json_serializer: add tests

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I717b01ac4f69b9b086a4853cb28bb4c27d1f784b
diff --git a/test/meson.build b/test/meson.build
index adb9651..e544958 100644
--- a/test/meson.build
+++ b/test/meson.build
@@ -48,6 +48,17 @@
 )
 
 test(
+    'json_serializer_test',
+    executable(
+        'json_serializer_test',
+        'json_serializer_test.cpp',
+        include_directories: '..',
+        dependencies: [gtest_dep, gmock_dep, user_manager_dep],
+    ),
+)
+
+
+test(
     'execute_cmd_test',
     executable(
         'execute_cmd_test',