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-rw-r--r--docs/devel/testing/functional.rst8
1 files changed, 8 insertions, 0 deletions
diff --git a/docs/devel/testing/functional.rst b/docs/devel/testing/functional.rst
index ae238ed..ecc7389 100644
--- a/docs/devel/testing/functional.rst
+++ b/docs/devel/testing/functional.rst
@@ -351,5 +351,13 @@ the code snippet below:
Tests should not live in this state forever and should either be fixed
or eventually removed.
+QEMU_TEST_ALLOW_SLOW
+^^^^^^^^^^^^^^^^^^^^
+Tests that have a very long runtime and might run into timeout issues
+e.g. if the QEMU binary has been compiled with debugging options enabled.
+To avoid these timeout issues by default and to save some precious CPU
+cycles during normal testing, such tests are disabled by default unless
+the QEMU_TEST_ALLOW_SLOW environment variable has been set.
+
.. _unittest: https://docs.python.org/3/library/unittest.html