1 files changed, 77 insertions, 0 deletions
diff --git a/dom/l10n/tests/gtest/TestL10nOverlays.cpp b/dom/l10n/tests/gtest/TestL10nOverlays.cpp
new file mode 100644
index 0000000000..c6c9da9939
--- /dev/null
+++ b/dom/l10n/tests/gtest/TestL10nOverlays.cpp
@@ -0,0 +1,77 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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 "gtest/gtest.h"
+#include "mozilla/dom/L10nOverlays.h"
+#include "mozilla/dom/Document.h"
+#include "mozilla/dom/L10nOverlaysBinding.h"
+#include "mozilla/dom/Element.h"
+#include "mozilla/NullPrincipal.h"
+#include "nsNetUtil.h"
+
+using mozilla::NullPrincipal;
+using namespace mozilla::dom;
+
+static already_AddRefed<Document> SetUpDocument() {
+  nsCOMPtr<nsIURI> uri;
+  NS_NewURI(getter_AddRefs(uri), "about:blank");
+  nsCOMPtr<nsIPrincipal> principal =
+      NullPrincipal::CreateWithoutOriginAttributes();
+  nsCOMPtr<Document> document;
+  nsresult rv = NS_NewDOMDocument(getter_AddRefs(document),
+                                  u""_ns,   // aNamespaceURI
+                                  u""_ns,   // aQualifiedName
+                                  nullptr,  // aDoctype
+                                  uri, uri, principal,
+                                  false,    // aLoadedAsData
+                                  nullptr,  // aEventObject
+                                  DocumentFlavorHTML);
+
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return nullptr;
+  }
+  return document.forget();
+}
+
+/**
+ * This test verifies that the basic C++ DOM L10nOverlays API
+ * works correctly.
+ */
+TEST(DOM_L10n_Overlays, Initial)
+{
+  mozilla::ErrorResult rv;
+
+  // 1. Set up an HTML document.
+  nsCOMPtr<Document> doc = SetUpDocument();
+
+  // 2. Create a simple Element with a child.
+  //
+  //   <div>
+  //     <a data-l10n-name="link" href="https://www.mozilla.org"></a>
+  //   </div>
+  //
+  RefPtr<Element> elem = doc->CreateHTMLElement(nsGkAtoms::div);
+  RefPtr<Element> span = doc->CreateHTMLElement(nsGkAtoms::a);
+  span->SetAttribute(u"data-l10n-name"_ns, u"link"_ns, rv);
+  span->SetAttribute(u"href"_ns, u"https://www.mozilla.org"_ns, rv);
+  elem->AppendChild(*span, rv);
+
+  // 3. Create an L10nMessage with a translation for the element.
+  L10nMessage translation;
+  translation.mValue.AssignLiteral(
+      "Hello <a data-l10n-name=\"link\">World</a>.");
+
+  // 4. Translate the element.
+  nsTArray<L10nOverlaysError> errors;
+  L10nOverlays::TranslateElement(*elem, translation, errors, rv);
+
+  nsAutoString textContent;
+  elem->GetInnerHTML(textContent, rv);
+
+  // 5. Verify that the innerHTML matches the expectations.
+  ASSERT_STREQ(NS_ConvertUTF16toUTF8(textContent).get(),
+               "Hello <a data-l10n-name=\"link\" "
+               "href=\"https://www.mozilla.org\">World</a>.");
+}