add_resource('image', 'foo contents\n')
path = harness.model.resources.fetch('image')
self.assertTrue(
str(path).endswith('/image/foo.txt'),
msg='expected {} to end with /image/foo.zip')
with path.open('rt') as f:
self.assertEqual('foo contents\n', f.read())
def test_add_resource_bytes(self):
harness = Harness(CharmBase, meta='''
name: test-app
resources:
image:
type: file
filename: foo.zip
description: "Image to deploy."
''')
self.addCleanup(harness.cleanup)
raw_contents = b'\xff\xff\x00blah\n'
harness.add_resource('image', raw_contents)
path = harness.model.resources.fetch('image')
self.assertTrue(
str(path).endswith('/image/foo.zip'),
msg='expected {} to end with /image/foo.zip')
with path.open('rb') as f:
self.assertEqual(raw_contents, f.read())
def test_add_resource_unknown_filename(self):
harness = Harness(CharmBase, meta='''
name: test-app
resources:
image:
type: file
description: "Image to deploy."
''')
self.addCleanup(harness.cleanup)
harness.add_resource('image', 'foo contents\n')
path = harness.model.resources.fetch('image')
self.assertTrue(
str(path).endswith('/image/image'),
msg='expected {} to end with /image/image')
class DBRelationChangedHelper(Object):
def __init__(self, parent, key):
super().__init__(parent, key)
self.changes = []
parent.framework.observe(parent.on.db_relation_changed, self.on_relation_changed)
def on_relation_changed(self, event):
if event.unit is not None:
self.changes.append((event.relation.id, event.unit.name))
else:
self.changes.append((event.relation.id, event.app.name))
class RelationChangedViewer(Object):
"""Track relation_changed events and saves the data seen in the relation bucket."""
def __init__(self, charm, relation_name):
super().__init__(charm, relation_name)
self.changes = []
charm.framework.observe(charm.on[relation_name].relation_changed, self.on_relation_changed)
def on_relation_changed(self, event):
if event.unit is not None:
data = event.relation.data[event.unit]
else:
data = event.relation.data[event.app]
self.changes.append(dict(data))
class RecordingCharm(CharmBase):
"""Record the events that we see, and any associated data."""
def __init__(self, framework):
super().__init__(framework)
self.changes = []
self.framework.observe(self.on.config_changed, self.on_config_changed)
self.framework.observe(self.on.leader_elected, self.on_leader_elected)
def get_changes(self, reset=True):
changes = self.changes
if reset:
self.changes = []
return changes
def on_config_changed(self, _):
self.changes.append(dict(name='config', data=dict(self.framework.model.config)))
def on_leader_elected(self, _):
self.changes.append(dict(name='leader-elected'))
class RelationEventCharm(RecordingCharm):
"""Record events related to relation lifecycles."""
def __init__(self, framework):
super().__init__(framework)
def observe_relation_events(self, relation_name):
self.framework.observe(self.on[relation_name].relation_created, self._on_relation_created)
self.framework.observe(self.on[relation_name].relation_joined, self._on_relation_joined)
self.framework.observe(self.on[relation_name].relation_changed, self._on_relation_changed)
self.framework.observe(self.on[relation_name].relation_departed,
self._on_relation_departed)
self.framework.observe(self.on[relation_name].relation_broken, self._on_relation_broken)
def _on_relation_created(self, event):
self._observe_relation_event('relation-created', event)
def _on_relation_joined(self, event):
self._observe_relation_event('relation-joined', event)
def _on_relation_changed(self, event):
self._observe_relation_event('relation-changed', event)
def _on_relation_departed(self, event):
self._observe_relation_event('relation-departed', event)
def _on_relation_broken(self, event):
self._observe_relation_event('relation-broken', event)
def _observe_relation_event(self, event_name, event):
unit_name = None
if event.unit is not None:
unit_name = event.unit.name
app_name = None
if event.app is not None:
app_name = event.app.name
self.changes.append(
dict(name=event_name,
data=dict(app=app_name, unit=unit_name, relation_id=event.relation.id)))
class TestTestingModelBackend(unittest.TestCase):
def test_status_set_get_unit(self):
harness = Harness(CharmBase, meta='''
name: app
''')
self.addCleanup(harness.cleanup)
backend = harness._backend
backend.status_set('blocked', 'message', is_app=False)
self.assertEqual(
backend.status_get(is_app=False),
{'status': 'blocked', 'message': 'message'})
self.assertEqual(
backend.status_get(is_app=True),