diff --git a/test/fuchsia/dune b/test/fuchsia/dune
new file mode 100644
index 0000000..087400b
--- /dev/null
+++ b/test/fuchsia/dune
@@ -0,0 +1,5 @@
+(test
+ (name t1)
+ (package trace-fuchsia)
+ (modules t1)
+ (libraries trace trace-fuchsia))
diff --git a/test/fuchsia/t1.ml b/test/fuchsia/t1.ml
new file mode 100644
index 0000000..83e55f3
--- /dev/null
+++ b/test/fuchsia/t1.ml
@@ -0,0 +1,48 @@
+let run () =
+  Trace.set_process_name "main";
+  Trace.set_thread_name "t1";
+
+  let n = ref 0 in
+
+  for _i = 1 to 50 do
+    Trace.with_span ~__FILE__ ~__LINE__ "outer.loop" @@ fun _sp ->
+    let pseudo_async_sp =
+      Trace.enter_manual_span ~parent:None ~__FILE__ ~__LINE__ "fake_sleep"
+    in
+
+    for _j = 2 to 5 do
+      incr n;
+      Trace.with_span ~__FILE__ ~__LINE__ "inner.loop" @@ fun _sp ->
+      Trace.messagef (fun k -> k "hello %d %d" _i _j);
+      Trace.message "world";
+      Trace.counter_int "n" !n;
+
+      Trace.add_data_to_span _sp [ "i", `Int _i ];
+
+      if _j = 2 then (
+        Trace.add_data_to_span _sp [ "j", `Int _j ];
+        let _sp =
+          Trace.enter_manual_span
+            ~parent:(Some (Trace.ctx_of_span pseudo_async_sp))
+            ~flavor:
+              (if _i mod 3 = 0 then
+                 `Sync
+               else
+                 `Async)
+            ~__FILE__ ~__LINE__ "sub-sleep"
+        in
+
+        (* fake micro sleep *)
+        Thread.delay 0.005;
+        Trace.exit_manual_span _sp
+      ) else if _j = 3 then (
+        (* pretend some task finished. Note that this is not well scoped wrt other spans. *)
+        Trace.add_data_to_manual_span pseudo_async_sp [ "slept", `Bool true ];
+        Trace.exit_manual_span pseudo_async_sp
+      )
+    done
+  done
+
+let () =
+  Trace_tef.Private_.mock_all_ ();
+  Trace_tef.with_setup ~out:`Stdout () @@ fun () -> run ()