Added test of pattern_formatter::clone()

tests/test_pattern_formatter.cpp

@@ -209,6 +209,20 @@ TEST_CASE("clone-default-formatter", "[pattern_formatter]")
     formatter_1->format(msg, formatted_1);
     formatter_2->format(msg, formatted_2);
 
+    REQUIRE( fmt::to_string(formatted_1) == fmt::to_string(formatted_2));
+}
+
+TEST_CASE("clone-default-formatter2", "[pattern_formatter]")
+{
+    auto formatter_1 = std::make_shared<spdlog::pattern_formatter>("%+");
+    auto formatter_2 = formatter_1->clone();
+    std::string logger_name = "test";
+    spdlog::details::log_msg msg(&logger_name, spdlog::level::info, "some message");
+
+    fmt::memory_buffer formatted_1;
+    fmt::memory_buffer formatted_2;
+    formatter_1->format(msg, formatted_1);
+    formatter_2->format(msg, formatted_2);
 
     REQUIRE( fmt::to_string(formatted_1) == fmt::to_string(formatted_2));
 }