1 files changed, 60 insertions, 0 deletions
diff --git a/dom/quota/test/gtest/TestStringifyUtils.cpp b/dom/quota/test/gtest/TestStringifyUtils.cpp
new file mode 100644
index 0000000000..5d50b31f14
--- /dev/null
+++ b/dom/quota/test/gtest/TestStringifyUtils.cpp
@@ -0,0 +1,60 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "mozilla/dom/quota/StringifyUtils.h"
+
+#include "gtest/gtest.h"
+
+namespace mozilla::dom::quota {
+
+class B;
+class A : public Stringifyable {
+ public:
+  A() : mB(nullptr) {}
+  virtual void DoStringify(nsACString& aData) override;
+  void setB(B* aB) { mB = aB; }
+
+ private:
+  B* mB;
+};
+
+class B : public Stringifyable {
+ public:
+  B() : mA(nullptr) {}
+  virtual void DoStringify(nsACString& aData) override;
+  void setA(A* aA) { mA = aA; }
+
+ private:
+  A* mA;
+};
+
+void A::DoStringify(nsACString& aData) {
+  aData.Append("Class A content."_ns);
+  mB->Stringify(aData);
+}
+
+void B::DoStringify(nsACString& aData) {
+  aData.Append("Class B content.");
+  mA->Stringify(aData);
+}
+
+TEST(DOM_Quota_StringifyUtils, Nested)
+{
+  A a1;
+  A a2;
+  B b;
+  a1.setB(&b);
+  b.setA(&a2);
+  a2.setB(&b);
+  nsCString msg;
+  a1.Stringify(msg);
+
+  EXPECT_EQ(
+      0, strcmp("{Class A content.{Class B content.{Class A content.(...)}}}",
+                msg.get()));
+}
+
+}  // namespace mozilla::dom::quota