Struct MockUsbTransfer 

pub struct MockUsbTransfer { /* private fields */ }

In-memory mock of UsbTransfer for unit tests.

Pre-load expected read responses per endpoint, then execute protocol logic. After the test, inspect captured writes to verify correctness.

Thread safety

State lives behind a Mutex, so the Send + Sync that UsbTransfer requires is derived rather than asserted. The mock used to hold RefCell and claim the bounds with unsafe impl, which was unsound: RefCell’s borrow flag is not atomic, so two threads sharing one mock could hold overlapping borrow_mut()s and alias the same &mut.

Implementations

impl MockUsbTransfer

pub fn new() -> Self

Create an empty mock with no pre-loaded responses.

pub fn enqueue_read(&self, endpoint: u8, data: Vec<u8>)

Enqueue a response that will be returned by the next bulk_read on the given endpoint.

pub fn take_writes(&self, endpoint: u8) -> Vec<Vec<u8>>

Return all captured write payloads for the given endpoint.

Trait Implementations

impl Default for MockUsbTransfer

fn default() -> Self

Returns the “default value” for a type.

impl UsbTransfer for MockUsbTransfer

fn bulk_write( &self, endpoint: u8, data: &[u8], _timeout: Duration, ) -> Result<usize, U3vError>

Write data to the bulk OUT endpoint. Returns bytes written.

fn bulk_read( &self, endpoint: u8, buf: &mut [u8], _timeout: Duration, ) -> Result<usize, U3vError>

Read up to buf.len() bytes from the bulk IN endpoint. Returns the number of bytes actually read.