BundleTester

A juju-deployer based test runner for bundles and charms.

Installation

pip2 install bundletester

Introduction

This is designed around the fail fast principle. Each bundle is composed of charms, each of those charms should have tests ranging from unit tests to integration tests. The bundle itself will have integration tests. Those tests should run from least expensive to most expensive in terms of time, failing as soon as possible. The theory is that if tests fail in the charms, the bundle cannot function. Bundletester will therefore pull all the charms and look for any tests it can find and run those prior running its own integration tests.

This test runner uses the following pattern. A bundle has a URL. The runner can be run directly from within a bundle checkout or will pull the branch to which the bundle url refers. From there it will attempt to look for a 'tests' directory off the project root. Using the rules described below it will find and execute each test within that directory and produce a report.

This also includes a bundlewatcher script which can be used as a Jenkins script trigger.

Example Usage

From within the top level of a bundle or charm:

bundletester -r json -o result.json

Using a specific bundle or charm directory:

bundletester -t ~/charms/trusty/mycharm -l DEBUG

Passing -l/--log-level DEBUG will give additional insight into what steps bundletester is taking.

Remote Sources

bundletester can fetch and run tests from remote locations:

bundletester -t cs:trusty/wordpress

The -t option accepts a variety of URL types:

Charm Store

-t cs:wordpress
-t cs:precise/wordpress
-t bundle:mediawiki-single
-t bundle:mediawiki-single-8
-t bundle:~charmers/mediawiki-single
-t bundle:~charmers/mediawiki-single-8

Launchpad

-t lp:~charmers/charms/precise/ghost/trunk
-t launchpad:~charmers/charms/precise/ghost/trunk
-t https://launchpad.net/~charmers/charms/precise/ghost/trunk

# Add '@revision' to any Launchpad URL to test a specific revision
-t lp:~charmers/charms/precise/ghost/trunk@4

# Test charm or bundle merge proposal
-t lp:~davidpbritton/charms/precise/apache2/avoid-regen-cert/+merge/221102

Github

-t gh:charms/apache2
-t github:charms/apache2
-t https://github.com/charms/apache2

# Add '@revision' to any Github URL to test a specific revision
-t https://github.com/charms/apache2@52e73d

Bitbucket

# For Bitbucket, repos that don't end in '.git' are assumed to be Hg
-t bb:battlemidget/juju-apache-gunicorn-django.git
-t bitbucket:battlemidget/juju-apache-gunicorn-django.git
-t https://bitbucket.org/battlemidget/juju-apache-gunicorn-django.git

# Add '@revision' to any Bitbucket URL to test a specific revision
-t bb:battlemidget/juju-apache-gunicorn-django.git@daff5d9

Test Directory

The driver file tests/tests.yaml is used (by default) to control the overall flow of how tests work. All values in this file (and indeed the file itself) are optional. When not provided, defaults will be used.

You can override the tests/tests.yaml file in a charm or bundle by using the -y argument to bundletester, e.g.:

bundletester -t cs:meteor -y /path/to/custom/tests.yaml

tests.yaml

A sample tests.yaml file::

bootstrap: false
reset: false
virtualenv: true
virtualenv_python: python3
tests: "[0-9]*"
excludes:
  - `charm-name`
sources:
  - ppa:ubuntu-lxc/lxd-stable
packages:
  - lxd
python_packages:
  - bzr
  - juju-deployer
  - amulet
  - requests
requirements:
  - test-requirements.txt
  - requirements.txt
makefile:
  - lint
  - test
setup: `filename`
teardown: `filename`
bundle_deploy: false
deployment_timeout: 2700

Explanation of keys:

bootstrap: Bootstrap the environment if necessary (default: true).

reset: Use juju-deployer to reset the model between each test file execution (default: true).

reset_timeout: Max time (in seconds) allowed for each of two routines in a model reset: machine termination, and application removal. Total wait time can be 2X this value. This option has no effect if reset has any value other than true (default: 180).

virtualenv: Create and activate a virtualenv in which all tests are run (default: false).

virtualenv_python: The version of python with which to create the virtualenv (if virtualenv is `true'). Examples: python, python2.7, python3.5 (default: python).

tests: A glob pattern of executable files in the tests/ directory to treat as tests (default: "*"). Only files that match this pattern will be executed.

excludes: List of charm names for which tests should be skipped. Useful if executing against a bundle.

sources: List of apt package sources to add before installing packages.

packages: List of packages to install with apt before running tests.

python_packages: List of python packages to install with pip install -U before running tests. If virtualenv is true, the packages will be installed in the virtualenv.

requirements: List of pip requirements file names (relative to the charm or bundle root dir), which will be passed to pip install -r. If virtualenv is true, the packages will be installed in the virtualenv, otherwise they will be installed at the system level. (default: [])

makefile: List of make targets to execute (default: [lint, test]).

setup: Optional name of a script in the tests/ directory to run before each test.

teardown: Optional name of script in the tests/ directory to run after each test.

bundle_deploy: Only applies when testing a bundle. Acceptable values are true, false, or a file name. If true (the default), the bundle will be deployed by juju-deployer before any tests are run. If false, the deployment step will be skipped. If a filename is given, it should be an executable file in the tests/ directory (likely an amulet script). The file will be executed as the deployment step. Useful if you want to deploy the bundle, but need to modify it first. Note that if the bundle_deploy filename matches the tests glob pattern, it will be executed twice - once in the deploy step, and once as a test. To prevent this, use a tests glob pattern that doesn't match the bundle_deploy file name.

deployment_timeout: Max time (in seconds) allowed for the initial bundle deploy (before any tests are run). This option has no effect if bundle_deploy has any value other than true (default: 2700).

Finding Tests

When tests.yaml's test pattern is executed it will yield a test which should be run. Each of these test files can optionally have a control file of the same name but with a .yaml extension. If present, this file has a similar layout to tests.yaml.

A sample 01-test.yaml file::

bundle: bundle.yaml
setup: script
teardown: script

Explanation of keys:

bundle: A bundle file name, relative to the tests directory. If bundle isn't specified <BUNDLE_ROOT>/bundle.yaml will be used by default.

setup: An optional script to be run before this test. This is called after the tests.yaml setup, if present.

teardown: An optional script to be run after this test. This is called before the tests.yaml teardown, if present.

Setup/Teardown

If these scripts fail with a non-zero exit code, the test will be recorded as a failure with that exit code.

Test Execution

Each test should be executable. If virtualenv is true, each test will be executed with that environment activated.

Each test will have its stdout and stderr captured.

Each test's exit code will be captured. A non-zero return indicates failure.

Reporting Results

Any test failures will result in a non-zero exit code.

Using -r json a JSON string will be printed on stdout. This string will contain, at minimum, the following structure (additional keys are possible):

[{test result}, ...]

each test result is a dict with at least:

{'test': test file, result: exit_code,
  'exit': 'script name which returned exit code',
  'returncode': exitcode of process,
  'duration': timedelta in seconds}

exit will not be included if result is sucess (0)