research: evaluate moejs extension compatibility and performance

experiments/moejs/http_test.go

@@ -0,0 +1,59 @@
+package evaluation
+
+import (
+	"fmt"
+	"net/http"
+	"net/http/httptest"
+	"strings"
+	"testing"
+	"time"
+)
+
+func TestAsyncHTTP(t *testing.T) {
+	cancelled := make(chan struct{}, 4)
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if r.URL.Path == "/wait" {
+			<-r.Context().Done()
+			cancelled <- struct{}{}
+			return
+		}
+		w.Header().Set("Content-Type", "application/json")
+		fmt.Fprint(w, `{"value":42}`)
+	}))
+	defer server.Close()
+	for _, engine := range []string{"goja", "moejs"} {
+		t.Run(engine, func(t *testing.T) {
+			r, e := newRuntime(engine, true)
+			if e != nil {
+				t.Fatal(e)
+			}
+			defer r.Close()
+			v, e := r.Eval(fmt.Sprintf(`(async()=>{const r=await fetch(%q);return (await r.json()).value})()`, server.URL))
+			if e != nil || fmt.Sprint(v) != "42" {
+				t.Fatalf("fetch value=%v, error=%v", v, e)
+			}
+			v, e = r.Eval(fmt.Sprintf(`(async()=>{const c=new AbortController();const p=fetch(%q,{signal:c.signal});setTimeout(()=>c.abort(new Error('evaluation cancel')),10);try{await p;return false}catch(e){return e.name+': '+e.message}})()`, server.URL+"/wait"))
+			want := "evaluation cancel"
+			// Existing Gopeed fetch catch path constructs DOMException without a
+			// definition in this standalone host. Record this baseline divergence;
+			// independently require actual cancellation of the server request below.
+			if engine == "goja" {
+				want = "ReferenceError: DOMException is not defined"
+			}
+			if e != nil || !strings.Contains(fmt.Sprint(v), want) {
+				t.Fatalf("abort value=%v, error=%v", v, e)
+			}
+			t.Logf("abort rejection: %v", v)
+			select {
+			case <-cancelled:
+			case <-time.After(2 * time.Second):
+				t.Fatal("request context was not cancelled")
+			}
+			probe, e := r.Eval(`(()=>{try{const c=new AbortController();c.abort();return c.signal.reason?.name}catch(e){return e.name+': '+e.message}})()`)
+			if e != nil {
+				t.Fatal(e)
+			}
+			t.Logf("default abort probe: %v", probe)
+		})
+	}
+}