[promisehook] Fire init hook for promise subclass

test/cctest/test-api.cc

Index: test/cctest/test-api.cc
diff --git a/test/cctest/test-api.cc b/test/cctest/test-api.cc
index cb28aadc9b7cbebbcab06e1dcbb458c179d7d221..f25bd3bee21ab80449243ff24f21d02ff5dcbdf7 100644
--- a/test/cctest/test-api.cc
+++ b/test/cctest/test-api.cc
@@ -18426,7 +18426,40 @@ TEST(PromiseHook) {
                      v8_str(promise_hook_data->promise_hook_value.c_str()))
             .FromJust());
 
+  promise_hook_data->Reset();
+  promise_hook_data->promise_hook_value = "subclass";
+  source =
+      "var resolve, value = '';\n"
+      "class MyPromise extends Promise { \n"
+      "  then(onFulfilled, onRejected) { \n"
+      "      return super.then(onFulfilled, onRejected); \n"
+      "  };\n"
+      "};\n"
+      "var p = new MyPromise(r => resolve = r);\n";
+
+  CompileRun(source);
+  // 1) init hook (p)
+  CHECK_EQ(1, promise_hook_data->promise_hook_count);
+
+  CompileRun("var p1 = p.then(() => value = 'subclass');\n");
+  // 2) init hook (p1)
+  CHECK_EQ(2, promise_hook_data->promise_hook_count);
+
+  CompileRun("resolve();\n");
+  resolve_promise = global->Get(context, v8_str("resolve")).ToLocalChecked();
+  before_promise = global->Get(context, v8_str("before")).ToLocalChecked();
+  after_promise = global->Get(context, v8_str("after")).ToLocalChecked();
+  CHECK(GetPromise("p")->Equals(env.local(), before_promise).FromJust());
+  CHECK(GetPromise("p")->Equals(env.local(), after_promise).FromJust());
+  CHECK(GetPromise("p1")->Equals(env.local(), resolve_promise).FromJust());
+  // 3) resolve hook (p)
+  // 4) before hook (p)
+  // 5) after hook (p)
+  // 6) resolve hook (p1)
+  CHECK_EQ(6, promise_hook_data->promise_hook_count);
+
   delete promise_hook_data;
+  isolate->SetPromiseHook(nullptr);
 }
 
 void AnalyzeStackOfDynamicScriptWithSourceURL(