add missing lib

lib/ArduinoJson/test/JsonObject/get.cpp

@@ -0,0 +1,19 @@
+// ArduinoJson - arduinojson.org
+// Copyright Benoit Blanchon 2014-2018
+// MIT License
+
+#include <ArduinoJson.h>
+#include <catch.hpp>
+
+using namespace Catch::Matchers;
+
+TEST_CASE("JsonObject::get()") {
+  DynamicJsonBuffer jb;
+  JsonObject& obj = jb.createObject();
+
+  SECTION("GetConstCharPointer_GivenStringLiteral") {
+    obj.set("hello", "world");
+    const char* value = obj.get<const char*>("hello");
+    REQUIRE_THAT(value, Equals("world"));
+  }
+}