Initiate Developer guide (Testing group)

We started building several xProjects enablers
The goal of this document will be to help developers
- to know/use the different tools
- to take into account the recommendations
- to get the links for support

Change-Id: I49af8525514437d07390b5d098abebe75a80c0b1
Signed-off-by: Morgan Richomme <morgan.richomme@orange.com>

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+.. This work is licensed under a Creative Commons Attribution 4.0 International License.
+.. SPDX-License-Identifier: CC-BY-4.0
+
+*********************
+Test developer guide
+*********************
+
+.. toctree::
+   :numbered:
+   :maxdepth: 2
+
+
+============
+Introduction
+============
+
+The OPNFV testing ecosystem is wide.
+
+The goal of this guide consists in providing some guidelines for new developers
+involved in test areas.
+
+For the description of the ecosystem, see `[1]`_.
+
+
+=================
+Developer journey
+=================
+
+Be involved in the testing group
+================================
+
+Best practices
+==============
+
+Unit tests
+----------
+
+Dockerization
+-------------
+
+API
+---
+
+CLI
+---
+
+Traffic generators
+------------------
+
+Towards a pseudo micro services approach
+----------------------------------------
+
+======================================
+Testing group configuration parameters
+======================================
+
+
+Testing categories
+==================
+
+The testing group defined several categories also known as tiers. These
+categories can be used to group test suites.
+
++----------------+-------------------------------------------------------------+
+| healthcheck    | Simple and quick healthcheck tests case                     |
++----------------+-------------------------------------------------------------+
+| Smoke          | Set of smoke test cases/suites to validate the release      |
++----------------+-------------------------------------------------------------+
+| Features       | Test cases that validate a specific feature on top of OPNFV.|
+|                | Those come from Feature projects and need a bit of support  |
+|                | for integration                                             |
++----------------+-------------------------------------------------------------+
+| Components     | Tests on a specific component (e.g. OpenStack, OVS, DPDK,..)|
+|                | It may extend smoke tests                                   |
++----------------+-------------------------------------------------------------+
+| Performance    | Performance qualification                                   |
++----------------+-------------------------------------------------------------+
+| VNF            | Test cases related to deploy an open source VNF including   |
+|                | an orchestrator                                             |
++----------------+-------------------------------------------------------------+
+| Stress         | Stress and robustness tests                                 |
++----------------+-------------------------------------------------------------+
+| In Service     | In service testing                                          |
++----------------+-------------------------------------------------------------+
+
+Testing domains
+===============
+
+The domains deal with the technical scope of the tests. It shall correspond to
+domains defined for the certification program:
+
+ * compute
+ * network
+ * storage
+ * hypervisor
+ * container
+ * vim
+ * mano
+ * vnf
+ * ...
+
+Testing coverage
+=================
+One of the goals of the testing working group is to identify the poorly covered
+areas and avoid testing overlap.
+Ideally based on the declaration of the test cases, through the tags, domains
+and tier fields, it shall be possible to create heuristic maps.
+
+
+==============================
+Testing group generic enablers
+==============================
+
+
+TestAPI framework
+=================
+
+The OPNFV testing group created a test collection database to collect
+the test results from CI:
+
+
+ http://testresults.opnfv.org/test/swagger/spec.html
+
+Any test project running on any lab integrated in CI can push the
+results to this database.
+This database can be used to see the evolution of the tests and compare
+the results versus the installers, the scenarios or the labs.
+It is used to produce a dashboard with the current test status of the project.
+
+
+Overall Architecture
+--------------------
+The Test result management can be summarized as follows::
+
+  +-------------+    +-------------+    +-------------+
+  |             |    |             |    |             |
+  |   Test      |    |   Test      |    |   Test      |
+  | Project #1  |    | Project #2  |    | Project #N  |
+  |             |    |             |    |             |
+  +-------------+    +-------------+    +-------------+
+           |               |               |
+           V               V               V
+       +-----------------------------------------+
+       |                                         |
+       |         Test Rest API front end         |
+       |                                         |
+       +-----------------------------------------+
+           A                |
+           |                V
+           |     +-------------------------+
+           |     |                         |
+           |     |    Test Results DB      |
+           |     |         Mongo DB        |
+           |     |                         |
+           |     +-------------------------+
+           |
+           |
+     +----------------------+
+     |                      |
+     |    test Dashboard    |
+     |                      |
+     +----------------------+
+
+TestAPI description
+-------------------
+The TestAPI is used to declare pods, projects, test cases and test
+results. Pods are the sets of bare metal or virtual servers and networking
+equipments used to run the tests.
+
+The results pushed in the database are related to pods, projects and test cases.
+If you try to push results of test done on non referenced pod, the API will
+return an error message.
+
+An additional method dashboard has been added to post-process
+the raw results in release Brahmaputra (deprecated in Colorado).
+
+The data model is very basic, 5 objects are created:
+
+  * Pods
+  * Projects
+  * Testcases
+  * Results
+  * Scenarios
+
+The code of the API is hosted in the releng repository `[6]`_.
+The static documentation of the API can be found at `[7]`_.
+The TestAPI has been dockerized and may be installed locally in your
+lab. See `[15]`_ for details.
+
+The deployment of the TestAPI has been automated.
+A jenkins job manages:
+
+  * the unit tests of the TestAPI
+  * the creation of a new docker file
+  * the deployment of the new TestAPI
+  * the archive of the old TestAPI
+  * the backup of the Mongo DB
+
+TestAPI Authorization
+~~~~~~~~~~~~~~~~~~~~~
+
+PUT/DELETE/POST operations of the TestAPI now require token based authorization. The token needs
+to be added in the request using a header 'X-Auth-Token' for access to the database.
+
+e.g::
+    headers['X-Auth-Token']
+
+The value of the header i.e the token can be accessed in the jenkins environment variable
+*TestApiToken*. The token value is added as a masked password.
+
+.. code-block:: python
+
+    headers['X-Auth-Token'] = os.environ.get('TestApiToken')
+
+The above example is in Python. Token based authentication has been added so that only ci pods
+jenkins job can have access to the database.
+
+Please note that currently token authorization is implemented but is not yet enabled.
+
+Reporting
+=========
+
+An automatic reporting page has been created in order to provide a
+consistent view of the scenarios.
+
+In this page, each scenario is evaluated according to test criteria.
+The code for the automatic reporting is available at `[8]`_.
+
+The results are collected from the centralized database every day and,
+per scenario. A score is calculated based on the results from the last
+10 days.
+
+Dashboard
+=========
+
+Dashboard is used to provide a consistent view of the results collected in CI.
+The results showed on the dashboard are post processed from the Database,
+which only contains raw results.
+
+It can be used in addition of the reporting page (high level view) to allow
+the creation of specific graphs according to what the test owner wants to show.
+
+In Brahmaputra, a basic home made dashboard was created in Functest.
+In Colorado, Yardstick adopted Grafana (time based graphs) and ELK (complex
+graphs).
+Since Danube, the testing community decided to adopt ELK framework and to rely
+on bitergia. It was not implemented for Danube but it is planned for Euphrates.
+
+Bitergia already provides a dashboard for code and infrastructure.
+A new Test tab will be added. The dataset will be built by consuming
+the TestAPI.
+
+See `[3]`_ for details.
+
+
+=======
+How TOs
+=======
+
+Where can I find information on the different test projects?
+===========================================================
+
+
+How can I contribute to a test project?
+=======================================
+
+
+Where can I find hardware resources?
+====================================
+
+
+How do I integrate my tests in CI?
+==================================
+
+
+How to declare my tests in the test Database?
+=============================================
+
+
+How to push your results into the Test Database?
+================================================
+
+The test database is used to collect test results. By default it is
+enabled only for CI tests from Production CI pods.
+
+Please note that it is possible to create your own local database.
+
+A dedicated database is for instance created for each plugfest.
+
+The architecture and associated API is described in previous chapter.
+If you want to push your results from CI, you just have to call the API
+at the end of your script.
+
+You can also reuse a python function defined in functest_utils.py `[5]`_
+
+
+Where can I find the documentation on the test API?
+===================================================
+
+http://artifacts.opnfv.org/releng/docs/testapi.html
+
+
+
+I have tests, to which category should I declare them?
+======================================================
+
+
+
+The main ambiguity could be between features and VNF.
+In fact sometimes you have to spawn VMs to demonstrate the capabilities of the
+feature you introduced.
+We recommend to declare your test in the feature category.
+
+VNF category is really dedicated to test including:
+
+ * creation of resources
+ * deployement of an orchestrator/VNFM
+ * deployment of the VNF
+ * test of the VNFM
+ * free resources
+
+The goal is not to study a particular feature on the infrastructure but to have
+a whole end to end test of a VNF automatically deployed in CI.
+Moreover VNF are run in weekly jobs (one a week), feature tests are in daily
+jobs and use to get a scenario score.
+
+Where are the logs of CI runs?
+==============================
+
+Logs and configuration files can be pushed to artifact server from the CI under
+http://artifacts.opnfv.org/<project name>
+
+
+==========
+References
+==========
+
+_`[1]`: http://docs.opnfv.org/en/stable-danube/testing/ecosystem/overview.html
+
+_`[2]`: http://www.opnfv.org
+
+_`[3]`: https://wiki.opnfv.org/display/testing/Result+alignment+for+ELK+post-processing
+
+_`[4]`: https://wiki.opnfv.org/display/INF/CI+Scenario+Naming
+
+_`[5]`: https://git.opnfv.org/functest/tree/functest/utils/functest_utils.py#176
+
+_`[6]`: https://git.opnfv.org/functest/tree/releng
+
+_`[7]`: http://artifacts.opnfv.org/releng/docs/testapi.html
+
+
+IRC support chan: #opnfv-testperf