Define Transport trait, TransportAcceptor trait, TransportInfo, and TransportKind types

crates/wraith-core/tests/auth_tests.rs

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+#[tokio::test]
+async fn auth_placeholder() {}

crates/wraith-core/tests/client_tests.rs

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+#[tokio::test]
+async fn client_placeholder() {}

crates/wraith-core/tests/server_tests.rs

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+#[tokio::test]
+async fn server_placeholder() {}

crates/wraith-core/tests/transport_tests.rs

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+use wraith_core::testutil::{MockTransport, MockTransportAcceptor, Transport, TransportAcceptor, mock_pair};
+
+#[tokio::test]
+async fn mock_transport_connect() {
+    let transport = MockTransport::new(1024);
+    let stream = transport.connect().await.unwrap();
+    drop(stream);
+}
+
+#[tokio::test]
+async fn mock_transport_acceptor_accept() {
+    let acceptor = MockTransportAcceptor::new(1024);
+    let (stream, info) = acceptor.accept().await.unwrap();
+    drop(stream);
+    drop(info);
+}
+
+#[tokio::test]
+async fn mock_pair_communicates() {
+    let (mut client, mut server) = mock_pair(1024);
+    use tokio::io::{AsyncReadExt, AsyncWriteExt};
+    client.write_all(b"hello").await.unwrap();
+    let mut buf = [0u8; 5];
+    server.read_exact(&mut buf).await.unwrap();
+    assert_eq!(&buf, b"hello");
+}