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-rw-r--r--doc/develop/tests_writing.rst8
1 files changed, 8 insertions, 0 deletions
diff --git a/doc/develop/tests_writing.rst b/doc/develop/tests_writing.rst
index b6972489d4c..1a020caa411 100644
--- a/doc/develop/tests_writing.rst
+++ b/doc/develop/tests_writing.rst
@@ -228,6 +228,14 @@ Note that the MEM_TEST() macros is defined at the top of the file.
Example commit: 9fe064646d2 ("bloblist: Support relocating to a larger space") [1]
+* A successful test returns 0.
+* A skipped test returns -EAGAIN.
+* Any other value signals a failure.
+
+Include ``test/ut.h`` defines a number of macros to check values and to return
+from the test function if the assertion fails. See :doc:`../api/test`
+for details.
+
[1] https://gitlab.denx.de/u-boot/u-boot/-/commit/9fe064646d2