wip(uts): tests

scripts/setupJestEnv.ts

@@ -10,8 +10,9 @@ let instanceId = 1
       invokeSync(args: Record<string, any>, callback: unknown) {
         console.log(`invoke`, JSON.stringify(args))
         if (args.name === 'constructor') {
-          return instanceId++
+          return { type: 'return', params: instanceId++ }
         }
+        return { type: 'return', params: null }
       },
       invokeAsync(args: unknown, callback: unknown) {
         console.log(`invokeAsync`, JSON.stringify(args))