diff --git a/test/system/test_config_item/config_item.cpp b/test/system/test_config_item/config_item.cpp
index 3bfd20ca2..d806a9411 100644
--- a/test/system/test_config_item/config_item.cpp
+++ b/test/system/test_config_item/config_item.cpp
@@ -13,28 +13,57 @@
 
 using namespace sensesp;
 
+// PersistingObservableValue saves itself on change
 void test_persisting_observable_value_schema() {
   SensESPMinimalAppBuilder builder;
   SensESPMinimalApp* sensesp_app = builder.get_app();
   TEST_ASSERT_NOT_NULL(sensesp_app);
 
+
   PersistingObservableValue<int> value{2, "/test"};
 
   auto config_item = ConfigItem(&value);
 
-  value.set(3);
-
   String ref_schema = R"###({"type":"object","properties":{"value":{"title":"Value","type":"number"}}})###";
   String schema = config_item->get_config_schema();
   ESP_LOGD("test_schema", "schema: %s", schema.c_str());
 
   TEST_ASSERT_EQUAL_STRING(ref_schema.c_str(), schema.c_str());
 
+  value.set(0);
   value.save();
-  value.set(4);
+
+  value.set(3);
   value.load();
 
   TEST_ASSERT_EQUAL(3, value.get());
+
+  value.set(4);
+  value.load();
+
+  TEST_ASSERT_EQUAL(4, value.get());
+
+  JsonDocument doc;
+  JsonObject root = doc.to<JsonObject>();
+  bool result = value.to_json(root);
+  TEST_ASSERT_TRUE(result);
+
+  String json_str;
+  serializeJson(doc, json_str);
+
+  String ref_json = R"###({"value":4})###";
+
+  TEST_ASSERT_EQUAL_STRING(ref_json.c_str(), json_str.c_str());
+
+  String json_input = R"###({"value":5})###";
+
+  DeserializationError error = deserializeJson(doc, json_input);
+  TEST_ASSERT_TRUE(error == DeserializationError::Ok);
+
+  result = value.from_json(doc.as<JsonObject>());
+  TEST_ASSERT_TRUE(result);
+
+  TEST_ASSERT_EQUAL(5, value.get());
 }
 
 void setup() {