Add integration test showing that the Crazyflie object cannot be sent…

… between threads

tests/syncsend_test.rs

@@ -0,0 +1,27 @@
+// Test that the Crazyflie object can be sent between threads
+
+use std::thread::spawn;
+use crazyflie_lib::Crazyflie;
+
+#[async_std::test]
+async fn crazyflie_can_be_sent_to_thread() -> Result<(), Box<dyn std::error::Error>> {
+    let link_context = crazyflie_link::LinkContext::new(async_executors::AsyncStd);
+
+    // Scan for Crazyflies on the default address
+    let found = link_context.scan([0xE7; 5]).await?;
+
+    if let Some(uri) = found.first() {
+        // Connect to the first Crazyflie found
+        let cf = crazyflie_lib::Crazyflie::connect_from_uri(
+            async_executors::AsyncStd,
+            &link_context,
+            uri,
+        )
+        .await?;
+
+        let _ = spawn(move || {
+            cf
+        }).join().unwrap();
+    }
+    Ok(())
+}