test(backend): switch to django test runner

config/test_runner.py

@@ -0,0 +1,51 @@
+from pathlib import Path
+
+from django.apps import apps
+from django.test.runner import DiscoverRunner
+
+
+class AppDiscoverRunner(DiscoverRunner):
+    def load_tests_for_label(self, label, discover_kwargs):
+        if label.startswith("apps."):
+            try:
+                app_config = apps.get_app_config(label.split(".", 1)[1])
+            except LookupError:
+                return super().load_tests_for_label(label, discover_kwargs)
+
+            test_dir = Path(app_config.path) / "tests"
+            if test_dir.exists():
+                repo_root = Path(__file__).resolve().parent.parent
+                discover_kwargs = dict(discover_kwargs)
+                discover_kwargs["top_level_dir"] = str(repo_root)
+                return self.test_loader.discover(
+                    start_dir=str(test_dir),
+                    **discover_kwargs,
+                )
+
+        return super().load_tests_for_label(label, discover_kwargs)
+
+    def build_suite(self, test_labels=None, extra_tests=None, **kwargs):
+        if test_labels:
+            return super().build_suite(
+                test_labels,
+                extra_tests=extra_tests,
+                **kwargs,
+            )
+
+        suite = self.test_suite()
+        repo_root = Path(__file__).resolve().parent.parent
+
+        for app_config in apps.get_app_configs():
+            test_dir = Path(app_config.path) / "tests"
+            if app_config.name.startswith("apps.") and test_dir.exists():
+                suite.addTests(
+                    self.test_loader.discover(
+                        start_dir=str(test_dir),
+                        pattern=self.pattern,
+                        top_level_dir=str(repo_root),
+                    )
+                )
+
+        if extra_tests:
+            suite.addTests(extra_tests)
+        return suite