Added validators for users and recipes (#1052)

* Added validators for users and recipes

provide a simple get api, allowing to test for existence of
- user by username
- recipe by slug
- group by name (not tested yet)

* updated formatting

* Use group_id+slug for recipes, use ValidationRespone

* Fixed Flake8 errors and warnings

* add missing field for TestUser init

tests/integration_tests/test_validators.py

@@ -0,0 +1,46 @@
+from fastapi.testclient import TestClient
+
+from mealie.db.db_setup import create_session
+from mealie.schema.recipe.recipe import Recipe
+from tests.utils.fixture_schemas import TestUser
+
+
+class Routes:
+    user = "/api/validators/user"
+    recipe = "/api/validators/recipe"
+
+
+def test_validators_user(api_client: TestClient, unique_user: TestUser):
+    session = create_session()
+
+    # Test existing user
+    response = api_client.get(Routes.user + f"/{unique_user.username}")
+    assert response.status_code == 200
+    response_data = response.json()
+    assert not response_data["valid"]
+
+    # Test non-existing user
+    response = api_client.get(Routes.user + f"/{unique_user.username}2")
+    assert response.status_code == 200
+    response_data = response.json()
+    assert response_data["valid"]
+
+    session.close()
+
+
+def test_validators_recipe(api_client: TestClient, random_recipe: Recipe):
+    session = create_session()
+
+    # Test existing user
+    response = api_client.get(Routes.recipe + f"/{random_recipe.group_id}/{random_recipe.slug}")
+    assert response.status_code == 200
+    response_data = response.json()
+    assert not response_data["valid"]
+
+    # Test non-existing user
+    response = api_client.get(Routes.recipe + f"/{random_recipe.group_id}/{random_recipe.slug}-test")
+    assert response.status_code == 200
+    response_data = response.json()
+    assert response_data["valid"]
+
+    session.close()