diff --git a/include/Colors.hpp b/include/Colors.hpp
new file mode 100644
index 0000000..43aabda
--- /dev/null
+++ b/include/Colors.hpp
@@ -0,0 +1,144 @@
+#ifndef COLORS_HPP
+#define COLRS_HPP
+
+
+// http://www.linux.gr/cgi-bin/man2html?console_codes+4
+
+
+/// Formatters:
+
+/// 1 set bold
+#define F_BOLD "1"
+
+/// 2 set half-bright (simulated with color on a color display)
+#define F_HALF_BRIGHT "2"
+
+/// 4 set underscore (simulated with color on a color display)
+/// (the colors used to simulate dim or underline are set using ESC ] ...)
+#define F_UNDERSCORE "4"
+
+/// 5 set blink
+#define F_BLINK "5"
+
+/// 7 set reverse video
+#define F_REVERSE_COLORS "7"
+
+/// 10  reset selected mapping, display control flag, and toggle meta flag
+/// (ECMA-48 says "primary font").
+#define F_PRIMARY_FONT "10"
+
+/// 11  select null mapping, set display control flag, reset toggle meta flag
+/// (ECMA-48 says "first alternate font").
+#define F_FIRST_ALTERNATE_FONT "11"
+
+/// 12  select null mapping, set display control flag, set toggle meta flag
+/// (ECMA-48 says "second alternate font").
+/// The toggle meta flag causes the high bit of a byte to be toggled
+/// before the mapping table translation is done.
+#define F_SECOND_ALTERNATE_FONT "12"
+
+/// 21  set normal intensity (ECMA-48 says "doubly underlined")
+#define F_DOUBLY_UNDERLINED "21"
+
+/// 22  set normal intensity
+#define F_NORMAL_INTENSITY "22"
+
+/// 24  underline off
+#define F_UNDERLINE_OFF "24"
+
+/// 25  blink off
+#define F_BLINK_OFF "25"
+
+/// 27  reverse video off
+#define F_REVERSE_VIDEO_OFF "27"
+
+
+
+/// Foregrounds:
+
+/// 30  set black foreground
+#define FG_BLACK "30"
+
+/// 31  set red foreground
+#define FG_RED "31"
+
+/// 32  set green foreground
+#define FG_GREEN "32"
+
+/// 33  set brown foreground
+#define FG_BROWN "33"
+
+/// 34  set blue foreground
+#define FG_BLUE "34"
+
+/// 35  set magenta foreground
+#define FG_MAGENTA "35"
+
+/// 36  set cyan foreground
+#define FG_CYAN "36"
+
+/// 37  set white foreground
+#define FG_WHITE "37"
+
+/// 38  set underscore on, set default foreground color
+#define FG_UNDERSCORE_ON "38"
+
+/// 39  set underscore off, set default foreground color
+#define FG_UNDERSCORE_OFF "39"
+
+
+
+/// Backgronds:
+
+/// 40  set black background
+#define BG_BLACK "40"
+
+/// 41  set red background
+#define BG_RED "41"
+
+/// 42  set green background
+#define BG_GREEN "42"
+
+/// 43  set brown background
+#define BG_BROWN "43"
+
+/// 44  set blue background
+#define BG_BLUE "44"
+
+/// 45  set magenta background
+#define BG_MAGENTA "45"
+
+/// 46  set cyan background
+#define BG_CYNA "46"
+
+/// 47  set white background
+#define BG_WHITE "47"
+
+/// 49  set default background color
+#define BG_DEFAULT "49"
+
+
+#ifndef NOCOLOR
+  #define COLOR(x)             COLOR_FG(x)
+  #define COLOR_FG(x)          "\33[0;" x "m"
+  #define COLOR_BG(x)          "\33[0;" FG_UNDERSCORE_OFF ";" x "m"
+  #define COLOR_FG_BG(x,y)     "\33[0;" x ";" y "m"
+  #define COLOR_F(x)           "\33[" x ";" FG_UNDERSCORE_OFF "m"
+  #define COLOR_F_FG(x,y)      "\33[" x ";" y ";" BG_DEFAULT "m"
+  #define COLOR_F_FG_BG(x,y,z) "\33[" x ";" y ";" z "m"
+  #define COLOR_RESET          "\33[0m"
+#else
+  #define COLOR(x)             ""
+  #define COLOR_FG(x)          ""
+  #define COLOR_BG(x)          ""
+  #define COLOR_FG_BG(x,y)     ""
+  #define COLOR_F(x)           ""
+  #define COLOR_F_FG(x,y)      ""
+  #define COLOR_F_FG_BG(x,y,z) ""
+  #define COLOR_RESET          ""
+#endif
+
+// #define REMOVE_PREV_LINE "\b"
+
+
+#endif // COLORS_HPP
diff --git a/include/Common.hpp b/include/Common.hpp
index 4d10e45..199e3f9 100644
--- a/include/Common.hpp
+++ b/include/Common.hpp
@@ -39,22 +39,11 @@ inline const char* extractFilename( const char *path )
 }
 
 
-class BadConversion : public std::runtime_error
-{
-
-public:
-
-  BadConversion(std::string const& s) : std::runtime_error(s) { }
-
-};
-
-
 template<typename T>
 inline std::string stringify(T const& x)
 {
   std::ostringstream o;
-  if (!(o << x))
-    throw BadConversion(std::string("stringify(") + typeid(x).name() + ")");
+  o << x;
   return o.str();
 }
 
diff --git a/include/Logger.hpp b/include/Logger.hpp
index fccc3b9..ac8c627 100644
--- a/include/Logger.hpp
+++ b/include/Logger.hpp
@@ -70,6 +70,13 @@ Logger::getInstance()->log_pointer( \
   this, __FILE__, __LINE__, __PRETTY_FUNCTION__); \
 else (void)0
 
+#define TRACE_STATIC \
+if(MAX_LOFLEVEL >= Logger::FINEST && \
+  Logger::getInstance()->getLoglevel() >= Logger::FINEST ) \
+Logger::getInstance()->log_pointer( \
+  0, __FILE__, __LINE__, __PRETTY_FUNCTION__); \
+else (void)0
+
 
 #define LOG(level, msg) \
 if (MAX_LOFLEVEL >= level && \
diff --git a/src/Logger.cpp b/src/Logger.cpp
index f310aae..b352ccb 100644
--- a/src/Logger.cpp
+++ b/src/Logger.cpp
@@ -1,6 +1,7 @@
 #include "Logger.hpp"
 
 #include <time.h> //time
+#include "Colors.hpp"
 
 
 void Logger::init(std::ostream& log_stream )
@@ -22,11 +23,12 @@ void Logger::log_pointer( const void* msg,
                           const char* function)
 {
   *m_ostream  << getTime() << " "
-              << extractFilename(file) << ":"
-              << line << " "
-              << function << " "
-              << "\"" << msg << "\""
-              << std::endl;
+              << COLOR( FG_GREEN ) << extractFilename(file)
+              << COLOR_RESET << ":"
+              << COLOR( FG_BROWN ) <<  line << COLOR_RESET << " "
+              << COLOR( FG_CYAN ) << function << COLOR_RESET << " "
+              << COLOR( FG_BLUE ) << "\"" << msg << "\""
+              << COLOR_RESET << std::endl;
 }
 
 
@@ -36,16 +38,17 @@ void Logger::log_string( const char* msg,
                          const char* function)
 {
   *m_ostream  << getTime() << " "
-              << extractFilename(file) << ":"
-              << line << " "
-              << function << " "
-              << "\"" << msg << "\""
-              << std::endl;
+              << COLOR( FG_GREEN ) << extractFilename(file)
+              << COLOR_RESET << ":"
+              << COLOR( FG_BROWN ) <<  line << COLOR_RESET << " "
+              << COLOR( FG_CYAN ) << function << COLOR_RESET << " "
+              << COLOR_F_FG( F_BOLD, FG_BROWN ) << "\"" << msg << "\""
+              << COLOR_RESET << std::endl;
 }
 
 void Logger::msg(const char* text)
 {
-  *m_ostream  << text << std::endl;
+  *m_ostream  << COLOR_F( F_BOLD) << text << COLOR_RESET << std::endl;
 }
 
 
diff --git a/src/Thread.cpp b/src/Thread.cpp
index 78c916f..8ec624b 100644
--- a/src/Thread.cpp
+++ b/src/Thread.cpp
@@ -33,13 +33,10 @@ void Thread::start()
     sched_param param;
 
     pthread_attr_init(&attr);
-    if ( pthread_attr_setschedpolicy( &attr, SCHED_RR ) != 0 ) {
-      throw std::runtime_error( "Coudn't set thread scheduler." );
-    }
+    pthread_attr_setschedpolicy( &attr, SCHED_RR );
+
     param.sched_priority = 50;
-    if ( pthread_attr_setschedparam( &attr, &param ) != 0 ) {
-      throw std::runtime_error( "Coudn't set thread priority.");
-    }
+    pthread_attr_setschedparam( &attr, &param );
 
     pthread_create( &m_threadHandler, &attr, threadStarter, ( void* )this );
   } else {
@@ -73,6 +70,6 @@ void Thread::sendSignal( const int nSignal ) const
 
 void* Thread::threadStarter( void* pData )
 {
-  LOG(Logger::FINEST, "static");
+  TRACE_STATIC;
   return static_cast<Thread *>(pData)->run();
 }
diff --git a/src/TimerThread.cpp b/src/TimerThread.cpp
index b67822a..7e534d7 100644
--- a/src/TimerThread.cpp
+++ b/src/TimerThread.cpp
@@ -67,7 +67,7 @@ bool TimerThread::removeTimerUser ( void* timerUser )
     if ( (void*)(it->second.user) == (void*)timerUser ) {
       m_users.erase(tmp);
       m_condVar.signal();
-      found = true;  // one usercan be registered multiple times
+      found = true;  // one user can be registered multiple times
     }
   }
   return found;
diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
index ee1a885..e9a96d1 100644
--- a/test/CMakeLists.txt
+++ b/test/CMakeLists.txt
@@ -10,8 +10,7 @@ if(CXXTEST_FOUND)
   enable_testing()
   CXXTEST_ADD_TEST(test
   generated_main.cpp
-
-  test_Common.hpp
+  Fixture.hpp
 
   test_Singelton.hpp
   test_Mutex.hpp
@@ -21,6 +20,7 @@ if(CXXTEST_FOUND)
   test_ThreadPool.hpp
   test_Semaphore.hpp
   test_TimerThread.hpp
+  test_Common.hpp
   )
   target_link_libraries(test CppUtils gcov)
 endif()
diff --git a/test/Fixture.hpp b/test/Fixture.hpp
new file mode 100644
index 0000000..eae3b86
--- /dev/null
+++ b/test/Fixture.hpp
@@ -0,0 +1,35 @@
+#ifndef FIXTURE_HPP
+#define FIXTURE_HPP
+
+#include <cxxtest/TestSuite.h>
+#include <cxxtest/GlobalFixture.h>
+
+#include "Common.hpp"
+#include <iostream>
+
+class TestFixture : public CxxTest::GlobalFixture
+{
+  bool setUpWorld()
+  {
+    Logger::createInstance();
+    Logger::init(std::cout);
+    Logger::setLogLevel(Logger::FINEST);
+    return true;
+  }
+
+  bool tearDownWorld()
+  {
+    Logger::destroy();
+    return true;
+  }
+
+};
+
+static TestFixture testCommon;
+
+/// @todo remove the dot at prev line from cxxtest
+#define TEST_HEADER \
+  MSG( std::string("\n+++ ").append(__PRETTY_FUNCTION__).append(" +++\n").c_str());
+
+
+#endif // FIXTURE_HPP
\ No newline at end of file
diff --git a/test/test_Common.hpp b/test/test_Common.hpp
index 930a5be..e7cd038 100644
--- a/test/test_Common.hpp
+++ b/test/test_Common.hpp
@@ -1,33 +1,23 @@
-#ifndef TEST_COMMON_HPP
-#define TEST_COMMON_HPP
-
 #include <cxxtest/TestSuite.h>
-#include <cxxtest/GlobalFixture.h>
 
+#include "Fixture.hpp"
 #include "Common.hpp"
-#include <iostream>
 
-class TestCommon : public CxxTest::GlobalFixture
-{
-  bool setUpWorld()
-  {
-    Logger::createInstance();
-    Logger::init(std::cout);
-    return true;
-  }
+#include <time.h> // timespec
 
-  bool tearDownWorld()
-  {
-    Logger::destroy();
-    return true;
-  }
+class TestCommon : public CxxTest::TestSuite
+{
 
-};
 
-static TestCommon testCommon;
+public:
 
-#define TEST_HEADER \
-  MSG( std::string("\n+++ ").append(__PRETTY_FUNCTION__).append(" +++\n").c_str());
+  void testCoverageIncrease( void )
+  {
 
+    // coverage increase of addTotimespec
+    long int sec = 0;
+    long int nsec = 1000000000 + 1;
+    timespec ts = addTotimespec(sec, nsec);
+  }
 
-#endif // TEST_COMMON_HPP
\ No newline at end of file
+};
diff --git a/test/test_Mutex.hpp b/test/test_Mutex.hpp
index 68386de..8269c2a 100644
--- a/test/test_Mutex.hpp
+++ b/test/test_Mutex.hpp
@@ -1,7 +1,7 @@
 #include <cxxtest/TestSuite.h>
 
 #include "Common.hpp"
-#include "test_Common.hpp"
+#include "Fixture.hpp"
 #include "Mutex.hpp"
 
 #include <errno.h> // EDEADLK, EPERM, ETIMEDOUT
diff --git a/test/test_PThreadWrappers.hpp b/test/test_PThreadWrappers.hpp
index 454a1e0..471e30b 100644
--- a/test/test_PThreadWrappers.hpp
+++ b/test/test_PThreadWrappers.hpp
@@ -3,7 +3,7 @@
 #define private public // need to reach private variables
 
 #include "Common.hpp"
-#include "test_Common.hpp"
+#include "Fixture.hpp"
 #include "Mutex.hpp"
 
 class TestPThreadWrappers : public CxxTest::TestSuite
diff --git a/test/test_ScopedLock.hpp b/test/test_ScopedLock.hpp
index 04099b1..c74e8d7 100644
--- a/test/test_ScopedLock.hpp
+++ b/test/test_ScopedLock.hpp
@@ -1,7 +1,7 @@
 #include <cxxtest/TestSuite.h>
 
 #include "ScopedLock.hpp"
-#include "test_Common.hpp"
+#include "Fixture.hpp"
 
 
 class TestScopedLock : public CxxTest::TestSuite
diff --git a/test/test_Semaphore.hpp b/test/test_Semaphore.hpp
index 1b8f675..36c8933 100644
--- a/test/test_Semaphore.hpp
+++ b/test/test_Semaphore.hpp
@@ -3,7 +3,7 @@
 #include "Semaphore.hpp"
 #include "Thread.hpp"
 #include "Common.hpp"
-#include "test_Common.hpp"
+#include "Fixture.hpp"
 
 class TestSemaphore : public CxxTest::TestSuite
 {
diff --git a/test/test_Singelton.hpp b/test/test_Singelton.hpp
index 9daa15d..5c339e3 100644
--- a/test/test_Singelton.hpp
+++ b/test/test_Singelton.hpp
@@ -3,7 +3,7 @@
 #define private public // need to reach Singleton's private m_instance
 
 #include "Common.hpp"
-#include "test_Common.hpp"
+#include "Fixture.hpp"
 #include "Singleton.hpp"
 
 
diff --git a/test/test_Thread.hpp b/test/test_Thread.hpp
index 827d7dd..503fa90 100644
--- a/test/test_Thread.hpp
+++ b/test/test_Thread.hpp
@@ -1,6 +1,6 @@
 #include <cxxtest/TestSuite.h>
 
-#include "test_Common.hpp"
+#include "Fixture.hpp"
 
 #include "Thread.hpp"
 #include "Common.hpp"
diff --git a/test/test_ThreadPool.hpp b/test/test_ThreadPool.hpp
index 60b3307..2757876 100644
--- a/test/test_ThreadPool.hpp
+++ b/test/test_ThreadPool.hpp
@@ -6,7 +6,7 @@
 #include "Thread.hpp"
 #include "ThreadPool.hpp"
 #include "Common.hpp"
-#include "test_Common.hpp"
+#include "Fixture.hpp"
 
 
 
diff --git a/test/test_TimerThread.hpp b/test/test_TimerThread.hpp
index 73c44d8..c64b13d 100644
--- a/test/test_TimerThread.hpp
+++ b/test/test_TimerThread.hpp
@@ -1,9 +1,15 @@
 #include <cxxtest/TestSuite.h>
 
-#include "test_Common.hpp"
+#include "Fixture.hpp"
+
+#define private public // reach TimerThread's private multimap
 
 #include "TimerThread.hpp"
 
+#include <time.h>
+
+
+
 
 class TestTimerThread : public CxxTest::TestSuite
 {
@@ -48,6 +54,27 @@ public:
     delete user;
   }
 
+  void testBasicTimeSpec( void )
+  {
+    TEST_HEADER;
+    TimerThread* tt = new TimerThread();
+    tt->start();
+    sleep(1);
+
+    DummyTimerUser *user = new DummyTimerUser();
+    timespec ts = { 1, 123 };
+    tt->addTimerUser( user, ts );
+
+    sleep(4);
+    tt->stop();
+    sleep(1);
+
+    TS_ASSERT_EQUALS( user->m_counter, 1 );
+
+    delete tt;
+    delete user;
+  }
+
   void testPeriodic( void )
   {
     TEST_HEADER;
@@ -68,6 +95,34 @@ public:
     delete user;
   }
 
+    void testPeriodicTimeSpec( void )
+  {
+    TEST_HEADER;
+    TimerThread* tt = new TimerThread();
+    tt->start();
+    sleep(1);
+
+    DummyTimerUser *user = new DummyTimerUser();
+    timespec ts = { 2, 3 };
+    timespec tsperiod = { 1, 2 };
+    tt->addTimerUser( user, ts, tsperiod );
+
+    /// @bug What is wrong here?
+//     DummyTimerUser *user2 = new DummyTimerUser();
+//     timespec ts2 = { 0, 100000000 };
+//     tt->addTimerUser( user2, ts, ts2 );
+
+    sleep(6);
+    tt->stop();
+    sleep(1);
+
+    TS_ASSERT_EQUALS( user->m_counter, 104 );
+//     TS_ASSERT_EQUALS( user2->m_counter, 110 );
+
+    delete tt;
+    delete user;
+  }
+
   void testDestroyed( void )
   {
     TEST_HEADER;
@@ -111,4 +166,40 @@ public:
     delete user;
   }
 
+  /// @bug this case does not work, investigate!
+  void bugtestRemovedMultiple( void )
+  {
+    TEST_HEADER;
+    TimerThread* tt = new TimerThread();
+    tt->start();
+    sleep(1);
+
+    DummyTimerUser *user = new DummyTimerUser();
+    tt->addTimerUser( user, 10 );
+    DummyTimerUser *user2 = new DummyTimerUser();
+    tt->addTimerUser( user2, 12 );
+    DummyTimerUser *user3 = new DummyTimerUser();
+    tt->addTimerUser( user3, 13 );
+    DummyTimerUser *user4 = new DummyTimerUser();
+    tt->addTimerUser( user4, 14 );
+
+    TS_ASSERT_EQUALS( tt->m_users.size(), 4);
+
+    sleep(2);
+    tt->removeTimerUser( user );
+
+    TS_ASSERT_EQUALS( tt->m_users.size(), 0);
+
+    sleep(1);
+    tt->stop();
+    sleep(1);
+
+
+    delete tt;
+    delete user;
+    delete user2;
+    delete user3;
+    delete user4;
+  }
+
 };