Remove test database connection check

It doesn't work well with multiple databases configured

django/tasks/backends/base.py

@@ -9,7 +9,6 @@ from django.tasks import DEFAULT_QUEUE_NAME
 from django.tasks.exceptions import InvalidTaskError
 from django.tasks.task import MAX_PRIORITY, MIN_PRIORITY, Task
 from django.tasks.utils import is_global_function
-from django.test.testcases import _DatabaseFailure
 from django.utils import timezone
 
 
@@ -40,11 +39,6 @@ class BaseTaskBackend(metaclass=ABCMeta):
         if not connections.settings:
             return False
 
-        # If connections are disabled during tests, there's nothing to commit to
-        for conn in connections.all():
-            if isinstance(conn.connect, _DatabaseFailure):
-                return False
-
         if isinstance(task.enqueue_on_commit, bool):
             return task.enqueue_on_commit
 

tests/tasks/test_dummy_backend.py

@@ -99,7 +99,7 @@ class DummyBackendTestCase(SimpleTestCase):
             await default_task_backend.aget_result("123")
 
     def test_enqueue_on_commit(self):
-        self.assertFalse(
+        self.assertTrue(
             default_task_backend._get_enqueue_on_commit_for_task(
                 test_tasks.enqueue_on_commit_task
             )
@@ -115,6 +115,8 @@ class DummyBackendTestCase(SimpleTestCase):
 
 
 class DummyBackendTransactionTestCase(TransactionTestCase):
+    available_apps = []
+
     @override_settings(
         TASKS={
             "default": {

tests/tasks/test_immediate_backend.py

@@ -171,7 +171,7 @@ class ImmediateBackendTestCase(SimpleTestCase):
             )
 
     def test_enqueue_on_commit(self):
-        self.assertFalse(
+        self.assertTrue(
             default_task_backend._get_enqueue_on_commit_for_task(
                 test_tasks.enqueue_on_commit_task
             )
@@ -186,6 +186,8 @@ class ImmediateBackendTestCase(SimpleTestCase):
 
 
 class ImmediateBackendTransactionTestCase(TransactionTestCase):
+    available_apps = []
+
     @override_settings(
         TASKS={
             "default": {