Added bactrace tests

tests/CMakeLists.txt

@@ -23,7 +23,8 @@ set(SPDLOG_UTESTS_SOURCES
     test_sink.h
     test_fmt_helper.cpp
   	test_stdout_api.cpp
-    test_dup_filter.cpp)
+    test_dup_filter.cpp
+	test_backtrace.cpp)
 
 if(NOT SPDLOG_NO_EXCEPTIONS)
 	list(APPEND SPDLOG_UTESTS_SOURCES test_errors.cpp)

tests/test_backtrace.cpp

+#include "includes.h"
+#include "test_sink.h"
+
+
+
+
+TEST_CASE("bactrace1", "[bactrace]")
+{
+
+	using spdlog::sinks::test_sink_st;	
+	auto test_sink = std::make_shared<test_sink_st>();
+	int backtrace_size = 5;
+
+	spdlog::logger logger("test", test_sink);
+	logger.set_pattern("%v");
+	logger.enable_backtrace(backtrace_size);
+
+	logger.info("info message");   
+	for(int i = 0; i < 100; i++)
+		logger.debug("debug message {}", i);
+	
+	REQUIRE(test_sink->lines().size() == 1);
+	REQUIRE(test_sink->lines()[0] == "info message");
+
+	logger.dump_backtrace();
+	REQUIRE(test_sink->lines().size() == 8);	
+	REQUIRE(test_sink->lines()[1] == "****************** Backtrace Start ******************");	
+	
+	for(int i = 0; i < backtrace_size; i++)
+	{
+		REQUIRE(test_sink->lines()[i+2] == fmt::format("debug message {}", 100 - backtrace_size + i));
+	}
+	REQUIRE(test_sink->lines()[7] == "****************** Backtrace End ********************");
+		
+}
+

tests/test_sink.h

@@ -18,6 +18,7 @@ namespace sinks {
 template<class Mutex>
 class test_sink : public base_sink<Mutex>
 {
+	const size_t lines_to_save = 100;
 public:
     size_t msg_counter()
     {
@@ -33,23 +34,29 @@ public:
 
     void set_delay(std::chrono::milliseconds delay)
     {
+		std::lock_guard<Mutex> lock(base_sink<Mutex>::mutex_);
         delay_ = delay;
     }
 
 	// return last output without the eol
-	std::string last_output()
+	std::vector<std::string> lines()
 	{
 		std::lock_guard<Mutex> lock(base_sink<Mutex>::mutex_);
-		auto eol_len = strlen(spdlog::details::os::default_eol);
-		return std::string(last_output_.begin(),  last_output_.end() - eol_len);
+		return lines_;
 	}
 	
+
 protected:
     void sink_it_(const details::log_msg &msg) override
     {        	
 		fmt::memory_buffer formatted;
 	    base_sink<Mutex>::formatter_->format(msg, formatted);
-		last_output_.assign(formatted.begin(), formatted.end());
+		// save the line without the eol
+		auto eol_len = strlen(details::os::default_eol);
+		if(lines_.size() < lines_to_save)
+		{
+			lines_.emplace_back(formatted.begin(), formatted.end()-eol_len);		
+		}
 		msg_counter_++;
         std::this_thread::sleep_for(delay_);		
     }
@@ -62,7 +69,7 @@ protected:
     size_t msg_counter_{0};
     size_t flush_counter_{0};
     std::chrono::milliseconds delay_{std::chrono::milliseconds::zero()};
-	std::string last_output_;
+	std::vector<std::string> lines_;
 };
 
 using test_sink_mt = test_sink<std::mutex>;