test: checks on napi factory wrap’s finalization

test/addons-napi/7_factory_wrap/binding.cc

@@ -15,9 +15,14 @@ napi_value CreateObject(napi_env env, napi_callback_info info) {
 napi_value Init(napi_env env, napi_value exports) {
   NAPI_CALL(env, MyObject::Init(env));
 
-  NAPI_CALL(env,
-      // NOLINTNEXTLINE (readability/null_usage)
-      napi_create_function(env, "exports", -1, CreateObject, NULL, &exports));
+  napi_property_descriptor descriptors[] = {
+    DECLARE_NAPI_GETTER("finalizeCount", MyObject::GetFinalizeCount),
+    DECLARE_NAPI_PROPERTY("createObject", CreateObject),
+  };
+
+  NAPI_CALL(env, napi_define_properties(
+      env, exports, sizeof(descriptors) / sizeof(*descriptors), descriptors));
+
   return exports;
 }
 

test/addons-napi/7_factory_wrap/myobject.cc

@@ -1,17 +1,26 @@
 #include "myobject.h"
 #include "../common.h"
 
+static int finalize_count = 0;
+
 MyObject::MyObject() : env_(nullptr), wrapper_(nullptr) {}
 
 MyObject::~MyObject() { napi_delete_reference(env_, wrapper_); }
 
 void MyObject::Destructor(napi_env env,
                           void* nativeObject,
                           void* /*finalize_hint*/) {
+  ++finalize_count;
   MyObject* obj = static_cast<MyObject*>(nativeObject);
   delete obj;
 }
 
+napi_value MyObject::GetFinalizeCount(napi_env env, napi_callback_info info) {
+  napi_value result;
+  NAPI_CALL(env, napi_create_int32(env, finalize_count, &result));
+  return result;
+}
+
 napi_ref MyObject::constructor;
 
 napi_status MyObject::Init(napi_env env) {

test/addons-napi/7_factory_wrap/myobject.h

@@ -7,6 +7,7 @@ class MyObject {
  public:
   static napi_status Init(napi_env env);
   static void Destructor(napi_env env, void* nativeObject, void* finalize_hint);
+  static napi_value GetFinalizeCount(napi_env env, napi_callback_info info);
   static napi_status NewInstance(napi_env env,
                                  napi_value arg,
                                  napi_value* instance);

test/addons-napi/7_factory_wrap/test.js

@@ -1,14 +1,25 @@
 'use strict';
+// Flags: --expose-gc
+
 const common = require('../../common');
 const assert = require('assert');
-const createObject = require(`./build/${common.buildType}/binding`);
+const test = require(`./build/${common.buildType}/binding`);
 
-const obj = createObject(10);
-assert.strictEqual(obj.plusOne(), 11);
-assert.strictEqual(obj.plusOne(), 12);
-assert.strictEqual(obj.plusOne(), 13);
+assert.strictEqual(test.finalizeCount, 0);
+(() => {
+  const obj = test.createObject(10);
+  assert.strictEqual(obj.plusOne(), 11);
+  assert.strictEqual(obj.plusOne(), 12);
+  assert.strictEqual(obj.plusOne(), 13);
+})();
+global.gc();
+assert.strictEqual(test.finalizeCount, 1);
 
-const obj2 = createObject(20);
-assert.strictEqual(obj2.plusOne(), 21);
-assert.strictEqual(obj2.plusOne(), 22);
-assert.strictEqual(obj2.plusOne(), 23);
+(() => {
+  const obj2 = test.createObject(20);
+  assert.strictEqual(obj2.plusOne(), 21);
+  assert.strictEqual(obj2.plusOne(), 22);
+  assert.strictEqual(obj2.plusOne(), 23);
+})();
+global.gc();
+assert.strictEqual(test.finalizeCount, 2);

test/addons-napi/8_passing_wrapped/test.js

@@ -6,11 +6,12 @@ const assert = require('assert');
 const addon = require(`./build/${common.buildType}/binding`);
 
 let obj1 = addon.createObject(10);
-const obj2 = addon.createObject(20);
+let obj2 = addon.createObject(20);
 const result = addon.add(obj1, obj2);
 assert.strictEqual(result, 30);
 
 // Make sure the native destructor gets called.
 obj1 = null;
+obj2 = null;
 global.gc();
-assert.strictEqual(addon.finalizeCount(), 1);
+assert.strictEqual(addon.finalizeCount(), 2);