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RIOT/tests/build_system/external_unittests
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Marian Buschsieweke eff6816ded
tests/unittests: allow out-of-tree tests 
This adds and documents the new `EXTERNAL_UNIT_TEST_DIRS` environment
variable that allows including out-of-tree unit tests. The intention is
to allow users of `EXTERNAL_MODULE_DIRS` to also provide corresponding
unit tests and run them all with a single test app.

Co-authored-by: crasbe <crasbe@gmail.com>
2025-11-08 17:55:58 +01:00
..
external_tests_dir/tests-out_of_tree
tests/unittests: allow out-of-tree tests
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tests
tests/unittests: allow out-of-tree tests
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tests-in_tree
tests/unittests: allow out-of-tree tests
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main.c
tests/unittests: allow out-of-tree tests
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Makefile
tests/unittests: allow out-of-tree tests
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map.h
tests/unittests: allow out-of-tree tests
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README.md
tests/unittests: allow out-of-tree tests
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README.md

External Unit Tests

This test apps provides two trivial unit tests: One provided internally in the folder of this unit tests apps and one provided externally via a variable. Since the test only validates correct operation of the build system, there is little value in running it on more than one board. For this reason, the app is limited to be build only for native / native64.

Implementation Details

The two tests contain a reference to a variable of the other tests, so that the app will not link if only if both of the unit tests are available at link time (or none). In addition, the python test runner will check that two tests are executed (to rule out that none was available).