Bug 1351635 - Return isClassConstructor in class grip. r=loganfsmyth.

A test is added to ensure isClassConstructor has the expected
value for ES6 class grips.

Differential Revision: https://phabricator.services.mozilla.com/D50962

--HG--
extra : moz-landing-system : lando

devtools/server/actors/object.js

@@ -255,6 +255,10 @@ const proto = {
       g.promiseState = this._createPromiseState();
     }
 
+    if (g.class == "Function") {
+      g.isClassConstructor = this.obj.isClassConstructor;
+    }
+
     const raw = this.getRawObject();
     this._populateGripPreview(g, raw);
     this.hooks.decrementGripDepth();

devtools/server/tests/unit/test_objectgrips-23.js

@@ -0,0 +1,43 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+// Test that ES6 classes grip have the expected properties.
+
+"use strict";
+
+Services.prefs.setBoolPref("security.allow_eval_with_system_principal", true);
+registerCleanupFunction(() => {
+  Services.prefs.clearUserPref("security.allow_eval_with_system_principal");
+});
+
+add_task(
+  threadFrontTest(async ({ threadFront, debuggee }) => {
+    await new Promise(function(resolve) {
+      threadFront.once("paused", async function(packet) {
+        const [grip] = packet.frame.arguments;
+        strictEqual(
+          grip.class,
+          "Function",
+          `Grip has expected value for "class" property`
+        );
+        strictEqual(
+          grip.isClassConstructor,
+          true,
+          `Grip has expected value for "isClassConstructor" property`
+        );
+
+        await threadFront.resume();
+        resolve();
+      });
+
+      debuggee.eval(`
+        class MyClass {};
+        stopMe(MyClass);
+
+        function stopMe(arg1) {
+          debugger;
+        }
+      `);
+    });
+  })
+);

devtools/server/tests/unit/xpcshell.ini

@@ -161,6 +161,7 @@ skip-if = true # breakpoint sliding is not supported bug 1525685
 [test_objectgrips-20.js]
 [test_objectgrips-21.js]
 [test_objectgrips-22.js]
+[test_objectgrips-23.js]
 [test_objectgrips-array-like-object.js]
 [test_objectgrips-property-value-01.js]
 [test_objectgrips-property-value-02.js]