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