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import sys
from typing import Any, List, Union
from tests.utils import pydantic_snapshot, skip_module_if_py_gte_314
if sys.version_info >= (3, 14):
skip_module_if_py_gte_314()
from fastapi import FastAPI
from fastapi._compat.v1 import BaseModel
from fastapi.testclient import TestClient
from inline_snapshot import snapshot
class SubItem(BaseModel):
name: str
class Item(BaseModel):
title: str
size: int
description: Union[str, None] = None
sub: SubItem
multi: List[SubItem] = []
app = FastAPI()
@app.post("/simple-model")
def handle_simple_model(data: SubItem) -> SubItem:
return data
@app.post("/simple-model-filter", response_model=SubItem)
def handle_simple_model_filter(data: SubItem) -> Any:
extended_data = data.dict()
extended_data.update({"secret_price": 42})
return extended_data
@app.post("/item")
def handle_item(data: Item) -> Item:
return data
@app.post("/item-filter", response_model=Item)
def handle_item_filter(data: Item) -> Any:
extended_data = data.dict()
extended_data.update({"secret_data": "classified", "internal_id": 12345})
extended_data["sub"].update({"internal_id": 67890})
return extended_data
client = TestClient(app)
def test_old_simple_model():
response = client.post(
"/simple-model",
json={"name": "Foo"},
)
assert response.status_code == 200, response.text
assert response.json() == {"name": "Foo"}
def test_old_simple_model_validation_error():
response = client.post(
"/simple-model",
json={"wrong_name": "Foo"},
)
assert response.status_code == 422, response.text
assert response.json() == snapshot(
{
"detail": [
{
"loc": ["body", "name"],
"msg": "field required",
"type": "value_error.missing",
}
]
}
)
def test_old_simple_model_filter():
response = client.post(
"/simple-model-filter",
json={"name": "Foo"},
)
assert response.status_code == 200, response.text
assert response.json() == {"name": "Foo"}
def test_item_model():
response = client.post(
"/item",
json={
"title": "Test Item",
"size": 100,
"description": "This is a test item",
"sub": {"name": "SubItem1"},
"multi": [{"name": "Multi1"}, {"name": "Multi2"}],
},
)
assert response.status_code == 200, response.text
assert response.json() == {
"title": "Test Item",
"size": 100,
"description": "This is a test item",
"sub": {"name": "SubItem1"},
"multi": [{"name": "Multi1"}, {"name": "Multi2"}],
}
def test_item_model_minimal():
response = client.post(
"/item",
json={"title": "Minimal Item", "size": 50, "sub": {"name": "SubMin"}},
)
assert response.status_code == 200, response.text
assert response.json() == {
"title": "Minimal Item",
"size": 50,
"description": None,
"sub": {"name": "SubMin"},
"multi": [],
}
def test_item_model_validation_errors():
response = client.post(
"/item",
json={"title": "Missing fields"},
)
assert response.status_code == 422, response.text
error_detail = response.json()["detail"]
assert len(error_detail) == 2
assert {
"loc": ["body", "size"],
"msg": "field required",
"type": "value_error.missing",
} in error_detail
assert {
"loc": ["body", "sub"],
"msg": "field required",
"type": "value_error.missing",
} in error_detail
def test_item_model_nested_validation_error():
response = client.post(
"/item",
json={"title": "Test Item", "size": 100, "sub": {"wrong_field": "test"}},
)
assert response.status_code == 422, response.text
assert response.json() == snapshot(
{
"detail": [
{
"loc": ["body", "sub", "name"],
"msg": "field required",
"type": "value_error.missing",
}
]
}
)
def test_item_model_invalid_type():
response = client.post(
"/item",
json={"title": "Test Item", "size": "not_a_number", "sub": {"name": "SubItem"}},
)
assert response.status_code == 422, response.text
assert response.json() == snapshot(
{
"detail": [
{
"loc": ["body", "size"],
"msg": "value is not a valid integer",
"type": "type_error.integer",
}
]
}
)
def test_item_filter():
response = client.post(
"/item-filter",
json={
"title": "Filtered Item",
"size": 200,
"description": "Test filtering",
"sub": {"name": "SubFiltered"},
"multi": [],
},
)
assert response.status_code == 200, response.text
result = response.json()
assert result == {
"title": "Filtered Item",
"size": 200,
"description": "Test filtering",
"sub": {"name": "SubFiltered"},
"multi": [],
}
assert "secret_data" not in result
assert "internal_id" not in result
def test_openapi_schema():
response = client.get("/openapi.json")
assert response.status_code == 200, response.text
assert response.json() == snapshot(
{
"openapi": "3.1.0",
"info": {"title": "FastAPI", "version": "0.1.0"},
"paths": {
"/simple-model": {
"post": {
"summary": "Handle Simple Model",
"operationId": "handle_simple_model_simple_model_post",
"requestBody": {
"content": {
"application/json": {
"schema": pydantic_snapshot(
v2=snapshot(
{
"allOf": [
{
"$ref": "#/components/schemas/SubItem"
}
],
"title": "Data",
}
),
v1=snapshot(
{"$ref": "#/components/schemas/SubItem"}
),
)
}
},
"required": True,
},
"responses": {
"200": {
"description": "Successful Response",
"content": {
"application/json": {
"schema": {
"$ref": "#/components/schemas/SubItem"
}
}
},
},
"422": {
"description": "Validation Error",
"content": {
"application/json": {
"schema": {
"$ref": "#/components/schemas/HTTPValidationError"
}
}
},
},
},
}
},
"/simple-model-filter": {
"post": {
"summary": "Handle Simple Model Filter",
"operationId": "handle_simple_model_filter_simple_model_filter_post",
"requestBody": {
"content": {
"application/json": {
"schema": pydantic_snapshot(
v2=snapshot(
{
"allOf": [
{
"$ref": "#/components/schemas/SubItem"
}
],
"title": "Data",
}
),
v1=snapshot(
{"$ref": "#/components/schemas/SubItem"}
),
)
}
},
"required": True,
},
"responses": {
"200": {
"description": "Successful Response",
"content": {
"application/json": {
"schema": {
"$ref": "#/components/schemas/SubItem"
}
}
},
},
"422": {
"description": "Validation Error",
"content": {
"application/json": {
"schema": {
"$ref": "#/components/schemas/HTTPValidationError"
}
}
},
},
},
}
},
"/item": {
"post": {
"summary": "Handle Item",
"operationId": "handle_item_item_post",
"requestBody": {
"content": {
"application/json": {
"schema": pydantic_snapshot(
v2=snapshot(
{
"allOf": [
{
"$ref": "#/components/schemas/Item"
}
],
"title": "Data",
}
),
v1=snapshot(
{"$ref": "#/components/schemas/Item"}
),
)
}
},
"required": True,
},
"responses": {
"200": {
"description": "Successful Response",
"content": {
"application/json": {
"schema": {"$ref": "#/components/schemas/Item"}
}
},
},
"422": {
"description": "Validation Error",
"content": {
"application/json": {
"schema": {
"$ref": "#/components/schemas/HTTPValidationError"
}
}
},
},
},
}
},
"/item-filter": {
"post": {
"summary": "Handle Item Filter",
"operationId": "handle_item_filter_item_filter_post",
"requestBody": {
"content": {
"application/json": {
"schema": pydantic_snapshot(
v2=snapshot(
{
"allOf": [
{
"$ref": "#/components/schemas/Item"
}
],
"title": "Data",
}
),
v1=snapshot(
{"$ref": "#/components/schemas/Item"}
),
)
}
},
"required": True,
},
"responses": {
"200": {
"description": "Successful Response",
"content": {
"application/json": {
"schema": {"$ref": "#/components/schemas/Item"}
}
},
},
"422": {
"description": "Validation Error",
"content": {
"application/json": {
"schema": {
"$ref": "#/components/schemas/HTTPValidationError"
}
}
},
},
},
}
},
},
"components": {
"schemas": {
"HTTPValidationError": {
"properties": {
"detail": {
"items": {
"$ref": "#/components/schemas/ValidationError"
},
"type": "array",
"title": "Detail",
}
},
"type": "object",
"title": "HTTPValidationError",
},
"Item": {
"properties": {
"title": {"type": "string", "title": "Title"},
"size": {"type": "integer", "title": "Size"},
"description": {"type": "string", "title": "Description"},
"sub": {"$ref": "#/components/schemas/SubItem"},
"multi": {
"items": {"$ref": "#/components/schemas/SubItem"},
"type": "array",
"title": "Multi",
"default": [],
},
},
"type": "object",
"required": ["title", "size", "sub"],
"title": "Item",
},
"SubItem": {
"properties": {"name": {"type": "string", "title": "Name"}},
"type": "object",
"required": ["name"],
"title": "SubItem",
},
"ValidationError": {
"properties": {
"loc": {
"items": {
"anyOf": [{"type": "string"}, {"type": "integer"}]
},
"type": "array",
"title": "Location",
},
"msg": {"type": "string", "title": "Message"},
"type": {"type": "string", "title": "Error Type"},
},
"type": "object",
"required": ["loc", "msg", "type"],
"title": "ValidationError",
},
}
},
}
)