Add tests for BadRequest construtor

rest_registration/exceptions.py

@@ -118,8 +118,8 @@ def _wrap_detail_in_dict(detail: _APIExceptionInput) -> Dict[str, List[Any]]:
 def _extract_details(detail: _APIExceptionInput) -> List[Union[_Detail, StrOrPromise]]:
     if detail is None:
         return []
-    if isinstance(detail, Sequence):
-        return [ed for d in detail for ed in _extract_details(d)]
     if isinstance(detail, Mapping):
         return [ed for d in detail.values() for ed in _extract_details(d)]
+    if isinstance(detail, Sequence) and not isinstance(detail, str):
+        return [ed for d in detail for ed in _extract_details(d)]
     return [detail]

tests/test_exceptions.py

@@ -0,0 +1,50 @@
+import pytest
+
+from rest_registration.exceptions import BadRequest, ErrorDetail
+from tests.helpers.settings import override_rest_registration_settings
+
+
+@pytest.mark.parametrize(
+    "detail,"
+    "code,"
+    "expected_obj_detail", (
+        ("test err", "test-err", ErrorDetail("test err", code="test-err")),
+        (None, None, ErrorDetail("Bad Request", code="bad-request")),
+    ),
+)
+def test_bad_request_detail(detail, code, expected_obj_detail):
+    exc = BadRequest(detail=detail, code=code)
+    assert exc.detail == expected_obj_detail
+
+
+@pytest.mark.parametrize(
+    "detail,"
+    "expected_obj_detail", [
+        pytest.param(
+            None,
+            {"non_field_errors": [ErrorDetail("Bad Request", code="bad-request")]},
+            id="none",
+        ),
+        pytest.param(
+            ["test err"],
+            {"non_field_errors": [ErrorDetail("test err", code="bad-request")]},
+            id="str_list",
+        ),
+        pytest.param(
+            "test err",
+            {"non_field_errors": [ErrorDetail("test err", code="bad-request")]},
+            id="str",
+        ),
+        pytest.param(
+            {"field": ["test err"]},
+            {"field": [ErrorDetail("test err", code="bad-request")]},
+            id="str_list_dict"
+        ),
+    ],
+)
+@override_rest_registration_settings({
+    'USE_NON_FIELD_ERRORS_KEY_FROM_DRF_SETTINGS': True,
+})
+def test_bad_request_detail_with_use_non_field_errors_key(detail, expected_obj_detail):
+    exc = BadRequest(detail=detail)
+    assert exc.detail == expected_obj_detail