add ping-pong Go tests

Signed-off-by: Joel Dice <joel.dice@fermyon.com>

Author: dicej

tests/runtime-async/async/ping-pong/runner.go

@@ -0,0 +1,69 @@
+package main
+
+import (
+	"fmt"
+	test "wit_component/my_test_i"
+	"wit_component/wit_async"
+	"wit_component/wit_types"
+)
+
+type Unit struct{}
+
+//go:wasmimport [export]wasi:cli/run@0.3.0-rc-2025-09-16 [task-return]run
+func taskReturn(result int32)
+
+//go:wasmexport [async-lift]wasi:cli/run@0.3.0-rc-2025-09-16#run
+func run() uint32 {
+	return wit_async.Run(func() {
+		{
+			f1 := make(chan *wit_types.FutureReader[string])
+			f2 := make(chan Unit)
+
+			tx, rx := test.MakeFutureString()
+			go func() {
+				f1 <- test.Ping(rx, "world")
+			}()
+
+			go func() {
+				tx.Write("hello")
+				f2 <- Unit{}
+			}()
+
+			(<-f2)
+			rx2 := (<-f1)
+			assertEqual(rx2.Read(), "helloworld")
+		}
+
+		{
+			f1 := make(chan Unit)
+			f2 := make(chan Unit)
+
+			tx, rx := test.MakeFutureString()
+			go func() {
+				assertEqual(test.Pong(rx), "helloworld")
+				f1 <- Unit{}
+			}()
+
+			go func() {
+				tx.Write("helloworld")
+				f2 <- Unit{}
+			}()
+
+			(<-f2)
+			(<-f1)
+		}
+
+		taskReturn(0)
+	})
+}
+
+//go:wasmexport [callback][async-lift]wasi:cli/run@0.3.0-rc-2025-09-16#run
+func callback(event0 uint32, event1 uint32, event2 uint32) uint32 {
+	return wit_async.Callback(event0, event1, event2)
+}
+
+func assertEqual[T comparable](a, b T) {
+	if a != b {
+		panic(fmt.Sprintf("%v not equal to %v", a, b))
+	}
+}

tests/runtime-async/async/ping-pong/test.go

@@ -0,0 +1,19 @@
+package export_my_test_i
+
+import (
+	"wit_component/my_test_i"
+	. "wit_component/wit_types"
+)
+
+func Ping(x *FutureReader[string], y string) *FutureReader[string] {
+	message := x.Read() + y
+	tx, rx := my_test_i.MakeFutureString()
+	go func() {
+		tx.Write(message)
+	}()
+	return rx
+}
+
+func Pong(x *FutureReader[string]) string {
+	return x.Read()
+}