added script support in remote browser script

Signed-off-by: RonniSkansing <rskansing@gmail.com>

backend/script/callable_test.go

@@ -0,0 +1,54 @@
+package script
+
+import (
+	"context"
+	"fmt"
+	"testing"
+)
+
+// TestRunCallable proves callable mode: input flows in, the returned object
+// flows out.
+func TestRunCallable(t *testing.T) {
+	r := newTestRunner()
+	out, err := r.RunCallable(
+		context.Background(),
+		`return { doubled: input.n * 2, who: input.who };`,
+		map[string]interface{}{"n": 21, "who": "alice"},
+	)
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if fmt.Sprint(out["doubled"]) != "42" {
+		t.Fatalf("doubled = %v, want 42", out["doubled"])
+	}
+	if out["who"] != "alice" {
+		t.Fatalf("who = %v, want alice", out["who"])
+	}
+}
+
+// TestRunCallableStop proves stop() is a clean exit with no output.
+func TestRunCallableStop(t *testing.T) {
+	r := newTestRunner()
+	out, err := r.RunCallable(context.Background(), `stop();`, nil)
+	if err != nil || out != nil {
+		t.Fatalf("stop() should be a clean nil exit, got out=%v err=%v", out, err)
+	}
+}
+
+// TestRunCallableNonObject proves a non-object return is an error.
+func TestRunCallableNonObject(t *testing.T) {
+	r := newTestRunner()
+	if _, err := r.RunCallable(context.Background(), `return 5;`, nil); err == nil {
+		t.Fatalf("expected an error for a non-object return")
+	}
+}
+
+// TestRunCallableEmitEventUnavailable proves campaign bindings are inert in
+// callable mode (emitEvent throws, surfacing as an error).
+func TestRunCallableEmitEventUnavailable(t *testing.T) {
+	r := newTestRunner()
+	if _, err := r.RunCallable(context.Background(),
+		`emitEvent('campaign_recipient_submitted_data', {});`, nil); err == nil {
+		t.Fatalf("expected emitEvent to be unavailable in callable mode")
+	}
+}