Struct TestServerBuilder 

pub struct TestServerBuilder { /* private fields */ }

Builder for creating test servers with real handlers.

Creates servers that communicate via MemoryTransport for in-process testing without subprocess spawning.

Example

use fastmcp_rust::testing::prelude::*;

// Create a simple test server
let (router, client_transport, server_transport) = TestServer::builder()
    .with_name("test-server")
    .build();

// Use client_transport to communicate with server

Implementations

impl TestServerBuilder

pub fn new() -> Self

Creates a new test server builder with default settings.

pub fn with_name(self, name: impl Into<String>) -> Self

Sets the server name.

pub fn with_version(self, version: impl Into<String>) -> Self

Sets the server version.

pub fn with_request_timeout(self, secs: u64) -> Self

Sets the request timeout in seconds.

pub fn build(self) -> (Router, MemoryTransport, MemoryTransport)

Builds the test server and returns it with a client transport.

Returns a tuple of:

• Router: The configured router (use with server run loop)
• MemoryTransport: Client-side transport for sending requests
• MemoryTransport: Server-side transport for the server run loop

Example

let (router, client_transport, server_transport) = TestServer::builder()
    .build();

// Run server in a background thread (omitted here). Prefer using the
// higher-level E2E harness helpers in this crate which join threads on drop.

// Use client_transport for testing

pub fn build_server_builder( self, ) -> (ServerBuilder, MemoryTransport, MemoryTransport)

Builds a full ServerBuilder for more control.

Use this when you need access to the full server builder API.

Example

let (builder, client_transport, server_transport) = TestServer::builder()
    .build_server_builder();

// Customize further with the real server builder
let server = builder
    .instructions("Test server")
    .build();

Trait Implementations

impl Default for TestServerBuilder

fn default() -> Self

Returns the “default value” for a type.