Added async test to tests

tests/test_async.cpp

@@ -40,6 +40,26 @@ TEST_CASE("discard policy ", "[async]")
     REQUIRE(test_sink->msg_counter() < messages);
 }
 
+TEST_CASE("discard policy using factory ", "[async]")
+{
+    using namespace spdlog;
+    //auto test_sink = std::make_shared<sinks::test_sink_mt>();
+    size_t queue_size = 2;
+    size_t messages = 1024;
+    {
+        //auto tp = std::make_shared<details::thread_pool>(queue_size, 1);
+        auto logger = spdlog::create_async_nb<sinks::test_sink_mt>("as2");
+        for (size_t i = 0; i < messages; i++)
+        {
+            logger->info("Hello message #{}", i);
+        }
+        auto sink = std::static_pointer_cast<sinks::test_sink_mt>(logger->sinks()[0]);
+		REQUIRE(sink->msg_counter() < messages);
+    }
+
+    
+}
+
 TEST_CASE("flush", "[async]")
 {
     using namespace spdlog;