added apply_al()l test to tests

tests/logs/daily_dateonly20160820.txt

+[2016-08-20 13:50:56.499] [logger] [info] Test message 0
+[2016-08-20 13:50:56.499] [logger] [info] Test message 1
+[2016-08-20 13:50:56.499] [logger] [info] Test message 2
+[2016-08-20 13:50:56.499] [logger] [info] Test message 3
+[2016-08-20 13:50:56.499] [logger] [info] Test message 4
+[2016-08-20 13:50:56.499] [logger] [info] Test message 5
+[2016-08-20 13:50:56.500] [logger] [info] Test message 6
+[2016-08-20 13:50:56.500] [logger] [info] Test message 7
+[2016-08-20 13:50:56.500] [logger] [info] Test message 8
+[2016-08-20 13:50:56.500] [logger] [info] Test message 9

tests/registry.cpp

 #include "includes.h"
 
 static const char *tested_logger_name = "null_logger";
+static const char *tested_logger_name2 = "null_logger2";
 
 TEST_CASE("register_drop", "[registry]")
 {
@@ -22,6 +23,30 @@ TEST_CASE("explicit register" "[registry]")
     REQUIRE_THROWS_AS(spdlog::create<spdlog::sinks::null_sink_mt>(tested_logger_name), spdlog::spdlog_ex);
 }
 
+TEST_CASE("apply_all" "[registry]")
+{
+	spdlog::drop_all();
+	auto logger = std::make_shared<spdlog::logger>(tested_logger_name, std::make_shared<spdlog::sinks::null_sink_st>());
+	spdlog::register_logger(logger);	
+	auto logger2 = std::make_shared<spdlog::logger>(tested_logger_name2, std::make_shared<spdlog::sinks::null_sink_st>());
+	spdlog::register_logger(logger2);
+
+	int counter = 0;
+	spdlog::apply_all([&counter](std::shared_ptr<spdlog::logger> l){counter++;});
+	REQUIRE(counter == 2);	
+
+	counter = 0;
+	spdlog::drop(tested_logger_name2);
+	spdlog::apply_all([&counter](std::shared_ptr<spdlog::logger> l)
+	{
+		REQUIRE(l->name() == tested_logger_name); 
+		counter++; }
+	);
+	REQUIRE(counter == 1);	
+}
+
+
+
 TEST_CASE("drop" "[registry]")
 {
     spdlog::drop_all();
@@ -34,10 +59,10 @@ TEST_CASE("drop_all" "[registry]")
 {
     spdlog::drop_all();
     spdlog::create<spdlog::sinks::null_sink_mt>(tested_logger_name);
-    spdlog::create<spdlog::sinks::null_sink_mt>("name2");
+    spdlog::create<spdlog::sinks::null_sink_mt>(tested_logger_name2);
     spdlog::drop_all();
     REQUIRE_FALSE(spdlog::get(tested_logger_name));
-    REQUIRE_FALSE(spdlog::get("name2"));
+    REQUIRE_FALSE(spdlog::get(tested_logger_name));
 }
 
 
@@ -51,3 +76,5 @@ TEST_CASE("drop non existing" "[registry]")
     spdlog::drop_all();
 }
 
+
+