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Merge "Improvement in API Microversion testing doc"

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===================================
How To Implement Microversion Tests
===================================
=================================
Microversion Testing With Tempest
=================================
Tempest provides stable interfaces to test API Microversion.
For Details, see: `API Microversion testing Framework`_
This document explains how to implement Microversion tests using those
interfaces.
Many OpenStack Services provide their APIs with `microversion`_
support and want to test them in Tempest.
.. _API Microversion testing Framework: http://docs.openstack.org/developer/tempest/library/api_microversion_testing.html
.. _microversion: http://specs.openstack.org/openstack/api-wg/guidelines/microversion_specification.html
This document covers how to test microversions for each project and
whether tests should live in Tempest or on project side.
Tempest Scope For Microversion Testing
""""""""""""""""""""""""""""""""""""""
APIs microversions for any OpenStack service grow rapidly and
testing each and every microversion in Tempest is not feasible and
efficient way.
Also not every API microversion changes the complete system behavior
and many of them only change the API or DB layer to accept and return more
data on API.
Tempest is an integration test suite, but not all API microversion testing fall under this category.
As a result, Tempest mainly covers integration test cases for microversions, Other testing coverage
for microversion should be hosted on project side as functional tests or via Tempest plugin as per
project guidelines.
.. note:: Integration tests are those tests which involve more than one service to
verify the expected behavior by single or combination of API requests.
If a test is just to verify the API behavior as success and failure cases
or verify its expected response object, then it does not fall under integration
tests.
Tempest will cover only integration testing of applicable microversions with
below exceptions:
#. Test covers a feature which is important for interoperability. This covers tests requirement
from Defcore.
#. Test needed to fill Schema gaps.
Tempest validates API responses with defined JSON schema. API responses can be different on
each microversion and the JSON schemas need to be defined separately for the microversion.
While implementing new integration tests for a specific microversion, there
may be a gap in the JSON schemas (caused by previous microversions) implemented
in Tempest.
Filling that gap while implementing the new integration test cases is not efficient due to
many reasons:
* Hard to review
* Sync between multiple integration tests patches which try to fill the same schema gap at same
time
* Might delay the microversion change on project side where project team wants Tempest
tests to verify the results.
Tempest will allow to fill the schema gaps at the end of each cycle, or more
often if required.
Schema gap can be filled with testing those with a minimal set of tests. Those
tests might not be integration tests and might be already covered on project
side also.
This exception is needed because:
* Allow to create microversion response schema in Tempest at the same time that projects are
implementing their API microversions. This will make implementation easier for adding
required tests before a new microversion change can be merged in the corresponding project
and hence accelerate the development of microversions.
* New schema must be verified by at least one test case which exercises such schema.
For example:
If any projects implemented 4 API microversion say- v2.3, v2.4, v2.5, v2.6
Assume microversion v2.3, v2.4, v2.6 change the API Response which means Tempest
needs to add JSON schema for v2.3, v2.4, v2.6.
In that case if only 1 or 2 tests can verify all new schemas then we do not need
separate tests for each new schemas. In worst case, we have to add 3 separate tests.
#. Test covers service behavior at large scale with involvement of more deep layer like hypervisor
etc not just API/DB layer. This type of tests will be added case by case basis and
with project team consultation about why it cannot be covered on project side and worth to test
in Tempest.
Project Scope For Microversion Testing
""""""""""""""""""""""""""""""""""""""
All microversions testing which are not covered under Tempest as per above section, should be
tested on project side as functional tests or as Tempest plugin as per project decision.
Configuration options for Microversion
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How To Implement Microversion Tests
"""""""""""""""""""""""""""""""""""
Tempest provides stable interfaces to test API Microversion.
For Details, see: `API Microversion testing Framework`_
This document explains how to implement Microversion tests using those
interfaces.
.. _API Microversion testing Framework: http://docs.openstack.org/developer/tempest/library/api_microversion_testing.html
Step1: Add skip logic based on configured Microversion range
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