Fixed #36083 -- Ran system checks in ParallelTestSuite workers.

Workers created by ParallelTestSuite were not running system
checks in the spawn multiprocessing mode. In general this is
fine, but system checks can have side effects expected by tests.

This patch runs system checks inside of _init_worker, which is
only called by ParallelTestSuite.

1 files changed, 7 insertions, 0 deletions

diff --git a/tests/test_runner/models.py b/tests/test_runner/models.py
index 80bf8dd8c7..54ec5e2b3d 100644
--- a/tests/test_runner/models.py
+++ b/tests/test_runner/models.py
@@ -6,6 +6,13 @@ class Person(models.Model):
     last_name = models.CharField(max_length=20)
     friends = models.ManyToManyField("self")
 
+    system_check_run_count = 0
+
+    @classmethod
+    def check(cls, *args, **kwargs):
+        cls.system_check_run_count += 1
+        return super().check(**kwargs)
+
 
 # A set of models that use a non-abstract inherited 'through' model.
 class ThroughBase(models.Model):