Skip to main content

Your submission was sent successfully! Close

Thank you for signing up for our newsletter!
In these regular emails you will find the latest updates from Canonical and upcoming events where you can meet our team.Close

Thank you for contacting us. A member of our team will be in touch shortly. Close

Note: All commands are written for juju >= v.3.1

If you’re using juju 2.9, check the juju 3.0 Release Notes.

Software testing for charms

Most types of standard software tests are applicable to Charmed PostgreSQL.

This reference addresses the following types:

Smoke test

This type of test ensures that basic functionality works over a short amount of time.

Steps

  1. Set up a juju v.3.x environment
  2. Deploy database with test application
  3. Start “continuous write” test
Example 
juju add-model smoke-test

juju deploy postgresql-k8s --trust --channel 14/edge
juju scale-application postgresql-k8s 3 # (optional)

juju deploy postgresql-test-app
juju integrate postgresql-test-app:first-database postgresql-k8s

# Start "continuous write" test:
juju run postgresql-test-app/leader start-continuous-writes

export user=operator
export pass=$(juju run postgresql-k8s/leader get-password username=${user} | yq '.. | select(. | has("password")).password')
export relname=first-database
export ip=$(juju show-unit postgresql-k8s/0 --endpoint database | yq '.. | select(. | has("public-address")).public-address')
export db=$(juju show-unit postgresql-k8s/0 --endpoint database | yq '.. | select(. | has("database")).database')
export relid=$(juju show-unit postgresql-k8s/0 --endpoint database | yq '.. | select(. | has("relation-id")).relation-id')
export query="select count(*) from continuous_writes"

watch -n1 -x juju run postgresql-test-app/leader run-sql dbname=${db} query="${query}" relation-id=${relid} relation-name=${relname}

# OR

watch -n1 -x juju ssh --container postgresql postgresql-k8s/leader "psql postgresql://${user}:${pass}@${ip}:5432/${db} -c \"${query}\""

# Watch that the counter is growing!

Expected results

  • postgresql-test-app continuously inserts records into the database received through the integration (the table continuous_writes).
  • The counters (amount of records in table) are growing on all cluster members

Tips

To stop the “continuous write” test, run

juju run postgresql-test-app/leader stop-continuous-writes

To truncate the “continuous write” table (i.e. delete all records from database), run

juju run postgresql-test-app/leader clear-continuous-writes

Unit test

Check the Contributing guide on GitHub and follow tox run -e unit examples there.

Integration test

Check the Contributing guide on GitHub and follow tox run -e integration examples there.

System test

To perform a system test, deploy postgresql-k8s-bundle. This charm bundle automatically deploys and tests all the necessary parts at once.

Previous System requirements Next Performance and resources

Last updated 5 months ago. Help improve this document in the forum.