103 lines
5.1 KiB
Markdown
103 lines
5.1 KiB
Markdown
# Shippable Scripts
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## Scripts
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This directory contains the following scripts:
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- download.py - Download results from Shippable.
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- get_recent_coverage_runs.py - Retrieve Shippable URLs of recent coverage test runs.
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- incidental.py - Report on incidental code coverage using data from Shippable.
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- run.py - Start new runs on Shippable.
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## Incidental Code Coverage
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### Background
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Incidental testing and code coverage occurs when a test covers one or more portions of code as an unintentional side-effect of testing another portion of code.
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For example, the ``yum`` integration test intentionally tests the ``yum`` Ansible module.
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However, in doing so it also uses, and unintentionally tests the ``file`` module as well.
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As part of the process of migrating modules and plugins into collections, integration tests were identified that provided exclusive incidental code coverage.
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That is, tests which would be migrated out of the repository which covered code which would not be covered by any remaining tests.
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These integration test targets were preserved as incidental tests with the ``incidental_`` prefix prior to migration.
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The plugins necessary to support these tests were also preserved in the ``test/support/`` directory.
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The long-term goal for these incidental tests is to replace them with tests that intentionally cover the relevant code.
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As additional intentional tests are added, the exclusive coverage provided by incidental tests will decline, permitting them to be removed without loss of test coverage.
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### Reducing Incidental Coverage
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Reducing incidental test coverage, and eventually removing incidental tests involves the following process:
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1. Run the entire test suite with code coverage enabled.
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This is done automatically each day on Shippable.
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The URLs and statuses of the most recent such test runs can be found with:
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```shell
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hacking/shippable/get_recent_coverage_runs.py <optional branch name>
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```
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For now the branch name defaults to `temp-2.10-devel`.
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2. Download code coverage data from Shippable for local analysis.
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Example:
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```shell
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# download results to ansible/ansible directory under cwd
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# substitute the correct run number for the Shippable coverage run you want to download
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hacking/shippable/download.py https://app.shippable.com/github/ansible/ansible/runs/162160 --all -v
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```
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3. Analyze code coverage data to see which portions of the code are covered by each test.
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Example:
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```shell script
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# make sure ansible-test is in $PATH
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source hacking/env-setup
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# run the script using whichever directory results were downloaded into
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hacking/shippable/incidental.py ansible/ansible/162160
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```
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4. Create new intentional tests, or extend existing ones, to cover code that is currently covered by incidental tests.
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Reports are created by default in a ``test/results/.tmp/incidental/{hash}/reports/`` directory.
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The ``{hash}`` value is based on the input files used to generate the report.
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Over time, as the above process is repeated, exclusive incidental code coverage will decline.
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When incidental tests no longer provide exclusive coverage they can be removed.
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> CAUTION: Only one incidental test should be removed at a time, as doing so may cause another test to gain exclusive incidental coverage.
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### Reading Incidental Coverage Reports
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Each line of code covered will be included in a report.
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The left column contains the line number where the source occurs.
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If the coverage is for Python code a comment on the right side will indicate the coverage arcs involved.
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Below is an example of a report:
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```
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Target: incidental_win_psexec
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GitHub: https://github.com/ansible/ansible/blob/6994ef0b554a816f02e0771cb14341a421f7cead/test/integration/targets/incidental_win_psexec
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Source: lib/ansible/executor/task_executor.py (2 arcs, 3/1141 lines):
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GitHub: https://github.com/ansible/ansible/blob/6994ef0b554a816f02e0771cb14341a421f7cead/lib/ansible/executor/task_executor.py
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705 if 'rc' in result and result['rc'] not in [0, "0"]: ### (here) -> 706
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706 result['failed'] = True ### 705 -> (here) ### (here) -> 711
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711 if self._task.until: ### 706 -> (here)
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```
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The report indicates the test target responsible for the coverage and provides a link to the source on GitHub using the appropriate commit to match the code coverage.
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Each file covered in the report indicates the lines affected, and in the case of Python code, arcs.
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A link to the source file on GitHub using the appropriate commit is also included.
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The left column includes the line number for the source code found to the right.
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In the case of Python files, the rightmost comment indicates the coverage arcs involved.
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``### (here) -> 706`` for source line 705 indicates that execution flowed from line 705 to line 706.
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Multiple outbound line numbers can be present.
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``### 706 -> (here)`` for source line 711 indicates that execution flowed from line 706 to line 711.
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Multiple inbound line numbers can be present.
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In both cases ``(here)`` is simply a reference to the current source line.
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Arcs are only available for Python code.
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PowerShell code only reports covered line numbers.
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