Some tests have a very long runtime and might run into timeout
issues e.g. when QEMU has been compiled with --enable-debug.
Add a decorator for marking them more easily and document the
corresponding environment variable that is used to enable the
tests.

Signed-off-by: Thomas Huth <th...@redhat.com>
---
 docs/devel/testing/functional.rst        |  8 ++++++++
 tests/functional/qemu_test/__init__.py   |  2 +-
 tests/functional/qemu_test/decorators.py | 14 ++++++++++++++
 tests/functional/test_arm_quanta_gsj.py  |  5 +++--
 4 files changed, 26 insertions(+), 3 deletions(-)

diff --git a/docs/devel/testing/functional.rst 
b/docs/devel/testing/functional.rst
index ae238ed3fc..7d9396b696 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_TIMEOUT_EXPECTED
+^^^^^^^^^^^^^^^^^^^^^^^^^^
+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_TIMEOUT_EXPECTED environment variable has been set.
+
 
 .. _unittest: https://docs.python.org/3/library/unittest.html
diff --git a/tests/functional/qemu_test/__init__.py 
b/tests/functional/qemu_test/__init__.py
index da1830286d..b1a19d2a4b 100644
--- a/tests/functional/qemu_test/__init__.py
+++ b/tests/functional/qemu_test/__init__.py
@@ -14,7 +14,7 @@
 from .testcase import QemuBaseTest, QemuUserTest, QemuSystemTest
 from .linuxkernel import LinuxKernelTest
 from .decorators import skipIfMissingCommands, skipIfNotMachine, \
-    skipFlakyTest, skipUntrustedTest, skipBigDataTest, \
+    skipFlakyTest, skipUntrustedTest, skipBigDataTest, skipLongRuntime, \
     skipIfMissingImports
 from .archive import archive_extract
 from .uncompress import uncompress
diff --git a/tests/functional/qemu_test/decorators.py 
b/tests/functional/qemu_test/decorators.py
index df088bc090..8f311e5309 100644
--- a/tests/functional/qemu_test/decorators.py
+++ b/tests/functional/qemu_test/decorators.py
@@ -86,6 +86,20 @@ def skipBigDataTest():
     return skipUnless(os.getenv('QEMU_TEST_ALLOW_LARGE_STORAGE'),
                       'Test requires large host storage space')
 
+'''
+Decorator to skip execution of tests which have a really long
+runtime (and might e.g. time out if QEMU has been compiled with
+debugging enabled) unless the $QEMU_TEST_TIMEOUT_EXPECTED
+environment variable is set
+
+Example:
+
+  @skipLongRuntime()
+'''
+def skipLongRuntime():
+    return skipUnless(os.getenv('QEMU_TEST_TIMEOUT_EXPECTED'),
+                      'Test has a very long runtime and might time out')
+
 '''
 Decorator to skip execution of a test if the list
 of python imports is not available.
diff --git a/tests/functional/test_arm_quanta_gsj.py 
b/tests/functional/test_arm_quanta_gsj.py
index 7b82e2185c..fe1d60d649 100755
--- a/tests/functional/test_arm_quanta_gsj.py
+++ b/tests/functional/test_arm_quanta_gsj.py
@@ -8,7 +8,8 @@
 
 from qemu_test import LinuxKernelTest, Asset, exec_command_and_wait_for_pattern
 from qemu_test import interrupt_interactive_console_until_pattern
-from unittest import skipUnless
+from qemu_test import skipLongRuntime
+
 
 class EmcraftSf2Machine(LinuxKernelTest):
 
@@ -32,7 +33,7 @@ class EmcraftSf2Machine(LinuxKernelTest):
          '20200711-gsj-qemu-0/nuvoton-npcm730-gsj.dtb'),
         '3249b2da787d4b9ad4e61f315b160abfceb87b5e1895a7ce898ce7f40c8d4045')
 
-    @skipUnless(os.getenv('QEMU_TEST_TIMEOUT_EXPECTED'), 'Test might timeout')
+    @skipLongRuntime()
     def test_arm_quanta_gsj(self):
         self.set_machine('quanta-gsj')
         image_path = self.uncompress(self.ASSET_IMAGE, format='gz')
-- 
2.48.1


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