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#![allow(missing_docs)]
use std::io::{self, Cursor, Read, Write};
use std::sync::{Arc, Mutex};
pub type MockCursor = Cursor<Vec<u8>>;
#[derive(Clone, Debug)]
pub struct MockStream {
reader: Arc<Mutex<MockCursor>>,
writer: Arc<Mutex<MockCursor>>,
}
impl Default for MockStream {
fn default() -> Self {
Self::new()
}
}
impl MockStream {
pub fn new() -> MockStream {
MockStream {
reader: Arc::new(Mutex::new(MockCursor::new(Vec::new()))),
writer: Arc::new(Mutex::new(MockCursor::new(Vec::new()))),
}
}
pub fn with_vec(vec: Vec<u8>) -> MockStream {
MockStream {
reader: Arc::new(Mutex::new(MockCursor::new(vec))),
writer: Arc::new(Mutex::new(MockCursor::new(Vec::new()))),
}
}
pub fn take_vec(&mut self) -> Vec<u8> {
let mut cursor = self.writer.lock().unwrap();
let vec = cursor.get_ref().to_vec();
cursor.set_position(0);
cursor.get_mut().clear();
vec
}
pub fn next_vec(&mut self, vec: &[u8]) {
let mut cursor = self.reader.lock().unwrap();
cursor.set_position(0);
cursor.get_mut().clear();
cursor.get_mut().extend_from_slice(vec);
}
pub fn swap(&mut self) {
let mut cur_write = self.writer.lock().unwrap();
let mut cur_read = self.reader.lock().unwrap();
let vec_write = cur_write.get_ref().to_vec();
let vec_read = cur_read.get_ref().to_vec();
cur_write.set_position(0);
cur_read.set_position(0);
cur_write.get_mut().clear();
cur_read.get_mut().clear();
cur_read.get_mut().extend_from_slice(vec_write.as_slice());
cur_write.get_mut().extend_from_slice(vec_read.as_slice());
}
}
impl Write for MockStream {
fn write(&mut self, msg: &[u8]) -> io::Result<usize> {
self.writer.lock().unwrap().write(msg)
}
fn flush(&mut self) -> io::Result<()> {
self.writer.lock().unwrap().flush()
}
}
impl Read for MockStream {
fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
self.reader.lock().unwrap().read(buf)
}
}
#[cfg(test)]
mod test {
use super::MockStream;
use std::io::{Read, Write};
#[test]
fn write_take_test() {
let mut mock = MockStream::new();
mock.write(&[1, 2, 3]).unwrap();
assert_eq!(mock.take_vec(), vec![1, 2, 3]);
}
#[test]
fn read_with_vec_test() {
let mut mock = MockStream::with_vec(vec![4, 5]);
let mut vec = Vec::new();
mock.read_to_end(&mut vec).unwrap();
assert_eq!(vec, vec![4, 5]);
}
#[test]
fn clone_test() {
let mut mock = MockStream::new();
let mut cloned = mock.clone();
mock.write(&[6, 7]).unwrap();
assert_eq!(cloned.take_vec(), vec![6, 7]);
}
#[test]
fn swap_test() {
let mut mock = MockStream::new();
let mut vec = Vec::new();
mock.write(&[8, 9, 10]).unwrap();
mock.swap();
mock.read_to_end(&mut vec).unwrap();
assert_eq!(vec, vec![8, 9, 10]);
}
}