Add a unit test for dumpHtml

We have no unit tests for this.  This isn't very extensive, but we
should have at least one.

Signed-off-by: Ed Tanous <edtanous@google.com>
Change-Id: I212ee528b354f2ed47f88076be009fd6e16fb760
diff --git a/meson.build b/meson.build
index 5405548..152a2fd 100644
--- a/meson.build
+++ b/meson.build
@@ -358,6 +358,7 @@
   'test/http/verb_test.cpp',
   'test/include/dbus_utility_test.cpp',
   'test/include/google/google_service_root_test.cpp',
+  'test/include/json_html_serializer.cpp',
   'test/include/http_utility_test.cpp',
   'test/include/human_sort_test.cpp',
   'test/include/ibm/configfile_test.cpp',