✅ zb: Add unixexec connection test case

zbus/tests/unixexec.rs

@@ -0,0 +1,34 @@
+use ntest::timeout;
+use test_log::test;
+
+use zbus::{block_on, conn::Builder, Result};
+
+#[test]
+#[timeout(15000)]
+fn unixexec_connection_async() {
+    block_on(test_unixexec_connection()).unwrap();
+}
+
+async fn test_unixexec_connection() -> Result<()> {
+    let connection = Builder::address("unixexec:path=systemd-stdio-bridge")?
+        .build()
+        .await?;
+
+    match connection
+        .call_method(
+            Some("org.freedesktop.DBus"),
+            "/org/freedesktop/DBus",
+            Some("org.freedesktop.DBus"),
+            "Hello",
+            &(),
+        )
+        .await
+    {
+        Err(zbus::Error::MethodError(_, _, _)) => (),
+        Err(e) => panic!("{}", e),
+
+        _ => panic!(),
+    };
+
+    Ok(())
+}