---
title: tests
sidebarTitle: tests
---
# `fastmcp.utilities.tests`
## Functions
### `temporary_settings`
```python
temporary_settings(**kwargs: Any)
```
Temporarily override FastMCP setting values.
**Args:**
- `**kwargs`: The settings to override, including nested settings.
### `run_server_in_process`
```python
run_server_in_process(server_fn: Callable[..., None], *args, **kwargs) -> Generator[str, None, None]
```
Context manager that runs a FastMCP server in a separate process and
returns the server URL. When the context manager is exited, the server process is killed.
**Args:**
- `server_fn`: The function that runs a FastMCP server. FastMCP servers are
not pickleable, so we need a function that creates and runs one.
- `*args`: Arguments to pass to the server function.
- `provide_host_and_port`: Whether to provide the host and port to the server function as kwargs.
- `host`: Host to bind the server to (default\: "127.0.0.1").
- `port`: Port to bind the server to (default\: find available port).
- `**kwargs`: Keyword arguments to pass to the server function.
**Returns:**
- The server URL.
### `caplog_for_fastmcp`
```python
caplog_for_fastmcp(caplog)
```
Context manager to capture logs from FastMCP loggers even when propagation is disabled.
## Classes
### `HeadlessOAuth`
OAuth provider that bypasses browser interaction for testing.
This simulates the complete OAuth flow programmatically by making HTTP requests
instead of opening a browser and running a callback server. Useful for automated testing.
**Methods:**
#### `redirect_handler`
```python
redirect_handler(self, authorization_url: str) -> None
```
Make HTTP request to authorization URL and store response for callback handler.
#### `callback_handler`
```python
callback_handler(self) -> tuple[str, str | None]
```
Parse stored response and return (auth_code, state).