mirror of
https://gitlab.gnome.org/GNOME/glib.git
synced 2024-12-27 07:56:14 +01:00
72 lines
4.1 KiB
Markdown
72 lines
4.1 KiB
Markdown
|
Testing policy
|
|||
|
|
===
|
|||
|
|
|
|||
|
|
Aims
|
|||
|
|
---
|
|||
|
|
|
|||
|
|
* Maintainers should be able to make a release of GLib at any time, confident
|
|||
|
|
that it will not contain regressions or obvious bugs with new functionality
|
|||
|
|
* Speed up review of submitted changes by deferring some of the review effort
|
|||
|
|
to automated testing
|
|||
|
|
* Allow fast detection of bugs in new or changed code, particularly if they are
|
|||
|
|
only present on platforms not regularly used by the maintainers
|
|||
|
|
* Allow easy dynamic and static analysis of a significant proportion of the
|
|||
|
|
GLib code
|
|||
|
|
* Statistics on tests (such as pass/failure) should be easily and mechanically
|
|||
|
|
collectable to allow analysis and highlight problems
|
|||
|
|
* Code for tests and code for production should be easily separable so that
|
|||
|
|
statistics on them can be grouped separately
|
|||
|
|
* Performance measurement tools for GLib should be reusable over time to allow
|
|||
|
|
comparable measurements to be collected and to discourage use of lower
|
|||
|
|
quality and throwaway tests when prototyping improvements to GLib
|
|||
|
|
|
|||
|
|
Policy
|
|||
|
|
---
|
|||
|
|
|
|||
|
|
* Tests must be written for all new code, and any existing code which is being
|
|||
|
|
non-trivially modified (for example to fix a bug), to give confidence to the
|
|||
|
|
author and reviewer of the changes that they are correct for all platforms
|
|||
|
|
that GLib runs CI on.
|
|||
|
|
* Tests live in the `{glib,gobject,gio}/tests` directories. This allows their
|
|||
|
|
code to be counted separately when analysing statistics such as code
|
|||
|
|
coverage.
|
|||
|
|
- Performance tests live in `{glib,gobject,gio}/tests/performance`, as they
|
|||
|
|
are executed and results interpreted differently due to giving a result on
|
|||
|
|
a continuous scale rather than a pass/fail result.
|
|||
|
|
* All tests must use the GTest framework, as it supports
|
|||
|
|
[structured output](https://testanything.org/) which exposes test results to
|
|||
|
|
the test runner for analysis.
|
|||
|
|
- Use `g_test_bug()` and `g_test_summary()` in unit tests to link them to
|
|||
|
|
contextual information in bug reports, and to provide a summary of what
|
|||
|
|
each test checks and how it goes about doing those checks. Sometimes a
|
|||
|
|
test’s behaviour can be quite complex, and needs to be explained so that
|
|||
|
|
future developers can understand and build on such tests in future.
|
|||
|
|
- Use the `g_assert_*()` functions inside unit tests, and do not use
|
|||
|
|
`g_assert()`. The latter is compiled out when GLib is built with
|
|||
|
|
`G_DISABLE_ASSERT`, and the former are not. The `g_assert_*()` functions
|
|||
|
|
also give more helpful error messages on test failure.
|
|||
|
|
* Performance tests must be able to be run unattended. In this mode they must
|
|||
|
|
choose default argument values which check that the performance test
|
|||
|
|
functions (i.e. without crashing) and doesn’t take too long to complete. This
|
|||
|
|
is used to automatically verify that performance tests still work, as they
|
|||
|
|
are typically used infrequently and are subject to bitrot.
|
|||
|
|
* Code coverage reports must be used to demonstrate that unit tests reach all
|
|||
|
|
newly submitted or significantly modified code, reaching all lines of code
|
|||
|
|
and a significant majority of branches. If this is not enforced, code ends up
|
|||
|
|
never being tested.
|
|||
|
|
* Code should be structured to be testable, which is typically only possible by
|
|||
|
|
writing tests at the same time as the code. Otherwise it is easy to design
|
|||
|
|
APIs which cannot easily be unit tested, and once those APIs are stable it is
|
|||
|
|
hard to retrofit tests to them.
|
|||
|
|
* Parsers, network-facing code or code which handles untrusted user input must
|
|||
|
|
have fuzz tests added, in the `fuzzing` directory. These are run by
|
|||
|
|
[oss-fuzz](https://github.com/google/oss-fuzz/) and are very effective at
|
|||
|
|
catching exploitable security issues. See the
|
|||
|
|
[fuzzing README](../fuzzing/README.md) for more details.
|
|||
|
|
* When fixing bugs in existing code, regression tests must be added when it is
|
|||
|
|
straightforward to do so. If it’s difficult to do so (such as if the code
|
|||
|
|
needs to be significantly restructured or APIs need to be changed), adding
|
|||
|
|
the regression tests can be deferred to a follow-up issue so as not to slow
|
|||
|
|
down bug fixing. In that case, the bug fix must be carefully manually tested
|
|||
|
|
before being merged.
|