# Integration/Functional tests¶

This is probably the most important part of testing.

When you submit your module, you must submit functional tests, so that you and F5 can agree that a module works on a particular platform.

When you submit a new PR, F5 will test your module on a variety of versions automatically, and will provide feedback if issues exist.

## Structure of tests¶

When you stub a new module, test file stubs are automatically created. There are several parts to these stubs, and ultimately to the integration tests. All integration tests are composed of plain-old Ansible features and components.

• A Playbook
• A Role
• Files
• Templates
• Inventory

### The playbook¶

All integration tests begin their life in the Playbook. The Playbook used by the tests is a regular Playbook that you might find in regular Ansible deployments. For the module being developed, here is the Playbook that is used.

As might be expected, this Playbook has all the components of a “normal” Playbook. It specifies hosts, has a name, declares variables, and includes a Role.

The Playbook and its contents are shown below.

- name: Test the bigip_policy_rule module
hosts: "f5-test[0]"
connection: local
any_errors_fatal: true

vars:
limit_to: '*'
version: 1.0
tested_platforms:
- NA
callgraph_exclude:
- pycallgraph.*

# Ansible related
- ansible.module_utils.basic.AnsibleModule.*
- ansible.module_utils.basic.*
- ansible.module_utils.parsing.*
- ansible.module_utils._text.*
- ansible.module_utils.six.*

environment:
F5_SERVER: "{{ ansible_host }}"
F5_SERVER_PORT: "{{ bigip_port }}"
F5_VALIDATE_CERTS: "{{ validate_certs }}"

roles:
- bigip_policy_rule


Because most of this is a normal Playbook, this tutorial will just cover the parts that are interesting.

The first interesting bit is the large vars section. Frankly speaking, this can be ignored by most contributors as it is not something that is used by the functional tests directly. Its purpose is to provide metadata to the module developers for use in tracking testing and things.

Variable Purpose
limit_to
• Not currently used
• In the future, this var may allow you to select the tests that you want to run.
__metadata__
• Special variable used by F5 only to track F5-specific interests.
• Playbook metadata versions are described more in this document.

The environment section is also interesting in the context of the F5 modules. The modules support specifying common connection parameters in the environment like this so that you do not need to specify them in each task. To keep the size of the tasks small, the developers use this method.

### The role¶

The Role contains all of the tests that will be run as part of the integration test suite. Roles are written, and use all the same conventions, that normal Ansible Roles use.

Roles for integration tests can be found in the targets directory, right alongside the test Playbook. Inside this directory are sub-directories. Each is named after the module under test.

For the purposes of this tutorial, the Role directory can be found here.

This role has everything you would associate with a normal role in Ansible.

• If your test requires static files, then a files/ directory should be in your role.
• If your test requires template data (for example, iRules) for its input, then a templates/ directory should be in your role.
• All roles will perform some work to test the module, so a tasks/ directory should be in your role.

When Ansible executes a role, it calls one file and one file only. That file is:

• tasks/main.yaml

All integration tests will originate from this file.

Additional files that are commonly found in the tasks/ directory alongside the main.yaml file include:

• setup.yaml
• teardown.yaml

These files, as their names suggest, are used for setting up the integration tests that will run, and tearing down the integration tests that have run, respectively.

Now let’s dig in to what a test should look like.

## Test content¶

The implementation for the functional tests related to the module being developed in this tutorial can be found here.

The test itself will follow the pattern below.

• Perform some operation with the module
• Assert a change (and optionally other values)
• Perform the same operation again (identical)
• Assert no change

All of the tests work like this, and it is a decent smoke test for all modules.

Here is an example of a test from the module under development in this tutorial.

- name: Create rule for published policy, no actions, no conditions
bigip_policy_rule:
policy: "{{ policy_name1 }}"
name: rule1
register: result

- name: Assert Create rule for published policy, no actions, no conditions
assert:
that:
- result is changed

- name: Create rule for published policy, no actions, no conditions - Idempotent check
bigip_policy_rule:
policy: "{{ policy_name1 }}"
name: rule1
register: result

- name: Assert Create rule for published policy, no actions, no conditions - Idempotent check
assert:
that:
- result is not changed


All tests that change data should include a subsequent test that tries to perform the same test, but whose result you do not expect to change.

These are idempotent tests because they ensure that the module only changes settings if needed.

Note

The test code itself is identical to the previous test. The test name includes the string "- Idempotent check". This gives reviewers the ability to visually note that this is an idempotent test. Additionally, it allows them to call out this specific test if running the Playbook with the --start-at-task argument.

The assertion checks that the result has not changed. This is the important part, because it ensures that the test itself was idempotent.

## Test variables¶

Information specific to the tests that you need to run should be in the defaults/main.yaml file of your test role.

By putting them there, you allow individuals to override values in your test by providing arguments to the CLI at runtime.

## Calling the test¶

Tests are run in two ways.

• Use a make command
• Run the playbook directly

The methods have different pros and cons depending on your objective. For those concerned with developing modules, you will likely prefer the latter method: running playbooks directly.

Method Pros Cons
make command
• Not a lot to type
• Commands available for all modules
• Useful when verifying an otherwise known good test
• No debug output
• No ability to step through tests
• No ability to start at specific tests
Run Playbook
• Supports all Ansible commands
• Supports skipping
• Supports debug
• Supports stepping
• Supports specifying overriding arguments
• Supports tag selection
• Requires more typing
• Requires knowledge of Ansible commands

Since this tutorial is interested in development of a module, it will use the “Run Playbook” method.

To run the tests without make, first, change to the following directory:

• test/integration

Next, find the playbook that matches the module you wish to test. Using this playbook, run ansible-playbook as you normally would. A hosts file is provided in the inventory directory.

An example command might be:

ansible-playbook -i inventory/hosts bigip_policy_rule.yaml -vvvv --step


This is the most flexible option during debugging, and it is the recommended way to test the modules.

## Including supplementary information¶

If you include files inside of the files/, templates, or other directories in which the content of that file was auto-generated or pulled from a third party source, you should include a README.md file in your role’s directory.

In this file, you can include steps to reproduce any of the input items that you include in the role subdirectories.

In addition, this is a good location to include references to third-party file locations if you have included them in the tests. For example, if you were to include iRules or other things that you downloaded and included from DevCentral or similar.

The README.md is there for future developers to reference the information needed to re-create any of the inputs to your tests.

## Other testing notes¶

When writing your tests, you should concern yourself with “undoing” what you have done previously to the test environment.

The test environment boots harnesses for each suite of tests. This means that all tests run on the same harness. Therefore, someone might accidentally use changes you made in one of the integration tests as a basis for subsequent tests. This makes using the ansible-playbook previously mentioned arguments (--step, --start-at-task, --tags, etc.) much more difficult.

Therefore, please clean up after yourself. Since you need to test the absent case in most cases, this is a good opportunity to do that. The teardown.yaml file can also be used to teardown any resources that were created to assist in testing your module.

## Conclusion¶

If you’ve made it this far, then give yourself a pat on the back. This officially concludes the mainline tutorial concerning module development. At this point you should be much more familiar with the parts that make up a module, as well as the assortment of supporting files for the module.

Feel free to peruse the other development-related docs on the site, and keep an eye out for future documents that detail more technical methods for development. Finally, since the process of module development (and the conventions that are used) are continually changing, be sure to frequently refer back to these pages for updates to your existing knowledge.