diff --git a/tests/test_pattern_formatter.cpp b/tests/test_pattern_formatter.cpp
index 5c2be1f2..644cb80e 100644
--- a/tests/test_pattern_formatter.cpp
+++ b/tests/test_pattern_formatter.cpp
@@ -7,8 +7,10 @@ static std::string log_to_str(const std::string &msg, const std::shared_ptr<spdl
     auto oss_sink = std::make_shared<spdlog::sinks::ostream_sink_mt>(oss);
     spdlog::logger oss_logger("pattern_tester", oss_sink);
     oss_logger.set_level(spdlog::level::info);
-    if (formatter)
-        oss_logger.set_formatter(formatter);
+	if (formatter)
+	{
+		oss_logger.set_formatter(formatter);
+	}
     oss_logger.info(msg);
     return oss.str();
 }
@@ -61,3 +63,62 @@ TEST_CASE("date MM/DD/YY ", "[pattern_formatter]")
         << (now_tm.tm_year + 1900) % 1000 << " Some message\n";
     REQUIRE(log_to_str("Some message", formatter) == oss.str());
 }
+
+TEST_CASE("color range test1", "[pattern_formatter]")
+{	
+	auto formatter = std::make_shared<spdlog::pattern_formatter>("%^%v%$", spdlog::pattern_time_type::local, "\n");
+	spdlog::details::log_msg msg;
+	msg.raw << "Hello";
+	formatter->format(msg);
+	REQUIRE(msg.color_range_start == 0);
+	REQUIRE(msg.color_range_end == 5);	
+	REQUIRE(log_to_str("hello", formatter) == "hello\n");
+}
+
+TEST_CASE("color range test2", "[pattern_formatter]")
+{
+	auto formatter = std::make_shared<spdlog::pattern_formatter>("%^%$", spdlog::pattern_time_type::local, "\n");
+	spdlog::details::log_msg msg;	
+	formatter->format(msg);
+	REQUIRE(msg.color_range_start == 0);
+	REQUIRE(msg.color_range_end == 0);
+	REQUIRE(log_to_str("", formatter) == "\n");
+}
+
+TEST_CASE("color range test3", "[pattern_formatter]")
+{
+	auto formatter = std::make_shared<spdlog::pattern_formatter>("%^***%$");
+	spdlog::details::log_msg msg;
+	formatter->format(msg);
+	REQUIRE(msg.color_range_start == 0);
+	REQUIRE(msg.color_range_end == 3);
+}
+
+TEST_CASE("color range test4", "[pattern_formatter]")
+{
+	auto formatter = std::make_shared<spdlog::pattern_formatter>("XX%^YYY%$", spdlog::pattern_time_type::local, "\n");
+	spdlog::details::log_msg msg;
+	msg.raw << "ignored";
+	formatter->format(msg);
+	REQUIRE(msg.color_range_start == 2);
+	REQUIRE(msg.color_range_end == 5);
+	REQUIRE(log_to_str("ignored", formatter) == "XXYYY\n");
+}
+
+TEST_CASE("color range test5", "[pattern_formatter]")
+{
+	auto formatter = std::make_shared<spdlog::pattern_formatter>("**%^");
+	spdlog::details::log_msg msg;
+	formatter->format(msg);
+	REQUIRE(msg.color_range_start == 2);
+	REQUIRE(msg.color_range_end == 0);
+}
+
+TEST_CASE("color range test6", "[pattern_formatter]")
+{
+	auto formatter = std::make_shared<spdlog::pattern_formatter>("**%$");
+	spdlog::details::log_msg msg;
+	formatter->format(msg);
+	REQUIRE(msg.color_range_start == 0);
+	REQUIRE(msg.color_range_end == 2);
+}