Move scenario tests to a separate repository

Move scenario tests to a separate repository

https://blueprints.launchpad.net/sahara/+spec/move-scenario-tests-to-separate-repo

Scenario tests represent an independent framework for testing Sahara. Moving scenario tests to a separate repository will make testing Sahara stable releases more comfortable. The migration should be done in a way that there will be no need to pre-configure the CI or any other external tool, just install the scenario framework and start the tests.

Problem description

There are 2 issues to be solved: 1. It is difficult to package tests independently from Sahara. 2. It is impossible to release those tests independently.

Proposed change

First it’s proposed to implement a method for the correct tests installation. Next a new repository should be created and all Sahara scenario tests should be moved to that repository. After that all sahara-ci jobs should be migrated to the new mechanism of running scenario tests.

The scenario framework itself should be improved to be able to correctly skip tests for the features that are not available in earlier Sahara releases. Testing stable/kilo and stable/liberty branches may require some updates to appropriate scenarios. The CI should initially start running scenario tests for stable/kilo and stable/liberty and keep testing 2 latest stable releases.

Having a separate repository allows using these tests as a plugin for Sahara (like client tests for tempest, without releases). Perhaps, scenario tests will be installed in a virtualenv.

The scenario framework and tests themselves may be packaged and released. All requirements should then be installed to the current operating system. This however implies that scenario framework dependencies should be packaged and installed as well. Many of these requirements are not packaged neither in MOS nor in RDO.

There are 2 ways to solve this: 1. Manual update of requirements to keep them compatible with 2 previous stable releases 2. Move all changing dependencies from requirements to test-requirements

Yaml-files defining the scenarios are a part of the test framework and they should be moved to the new repository with scenario tests.

Next step is to add support of default templates for every plugin in each stable release with correct flavors, node processes. For example, list of plugins for the 2 previous stable releases:

  • kilo: vanilla 2.6.0, cdh 5.3.0, mapr 4.0.2, spark 1.0.0, ambari 2.2/2.3
  • liberty: vanilla 2.7.1, cdh 5.4.0, mapr 5.0.0, spark 1.3.1, ambari 2.2/2.3

Each default template for should be implemented as yaml file which will be run on CI.

Alternatives

Alternative would be to package the tests for easier installation and usage. For example, command for running tests for vanilla 2.7.1 plugin will be:

$ sahara_tests -p vanilla -v 2.7.1

Data model impact

None

REST API impact

None

Other end user impact

None

Deployer impact

Deployers should switch CI to use the new repository with scenario tests instead of current Sahara repository.

Developer impact

None

Sahara-image-elements impact

None

Sahara-dashboard / Horizon impact

None

Implementation

Assignee(s)

Primary assignee:
esikachev

Work Items

This will require following changes:

  • Implement installation mechanism for tests.
  • Move tests to separate repository (with scenario_unit tests).
  • Update sahara-ci jobs for new scenario tests repository.
  • Add default templates for each plugin and release.
  • Update scenario framework for correct testing of previous releases.
  • Add new jobs on sahara-ci for testing Sahara on previous releases.
  • Add ability for tests packaging.

Dependencies

None

Testing

None

Documentation Impact

Need to add documentation with description “How to run Sahara scenario tests”.

References

None

Creative Commons Attribution 3.0 License

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sahara-specs 0.0.1.dev337