The test fails occasionally, see e.g.:

 https://gitlab.com/thuth/qemu/-/jobs/4196177756#L489
 https://gitlab.com/thuth/qemu/-/jobs/4623296271#L290

It also fails on my laptop in ca. 50% of all runs. Thus disable it by
default by using the QEMU_TEST_FLAKY_TESTS environment variable to fence
it (which we also already use in flaky qtests). While we're at it, also
document this variable in docs/devel/testing.rst.

Message-Id: <[email protected]>
Signed-off-by: Thomas Huth <[email protected]>
---
 docs/devel/testing.rst                   | 5 +++++
 tests/avocado/machine_aarch64_sbsaref.py | 2 +-
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/docs/devel/testing.rst b/docs/devel/testing.rst
index fb651eae11..b6ad21bed1 100644
--- a/docs/devel/testing.rst
+++ b/docs/devel/testing.rst
@@ -1384,6 +1384,11 @@ variable as shown on the code snippet below to skip the 
test:
   def test(self):
       do_something()
 
+QEMU_TEST_FLAKY_TESTS
+^^^^^^^^^^^^^^^^^^^^^
+Some tests are not working reliably and thus are disabled by default.
+Set this environment variable to enable them.
+
 Uninstalling Avocado
 ~~~~~~~~~~~~~~~~~~~~
 
diff --git a/tests/avocado/machine_aarch64_sbsaref.py 
b/tests/avocado/machine_aarch64_sbsaref.py
index cce6ef9f65..a794245e7e 100644
--- a/tests/avocado/machine_aarch64_sbsaref.py
+++ b/tests/avocado/machine_aarch64_sbsaref.py
@@ -8,7 +8,6 @@
 
 import os
 
-from avocado import skip
 from avocado import skipUnless
 from avocado.utils import archive
 
@@ -76,6 +75,7 @@ def fetch_firmware(self):
             "sbsa-ref",
         )
 
+    @skipUnless(os.getenv('QEMU_TEST_FLAKY_TESTS'), 'Test is not reliable')
     def test_sbsaref_edk2_firmware(self):
         """
         :avocado: tags=cpu:cortex-a57
-- 
2.39.3


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