dpb1 / charm-fixtures

A Python fixture for creating fake juju hook tools, intended for charm unit testing.

Overview

Python fixtures for faking out the boundaries of a Juju charm and allow convenient unit-testing.

The boundaries are typically executables (e.g. Juju hook tools), network and file system.

Example

The CharmTest base class sets up all available charm fixtures, so you can for example programmatically modify backend juju data that hook tools will return, create fake system users or groups, etc.

from charmfixtures import CharmTest

from charmhelpers.core import hookenv


class MyCharmTest(CharmTest):

    def test_log(self):
        """Inspect log lines emitted by your charm code."""
        hookenv.log("Hello world!")
        self.assertEqual("INFO: Hello world!", self.unit.log[0])

    def test_config(self):
        """Set config values for your charm code."""
        self.application.config["foo"] = "bar"
        self.assertEqual("bar", hookenv.config()["foo"])