✅ Add tests for Pydantic v1 parameters

tests/test_compat_params_v1.py

@@ -0,0 +1,320 @@
+from typing import Annotated, Optional
+
+from fastapi import FastAPI
+from fastapi._compat._params_v1 import Body, Cookie, Header, Path, Query
+from fastapi._compat.v1 import BaseModel
+from fastapi.testclient import TestClient
+from inline_snapshot import snapshot
+
+
+class Item(BaseModel):
+    name: str
+    price: float
+    description: Optional[str] = None
+
+
+app = FastAPI()
+
+
+@app.get("/items/{item_id}")
+def get_item_with_path(
+    item_id: Annotated[int, Path(title="The ID of the item", ge=1, le=1000)],
+):
+    return {"item_id": item_id}
+
+
+@app.get("/items/")
+def get_items_with_query(
+    q: Annotated[
+        Optional[str], Query(min_length=3, max_length=50, pattern="^[a-zA-Z0-9 ]+$")
+    ] = None,
+    skip: Annotated[int, Query(ge=0)] = 0,
+    limit: Annotated[int, Query(ge=1, le=100)] = 10,
+):
+    return {"q": q, "skip": skip, "limit": limit}
+
+
+@app.get("/users/")
+def get_user_with_header(
+    x_custom: Annotated[Optional[str], Header()] = None,
+    x_token: Annotated[Optional[str], Header(convert_underscores=True)] = None,
+):
+    return {"x_custom": x_custom, "x_token": x_token}
+
+
+@app.get("/cookies/")
+def get_cookies(
+    session_id: Annotated[Optional[str], Cookie()] = None,
+    tracking_id: Annotated[Optional[str], Cookie(min_length=10)] = None,
+):
+    return {"session_id": session_id, "tracking_id": tracking_id}
+
+
+@app.post("/items/")
+def create_item(
+    item: Annotated[
+        Item,
+        Body(examples=[{"name": "Foo", "price": 35.4, "description": "The Foo item"}]),
+    ],
+):
+    return {"item": item}
+
+
+@app.post("/items-embed/")
+def create_item_embed(
+    item: Annotated[Item, Body(embed=True)],
+):
+    return {"item": item}
+
+
+@app.put("/items/{item_id}")
+def update_item(
+    item_id: Annotated[int, Path(ge=1)],
+    item: Annotated[Item, Body()],
+    importance: Annotated[int, Body(gt=0, le=10)],
+):
+    return {"item": item, "importance": importance}
+
+
+client = TestClient(app)
+
+
+# Path parameter tests
+def test_path_param_valid():
+    response = client.get("/items/50")
+    assert response.status_code == 200
+    assert response.json() == {"item_id": 50}
+
+
+def test_path_param_too_large():
+    response = client.get("/items/1001")
+    assert response.status_code == 422
+    error = response.json()["detail"][0]
+    assert error["loc"] == ["path", "item_id"]
+
+
+def test_path_param_too_small():
+    response = client.get("/items/0")
+    assert response.status_code == 422
+    error = response.json()["detail"][0]
+    assert error["loc"] == ["path", "item_id"]
+
+
+# Query parameter tests
+def test_query_params_valid():
+    response = client.get("/items/?q=test search&skip=5&limit=20")
+    assert response.status_code == 200
+    assert response.json() == {"q": "test search", "skip": 5, "limit": 20}
+
+
+def test_query_params_defaults():
+    response = client.get("/items/")
+    assert response.status_code == 200
+    assert response.json() == {"q": None, "skip": 0, "limit": 10}
+
+
+def test_query_param_too_short():
+    response = client.get("/items/?q=ab")
+    assert response.status_code == 422
+    error = response.json()["detail"][0]
+    assert error["loc"] == ["query", "q"]
+
+
+def test_query_param_invalid_pattern():
+    response = client.get("/items/?q=test@#$")
+    assert response.status_code == 422
+    error = response.json()["detail"][0]
+    assert error["loc"] == ["query", "q"]
+
+
+def test_query_param_limit_too_large():
+    response = client.get("/items/?limit=101")
+    assert response.status_code == 422
+    error = response.json()["detail"][0]
+    assert error["loc"] == ["query", "limit"]
+
+
+# Header parameter tests
+def test_header_params():
+    response = client.get(
+        "/users/",
+        headers={"X-Custom": "Plumbus", "X-Token": "secret-token"},
+    )
+    assert response.status_code == 200
+    assert response.json() == {
+        "x_custom": "Plumbus",
+        "x_token": "secret-token",
+    }
+
+
+def test_header_underscore_conversion():
+    response = client.get(
+        "/users/",
+        headers={"x-token": "secret-token-with-dash"},
+    )
+    assert response.status_code == 200
+    assert response.json()["x_token"] == "secret-token-with-dash"
+
+
+def test_header_params_none():
+    response = client.get("/users/")
+    assert response.status_code == 200
+    assert response.json() == {"x_custom": None, "x_token": None}
+
+
+# Cookie parameter tests
+def test_cookie_params():
+    with TestClient(app) as client:
+        client.cookies.set("session_id", "abc123")
+        client.cookies.set("tracking_id", "1234567890abcdef")
+        response = client.get("/cookies/")
+    assert response.status_code == 200
+    assert response.json() == {
+        "session_id": "abc123",
+        "tracking_id": "1234567890abcdef",
+    }
+
+
+def test_cookie_tracking_id_too_short():
+    with TestClient(app) as client:
+        client.cookies.set("tracking_id", "short")
+        response = client.get("/cookies/")
+    assert response.status_code == 422
+    assert response.json() == snapshot(
+        {
+            "detail": [
+                {
+                    "loc": ["cookie", "tracking_id"],
+                    "msg": "ensure this value has at least 10 characters",
+                    "type": "value_error.any_str.min_length",
+                    "ctx": {"limit_value": 10},
+                }
+            ]
+        }
+    )
+
+
+def test_cookie_params_none():
+    response = client.get("/cookies/")
+    assert response.status_code == 200
+    assert response.json() == {"session_id": None, "tracking_id": None}
+
+
+# Body parameter tests
+def test_body_param():
+    response = client.post(
+        "/items/",
+        json={"name": "Test Item", "price": 29.99, "description": "A test item"},
+    )
+    assert response.status_code == 200
+    assert response.json() == {
+        "item": {
+            "name": "Test Item",
+            "price": 29.99,
+            "description": "A test item",
+        }
+    }
+
+
+def test_body_param_minimal():
+    response = client.post(
+        "/items/",
+        json={"name": "Minimal", "price": 9.99},
+    )
+    assert response.status_code == 200
+    assert response.json() == {
+        "item": {"name": "Minimal", "price": 9.99, "description": None}
+    }
+
+
+def test_body_param_missing_required():
+    response = client.post(
+        "/items/",
+        json={"name": "Incomplete"},
+    )
+    assert response.status_code == 422
+    error = response.json()["detail"][0]
+    assert error["loc"] == ["body", "price"]
+
+
+def test_body_embed():
+    response = client.post(
+        "/items-embed/",
+        json={"item": {"name": "Embedded", "price": 15.0}},
+    )
+    assert response.status_code == 200
+    assert response.json() == {
+        "item": {"name": "Embedded", "price": 15.0, "description": None}
+    }
+
+
+def test_body_embed_wrong_structure():
+    response = client.post(
+        "/items-embed/",
+        json={"name": "Not Embedded", "price": 15.0},
+    )
+    assert response.status_code == 422
+
+
+# Multiple body parameters test
+def test_multiple_body_params():
+    response = client.put(
+        "/items/5",
+        json={
+            "item": {"name": "Updated Item", "price": 49.99},
+            "importance": 8,
+        },
+    )
+    assert response.status_code == 200
+    assert response.json() == snapshot(
+        {
+            "item": {"name": "Updated Item", "price": 49.99, "description": None},
+            "importance": 8,
+        }
+    )
+
+
+def test_multiple_body_params_importance_too_large():
+    response = client.put(
+        "/items/5",
+        json={
+            "item": {"name": "Item", "price": 10.0},
+            "importance": 11,
+        },
+    )
+    assert response.status_code == 422
+    assert response.json() == snapshot(
+        {
+            "detail": [
+                {
+                    "loc": ["body", "importance"],
+                    "msg": "ensure this value is less than or equal to 10",
+                    "type": "value_error.number.not_le",
+                    "ctx": {"limit_value": 10},
+                }
+            ]
+        }
+    )
+
+
+def test_multiple_body_params_importance_too_small():
+    response = client.put(
+        "/items/5",
+        json={
+            "item": {"name": "Item", "price": 10.0},
+            "importance": 0,
+        },
+    )
+    assert response.status_code == 422
+    assert response.json() == snapshot(
+        {
+            "detail": [
+                {
+                    "loc": ["body", "importance"],
+                    "msg": "ensure this value is greater than 0",
+                    "type": "value_error.number.not_gt",
+                    "ctx": {"limit_value": 0},
+                }
+            ]
+        }
+    )