1 files changed, 52 insertions, 0 deletions
diff --git a/dom/base/test/gtest/TestParser.cpp b/dom/base/test/gtest/TestParser.cpp
new file mode 100644
index 0000000000..d9240cced7
--- /dev/null
+++ b/dom/base/test/gtest/TestParser.cpp
@@ -0,0 +1,52 @@
+/* -*- 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 "nsCOMPtr.h"
+#include "nsString.h"
+#include "mozilla/dom/DOMParser.h"
+#include "mozilla/dom/Document.h"
+#include "nsIDocumentEncoder.h"
+#include "mozilla/ErrorResult.h"
+
+// This is a test for mozilla::dom::DOMParser::CreateWithoutGlobal() which was
+// implemented for use in Thunderbird's MailNews module.
+
+// int main(int argc, char** argv)
+TEST(TestParser, TestParserMain)
+{
+  bool allTestsPassed = false;
+  constexpr auto htmlInput =
+      u"<html><head>"
+      "<meta http-equiv=\"content-type\" content=\"text/html; charset=\">"
+      "</head><body>Hello <b>Thunderbird!</b></body></html>"_ns;
+
+  do {
+    // Parse the HTML source.
+    mozilla::IgnoredErrorResult rv2;
+    RefPtr<mozilla::dom::DOMParser> parser =
+        mozilla::dom::DOMParser::CreateWithoutGlobal(rv2);
+    if (rv2.Failed()) break;
+    nsCOMPtr<mozilla::dom::Document> document = parser->ParseFromString(
+        htmlInput, mozilla::dom::SupportedType::Text_html, rv2);
+    if (rv2.Failed()) break;
+
+    // Serialize it back to HTML source again.
+    nsCOMPtr<nsIDocumentEncoder> encoder =
+        do_createDocumentEncoder("text/html");
+    if (!encoder) break;
+    nsresult rv =
+        encoder->Init(document, u"text/html"_ns, nsIDocumentEncoder::OutputRaw);
+    if (NS_FAILED(rv)) break;
+    nsString parsed;
+    rv = encoder->EncodeToString(parsed);
+    if (NS_FAILED(rv)) break;
+
+    EXPECT_TRUE(parsed.Equals(htmlInput));
+    allTestsPassed = true;
+  } while (false);
+
+  EXPECT_TRUE(allTestsPassed);
+}