tests: add tests for non-ASCII characters in flow name (#8532)

* CodeRabbit Generated Unit Tests: Update unit tests in test_projects.py

* [autofix.ci] apply automated fixes

* 📝 CodeRabbit Chat: Add unit tests for projects API in test_projects.py

* [autofix.ci] apply automated fixes

* refactor(tests): streamline project tests and enhance Cyrillic character handling

- Removed redundant test cases for unauthorized project creation and duplicate project names.
- Consolidated Cyrillic character tests for clarity and improved documentation.
- Added constants for Cyrillic project name and description to enhance readability.

---------

Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>
Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>
Co-authored-by: Gabriel Luiz Freitas Almeida <gabriel@langflow.org>

src/backend/tests/unit/api/v1/test_projects.py

@@ -1,7 +1,12 @@
+from uuid import uuid4
+
 import pytest
 from fastapi import status
 from httpx import AsyncClient
 
+CYRILLIC_NAME = "Новый проект"
+CYRILLIC_DESC = "Описание проекта с кириллицей"  # noqa: RUF001
+
 
 @pytest.fixture
 def basic_case():
@@ -87,3 +92,80 @@ async def test_update_project(client: AsyncClient, logged_in_headers, basic_case
     assert "description" in result, "The dictionary must contain a key called 'description'"
     assert "id" in result, "The dictionary must contain a key called 'id'"
     assert "parent_id" in result, "The dictionary must contain a key called 'parent_id'"
+
+
+async def test_create_project_validation_error(client: AsyncClient, logged_in_headers, basic_case):
+    invalid_case = basic_case.copy()
+    invalid_case.pop("name")
+    response = await client.post("api/v1/projects/", json=invalid_case, headers=logged_in_headers)
+    assert response.status_code == status.HTTP_422_UNPROCESSABLE_ENTITY
+
+
+async def test_delete_project_then_404(client: AsyncClient, logged_in_headers, basic_case):
+    create_resp = await client.post("api/v1/projects/", json=basic_case, headers=logged_in_headers)
+    proj_id = create_resp.json()["id"]
+
+    del_resp = await client.delete(f"api/v1/projects/{proj_id}", headers=logged_in_headers)
+    assert del_resp.status_code == status.HTTP_204_NO_CONTENT
+
+    get_resp = await client.get(f"api/v1/projects/{proj_id}", headers=logged_in_headers)
+    assert get_resp.status_code == status.HTTP_404_NOT_FOUND
+
+
+async def test_read_project_invalid_id_format(client: AsyncClient, logged_in_headers):
+    bad_id = "not-a-uuid"
+    response = await client.get(f"api/v1/projects/{bad_id}", headers=logged_in_headers)
+    assert response.status_code in (status.HTTP_422_UNPROCESSABLE_ENTITY, status.HTTP_400_BAD_REQUEST)
+
+
+async def test_read_projects_pagination(client: AsyncClient, logged_in_headers):
+    response = await client.get("api/v1/projects/?limit=1&offset=0", headers=logged_in_headers)
+    assert response.status_code == status.HTTP_200_OK
+    result = response.json()
+    if isinstance(result, list):
+        assert len(result) <= 1
+    else:
+        assert "items" in result
+        assert result.get("limit") == 1
+
+
+async def test_read_projects_empty(client: AsyncClient, logged_in_headers):
+    # Ensure DB is clean by fetching with a random header that forces each test transactional isolation
+    random_headers = {**logged_in_headers, "X-Transaction-ID": str(uuid4())}
+    response = await client.get("api/v1/projects/", headers=random_headers)
+    if response.json():
+        pytest.skip("Pre-existing projects found; skipping empty list assertion")
+    assert response.status_code == status.HTTP_200_OK
+    assert response.json() == []
+
+
+async def test_create_and_read_project_cyrillic(client: AsyncClient, logged_in_headers):
+    """Ensure that the API correctly handles non-ASCII (Cyrillic) characters during project creation and retrieval."""
+    payload = {
+        "name": CYRILLIC_NAME,
+        "description": CYRILLIC_DESC,
+        "flows_list": [],
+        "components_list": [],
+    }
+
+    # Create the project with Cyrillic characters
+    create_resp = await client.post("api/v1/projects/", json=payload, headers=logged_in_headers)
+    assert create_resp.status_code == status.HTTP_201_CREATED
+    created = create_resp.json()
+    assert created["name"] == CYRILLIC_NAME
+    assert created["description"] == CYRILLIC_DESC
+    proj_id = created["id"]
+
+    # Fetch the project back to verify round-trip UTF-8 integrity
+    get_resp = await client.get(f"api/v1/projects/{proj_id}", headers=logged_in_headers)
+    assert get_resp.status_code == status.HTTP_200_OK
+    fetched = get_resp.json()
+
+    # Handle potential pagination/envelope variations already seen in other tests
+    if isinstance(fetched, dict) and "folder" in fetched:
+        fetched = fetched["folder"]
+    elif isinstance(fetched, dict) and "project" in fetched:
+        fetched = fetched["project"]
+
+    assert fetched["name"] == CYRILLIC_NAME
+    assert fetched["description"] == CYRILLIC_DESC