Use for instead of if syntax to avoid compiler warnings

CMakeLists.txt

@@ -75,10 +75,14 @@ else()
   list(APPEND FAIRLOGGER_INSTALL_INCLUDE_DIRS ${CMAKE_INSTALL_PREFIX}/${PROJECT_INSTALL_INCDIR}/bundled)
 endif()
 
+if(DEFINED FAIR_MIN_SEVERITY)
+  target_compile_definitions(FairLogger PUBLIC "FAIR_MIN_SEVERITY=${FAIR_MIN_SEVERITY}")
+endif()
+
 target_include_directories(FairLogger
-    PUBLIC
+  PUBLIC
-    $<BUILD_INTERFACE:${CMAKE_SOURCE_DIR}/logger>
+  $<BUILD_INTERFACE:${CMAKE_SOURCE_DIR}/logger>
-    $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>
+  $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>
 )
 set_target_properties(FairLogger PROPERTIES
   VERSION ${PROJECT_GIT_VERSION}
@@ -86,8 +90,22 @@ set_target_properties(FairLogger PROPERTIES
 )
 
 if(BUILD_TESTING)
-  add_executable(loggerTest test/loggerTest.cxx)
+  add_executable(cycleTest test/cycle.cxx)
-  target_link_libraries(loggerTest FairLogger pthread)
+  target_link_libraries(cycleTest FairLogger)
+  add_executable(loggerTest test/logger.cxx)
+  target_link_libraries(loggerTest FairLogger)
+  add_executable(macrosTest test/macros.cxx)
+  target_link_libraries(macrosTest FairLogger)
+  add_executable(nologTest test/nolog.cxx)
+  target_link_libraries(nologTest FairLogger)
+  add_executable(severityTest test/severity.cxx)
+  target_link_libraries(severityTest FairLogger)
+  add_executable(sinksTest test/sinks.cxx)
+  target_link_libraries(sinksTest FairLogger)
+  add_executable(threadsTest test/threads.cxx)
+  target_link_libraries(threadsTest FairLogger pthread)
+  add_executable(verbosityTest test/verbosity.cxx)
+  target_link_libraries(verbosityTest FairLogger)
 endif()
 ################################################################################
 
@@ -127,7 +145,14 @@ install_cmake_package()
 
 # Testing ######################################################################
 if(BUILD_TESTING)
-  add_test(NAME loggerTest COMMAND $<TARGET_FILE:loggerTest>)
+  add_test(NAME cycle COMMAND $<TARGET_FILE:cycleTest>)
+  add_test(NAME logger COMMAND $<TARGET_FILE:loggerTest>)
+  add_test(NAME macros COMMAND $<TARGET_FILE:macrosTest>)
+  add_test(NAME nolog COMMAND $<TARGET_FILE:nologTest>)
+  add_test(NAME severity COMMAND $<TARGET_FILE:severityTest>)
+  add_test(NAME sinks COMMAND $<TARGET_FILE:sinksTest>)
+  add_test(NAME threads COMMAND $<TARGET_FILE:threadsTest>)
+  add_test(NAME verbosity COMMAND $<TARGET_FILE:verbosityTest>)
 endif()
 ################################################################################
 
@@ -212,6 +237,12 @@ else()
 endif()
 message(STATUS "  ${BWhite}tests${CR}       ${testing_summary}")
 message(STATUS "  ")
+if(DEFINED FAIR_MIN_SEVERITY)
+  message(STATUS "  ${Cyan}FAIR_MIN_SEVERITY${CR}  ${BGreen}${FAIR_MIN_SEVERITY}${CR} (change with ${BMagenta}-DFAIR_MIN_SEVERITY=...${CR})")
+else()
+  message(STATUS "  ${Cyan}FAIR_MIN_SEVERITY${CR}  not defined${CR}, enabling all severities (change with ${BMagenta}-DFAIR_MIN_SEVERITY=...${CR})")
+endif()
+message(STATUS "  ")
 message(STATUS "  ${Cyan}INSTALL PREFIX${CR}     ${BGreen}${CMAKE_INSTALL_PREFIX}${CR} (change with ${BMagenta}-DCMAKE_INSTALL_PREFIX=...${CR})")
 message(STATUS "  ")
 ################################################################################

README.md

@@ -106,12 +106,12 @@ Logger will log the chosen severity and all above it (except "nolog", which deac
 
 The minimum severity level can be configured at compile time via definition of `FAIR_MIN_SEVERITY`:
 
-```C++
-#define FAIR_MIN_SEVERITY warn // only allow severities >= warn
-#include <fairlogger/Logger.h>
 ```
+cmake -DFAIR_MIN_SEVERITY=warn ..
+```
+The above would only log severities equal to or above `warn`.
 
-When `FAIR_MIN_SEVERITY` is not provided, it will be set to `info` if `NDEBUG` is defined, otherwise all severities will be enabled.
+When `FAIR_MIN_SEVERITY` is not provided all severities are enabled.
 
 ## 4. Verbosity
 
@@ -126,8 +126,8 @@ it is same for all sinks, and is one of the following values: `verylow`, `low`,
 verylow:  message
 low:      [severity] message
 medium:   [HH:MM:SS][severity] message
-high:     [process name][HH:MM:SS][severity] message
+high:     [process_name][HH:MM:SS][severity] message
-veryhigh: [process name][HH:MM:SS:µS][severity][file:line:function] message
+veryhigh: [process_name][HH:MM:SS:µS][severity][file:line:function] message
 user1:    [severity] message
 user2:    [severity] message
 user3:    [severity] message
@@ -146,12 +146,12 @@ The `fair::Logger::VerbositySpec` object can e.g. be created like this:
 ```C++
 auto spec = fair::VerbositySpec::Make(VerbositySpec::Info::timestamp_s,
                                       VerbositySpec::Info::process_name);
-// results in [HH:MM:SS][process name] message
+// results in [HH:MM:SS][process_name] message
 ```
 
 | **Argument** | **Result** |
 | --- | --- |
-| `fair::VerbositySpec::Info::process_name`       | `[process name]`       |
+| `fair::VerbositySpec::Info::process_name`       | `[process_name]`       |
 | `fair::VerbositySpec::Info::timestamp_s`        | `[HH:MM:SS]`           |
 | `fair::VerbositySpec::Info::timestamp_us`       | `[HH:MM:SS:µS]`        |
 | `fair::VerbositySpec::Info::severity`           | `[severity]`           |

logger/Logger.cxx

@@ -23,31 +23,12 @@ namespace fair
 
 using VSpec = VerbositySpec;
 
-string GetColoredSeverityString(Severity severity)
-{
-    switch (severity) {
-        case Severity::nolog:  return "\033[01;39mNOLOG\033[0m";  break;
-        case Severity::fatal:  return "\033[01;31mFATAL\033[0m";  break;
-        case Severity::error:  return "\033[01;31mERROR\033[0m";  break;
-        case Severity::warn:   return "\033[01;33mWARN\033[0m";   break;
-        case Severity::state:  return "\033[01;35mSTATE\033[0m";  break;
-        case Severity::info:   return "\033[01;32mINFO\033[0m";   break;
-        case Severity::debug:  return "\033[01;34mDEBUG\033[0m";  break;
-        case Severity::debug1: return "\033[01;34mDEBUG1\033[0m"; break;
-        case Severity::debug2: return "\033[01;34mDEBUG2\033[0m"; break;
-        case Severity::debug3: return "\033[01;34mDEBUG3\033[0m"; break;
-        case Severity::debug4: return "\033[01;34mDEBUG4\033[0m"; break;
-        case Severity::trace:  return "\033[01;36mTRACE\033[0m";  break;
-        default:               return "UNKNOWN";                  break;
-    }
-}
-
 bool Logger::fColored = false;
 fstream Logger::fFileStream;
 Verbosity Logger::fVerbosity = Verbosity::low;
-Severity Logger::fConsoleSeverity = Severity::info;
+Severity Logger::fConsoleSeverity = Severity::FAIR_MIN_SEVERITY > Severity::info ? Severity::FAIR_MIN_SEVERITY : Severity::info;
+Severity Logger::fMinSeverity = Severity::FAIR_MIN_SEVERITY > Severity::info ? Severity::FAIR_MIN_SEVERITY : Severity::info;
 Severity Logger::fFileSeverity = Severity::nolog;
-Severity Logger::fMinSeverity = Severity::info;
 function<void()> Logger::fFatalCallback;
 unordered_map<string, pair<Severity, function<void(const string& content, const LogMetaData& metadata)>>> Logger::fCustomSinks;
 mutex Logger::fMtx;
@@ -64,48 +45,48 @@ const string Logger::fProcessName = "?";
 
 const unordered_map<string, Verbosity> Logger::fVerbosityMap =
 {
-    { "veryhigh", Verbosity::veryhigh  },
+    { "veryhigh", Verbosity::veryhigh },
-    { "high",     Verbosity::high      },
+    { "high",     Verbosity::high     },
-    { "medium",   Verbosity::medium    },
+    { "medium",   Verbosity::medium   },
-    { "low",      Verbosity::low       },
+    { "low",      Verbosity::low      },
-    { "verylow",  Verbosity::verylow   },
+    { "verylow",  Verbosity::verylow  },
-    { "VERYHIGH", Verbosity::veryhigh  },
+    { "VERYHIGH", Verbosity::veryhigh },
-    { "HIGH",     Verbosity::high      },
+    { "HIGH",     Verbosity::high     },
-    { "MEDIUM",   Verbosity::medium    },
+    { "MEDIUM",   Verbosity::medium   },
-    { "LOW",      Verbosity::low       },
+    { "LOW",      Verbosity::low      },
-    { "VERYLOW",  Verbosity::verylow   },
+    { "VERYLOW",  Verbosity::verylow  },
-    { "user1",    Verbosity::user1     },
+    { "user1",    Verbosity::user1    },
-    { "user2",    Verbosity::user2     },
+    { "user2",    Verbosity::user2    },
-    { "user3",    Verbosity::user3     },
+    { "user3",    Verbosity::user3    },
-    { "user4",    Verbosity::user4     }
+    { "user4",    Verbosity::user4    }
 };
 
 const unordered_map<string, Severity> Logger::fSeverityMap =
 {
-    { "nolog",   Severity::nolog   },
+    { "nolog",   Severity::nolog  },
-    { "NOLOG",   Severity::nolog   },
+    { "NOLOG",   Severity::nolog  },
-    { "error",   Severity::error   },
+    { "error",   Severity::error  },
-    { "ERROR",   Severity::error   },
+    { "ERROR",   Severity::error  },
-    { "warn",    Severity::warn    },
+    { "warn",    Severity::warn   },
-    { "WARN",    Severity::warn    },
+    { "WARN",    Severity::warn   },
-    { "warning", Severity::warn    },
+    { "warning", Severity::warn   },
-    { "WARNING", Severity::warn    },
+    { "WARNING", Severity::warn   },
-    { "state",   Severity::state   },
+    { "state",   Severity::state  },
-    { "STATE",   Severity::state   },
+    { "STATE",   Severity::state  },
-    { "info",    Severity::info    },
+    { "info",    Severity::info   },
-    { "INFO",    Severity::info    },
+    { "INFO",    Severity::info   },
-    { "debug",   Severity::debug   },
+    { "debug",   Severity::debug  },
-    { "DEBUG",   Severity::debug   },
+    { "DEBUG",   Severity::debug  },
-    { "debug1",  Severity::debug1  },
+    { "debug1",  Severity::debug1 },
-    { "DEBUG1",  Severity::debug1  },
+    { "DEBUG1",  Severity::debug1 },
-    { "debug2",  Severity::debug2  },
+    { "debug2",  Severity::debug2 },
-    { "DEBUG2",  Severity::debug2  },
+    { "DEBUG2",  Severity::debug2 },
-    { "debug3",  Severity::debug3  },
+    { "debug3",  Severity::debug3 },
-    { "DEBUG3",  Severity::debug3  },
+    { "DEBUG3",  Severity::debug3 },
-    { "debug4",  Severity::debug4  },
+    { "debug4",  Severity::debug4 },
-    { "DEBUG4",  Severity::debug4  },
+    { "DEBUG4",  Severity::debug4 },
-    { "trace",   Severity::trace   },
+    { "trace",   Severity::trace  },
-    { "TRACE",   Severity::trace   }
+    { "TRACE",   Severity::trace  }
 };
 
 const array<string, 12> Logger::fSeverityNames =
@@ -294,8 +275,31 @@ void Logger::LogEmptyLine()
     // this call just to prevent any output to be added to the logger object
 }
 
+string Logger::GetColoredSeverityString(Severity severity)
+{
+    switch (severity) {
+        case Severity::nolog:  return "\033[01;39mNOLOG\033[0m";  break;
+        case Severity::fatal:  return "\033[01;31mFATAL\033[0m";  break;
+        case Severity::error:  return "\033[01;31mERROR\033[0m";  break;
+        case Severity::warn:   return "\033[01;33mWARN\033[0m";   break;
+        case Severity::state:  return "\033[01;35mSTATE\033[0m";  break;
+        case Severity::info:   return "\033[01;32mINFO\033[0m";   break;
+        case Severity::debug:  return "\033[01;34mDEBUG\033[0m";  break;
+        case Severity::debug1: return "\033[01;34mDEBUG1\033[0m"; break;
+        case Severity::debug2: return "\033[01;34mDEBUG2\033[0m"; break;
+        case Severity::debug3: return "\033[01;34mDEBUG3\033[0m"; break;
+        case Severity::debug4: return "\033[01;34mDEBUG4\033[0m"; break;
+        case Severity::trace:  return "\033[01;36mTRACE\033[0m";  break;
+        default:               return "UNKNOWN";                  break;
+    }
+}
+
 void Logger::SetConsoleSeverity(const Severity severity)
 {
+    if (severity < Severity::FAIR_MIN_SEVERITY && severity != Severity::nolog) {
+        cout << "Requested severity is higher than the enabled compile-time FAIR_MIN_SEVERITY (" << Severity::FAIR_MIN_SEVERITY << "), ignoring" << endl;
+        return;
+    }
     fConsoleSeverity = severity;
     UpdateMinSeverity();
 }
@@ -317,6 +321,10 @@ Severity Logger::GetConsoleSeverity()
 
 void Logger::SetFileSeverity(const Severity severity)
 {
+    if (severity < Severity::FAIR_MIN_SEVERITY && severity != Severity::nolog) {
+        cout << "Requested severity is higher than the enabled compile-time FAIR_MIN_SEVERITY (" << Severity::FAIR_MIN_SEVERITY << "), ignoring" << endl;
+        return;
+    }
     fFileSeverity = severity;
     UpdateMinSeverity();
 }
@@ -333,8 +341,17 @@ void Logger::SetFileSeverity(const string& severityStr)
 
 void Logger::SetCustomSeverity(const string& key, const Severity severity)
 {
-    fCustomSinks.at(key).first = severity; // TODO: range checks
+    try {
-    UpdateMinSeverity();
+        if (severity < Severity::FAIR_MIN_SEVERITY && severity != Severity::nolog) {
+            cout << "Requested severity is higher than the enabled compile-time FAIR_MIN_SEVERITY (" << Severity::FAIR_MIN_SEVERITY << "), ignoring" << endl;
+            return;
+        }
+        fCustomSinks.at(key).first = severity;
+        UpdateMinSeverity();
+    } catch (const out_of_range& oor) {
+        LOG(error) << "No custom sink with id '" << key << "' found";
+        throw;
+    }
 }
 
 void Logger::SetCustomSeverity(const string& key, const string& severityStr)
@@ -347,11 +364,21 @@ void Logger::SetCustomSeverity(const string& key, const string& severityStr)
     }
 }
 
+Severity Logger::GetCustomSeverity(const std::string& key)
+{
+    try {
+        return fCustomSinks.at(key).first;
+    } catch (const out_of_range& oor) {
+        LOG(error) << "No custom sink with id '" << key << "' found";
+        throw;
+    }
+}
+
 void Logger::CycleConsoleSeverityUp()
 {
     int current = static_cast<int>(fConsoleSeverity);
     if (current == static_cast<int>(fSeverityNames.size()) - 1) {
-        SetConsoleSeverity(static_cast<Severity>(0));
+        SetConsoleSeverity(Severity::FAIR_MIN_SEVERITY);
     } else {
         SetConsoleSeverity(static_cast<Severity>(current + 1));
     }
@@ -359,7 +386,7 @@ void Logger::CycleConsoleSeverityUp()
     stringstream ss;
 
     for (int i = 0; i < static_cast<int>(fSeverityNames.size()); ++i) {
-        ss << (i == newCurrent ? ">" : " ") << fSeverityNames.at(i) << (i == newCurrent ? "<" : " ");
+        ss << (i == newCurrent ? "<" : " ") << fSeverityNames.at(i) << (i == newCurrent ? ">" : " ");
     }
 
     ss << "\n\n";
@@ -369,7 +396,7 @@ void Logger::CycleConsoleSeverityUp()
 void Logger::CycleConsoleSeverityDown()
 {
     int current = static_cast<int>(fConsoleSeverity);
-    if (current == 0) {
+    if (current == static_cast<int>(Severity::FAIR_MIN_SEVERITY)) {
         SetConsoleSeverity(static_cast<Severity>(fSeverityNames.size() - 1));
     } else {
         SetConsoleSeverity(static_cast<Severity>(current - 1));
@@ -378,7 +405,7 @@ void Logger::CycleConsoleSeverityDown()
     stringstream ss;
 
     for (int i = 0; i < static_cast<int>(fSeverityNames.size()); ++i) {
-        ss << (i == newCurrent ? ">" : " ") << fSeverityNames.at(i) << (i == newCurrent ? "<" : " ");
+        ss << (i == newCurrent ? "<" : " ") << fSeverityNames.at(i) << (i == newCurrent ? ">" : " ");
     }
 
     ss << "\n\n";
@@ -397,7 +424,7 @@ void Logger::CycleVerbosityUp()
     stringstream ss;
 
     for (int i = 0; i < static_cast<int>(fVerbosityNames.size()); ++i) {
-        ss << (i == newCurrent ? ">" : " ") << fVerbosityNames.at(i) << (i == newCurrent ? "<" : " ");
+        ss << (i == newCurrent ? "<" : " ") << fVerbosityNames.at(i) << (i == newCurrent ? ">" : " ");
     }
 
     ss << "\n\n";
@@ -416,7 +443,7 @@ void Logger::CycleVerbosityDown()
     stringstream ss;
 
     for (int i = 0; i < static_cast<int>(fVerbosityNames.size()); ++i) {
-        ss << (i == newCurrent ? ">" : " ") << fVerbosityNames.at(i) << (i == newCurrent ? "<" : " ");
+        ss << (i == newCurrent ? "<" : " ") << fVerbosityNames.at(i) << (i == newCurrent ? ">" : " ");
     }
 
     ss << "\n\n";
@@ -428,7 +455,7 @@ void Logger::UpdateMinSeverity()
     if (fFileSeverity == Severity::nolog) {
         fMinSeverity = fConsoleSeverity;
     } else {
-        fMinSeverity = std::min(fConsoleSeverity, fFileSeverity);
+        fMinSeverity = std::max(fConsoleSeverity, fFileSeverity);
     }
 
     for (auto& it : fCustomSinks) {
@@ -440,13 +467,6 @@ void Logger::UpdateMinSeverity()
     }
 }
 
-bool Logger::Logging(Severity severity)
-{
-    return (severity >= fMinSeverity &&
-            fMinSeverity > Severity::nolog) ||
-            severity == Severity::fatal;
-}
-
 bool Logger::Logging(const string& severityStr)
 {
     if (fSeverityMap.count(severityStr)) {
@@ -496,7 +516,7 @@ void Logger::SetConsoleColor(const bool colored)
     fColored = colored;
 }
 
-void Logger::InitFileSink(const Severity severity, const string& filename, bool customizeName)
+string Logger::InitFileSink(const Severity severity, const string& filename, bool customizeName)
 {
     lock_guard<mutex> lock(fMtx);
     if (fFileStream.is_open()) {
@@ -521,21 +541,27 @@ void Logger::InitFileSink(const Severity severity, const string& filename, bool
     fFileStream.open(fullName, fstream::out | fstream::app);
 
     if (fFileStream.is_open()) {
-        fFileSeverity = severity;
+        if (severity < Severity::FAIR_MIN_SEVERITY && severity != Severity::nolog) {
+            cout << "Requested file sink severity is higher than the enabled compile-time FAIR_MIN_SEVERITY (" << Severity::FAIR_MIN_SEVERITY << "), setting to " << Severity::FAIR_MIN_SEVERITY << endl;
+            fFileSeverity = Severity::FAIR_MIN_SEVERITY;
+        } else {
+            fFileSeverity = severity;
+        }
         UpdateMinSeverity();
     } else {
         cout << "Error opening file: " << fullName;
     }
 
+    return fullName;
 }
 
-void Logger::InitFileSink(const string& severityStr, const string& filename, bool customizeName)
+string Logger::InitFileSink(const string& severityStr, const string& filename, bool customizeName)
 {
     if (fSeverityMap.count(severityStr)) {
-        InitFileSink(fSeverityMap.at(severityStr), filename, customizeName);
+        return InitFileSink(fSeverityMap.at(severityStr), filename, customizeName);
     } else {
         LOG(error) << "Unknown severity setting: '" << severityStr << "', setting to default 'info'.";
-        InitFileSink(Severity::info, filename);
+        return InitFileSink(Severity::info, filename);
     }
 }
 
@@ -544,6 +570,8 @@ void Logger::RemoveFileSink()
     lock_guard<mutex> lock(fMtx);
     if (fFileStream.is_open()) {
         fFileStream.close();
+        fFileSeverity = Severity::nolog;
+        UpdateMinSeverity();
     }
 }
 
@@ -577,10 +605,16 @@ void Logger::AddCustomSink(const string& key, Severity severity, function<void(c
 {
     lock_guard<mutex> lock(fMtx);
     if (fCustomSinks.count(key) == 0) {
-        fCustomSinks.insert(make_pair(key, make_pair(severity, func)));
+        if (severity < Severity::FAIR_MIN_SEVERITY && severity != Severity::nolog) {
+            cout << "Requested custom sink severity is higher than the enabled compile-time FAIR_MIN_SEVERITY (" << Severity::FAIR_MIN_SEVERITY << "), setting to " << Severity::FAIR_MIN_SEVERITY << endl;
+            fCustomSinks.insert(make_pair(key, make_pair(Severity::FAIR_MIN_SEVERITY, func)));
+        } else {
+            fCustomSinks.insert(make_pair(key, make_pair(severity, func)));
+        }
         UpdateMinSeverity();
     } else {
         cout << "Logger::AddCustomSink: sink '" << key << "' already exists, will not add again. Remove first with Logger::RemoveCustomSink(const string& key)" << endl;
+        throw runtime_error("Adding a sink with a key that already exists. Remove first.");
     }
 }
 
@@ -601,6 +635,7 @@ void Logger::RemoveCustomSink(const string& key)
         UpdateMinSeverity();
     } else {
         cout << "Logger::RemoveCustomSink: sink '" << key << "' doesn't exists, will not remove." << endl;
+        throw runtime_error("Trying to remove a sink with a key that does not exist.");
     }
 }
 

logger/Logger.h

@@ -13,8 +13,8 @@
 #warning "The symbol 'DEBUG' is used in FairRoot Logger. undefining..."
 #endif
 
-#if !defined(FAIR_MIN_SEVERITY) && defined(NDEBUG)
+#ifndef FAIR_MIN_SEVERITY
-#define FAIR_MIN_SEVERITY info
+#define FAIR_MIN_SEVERITY nolog
 #endif
 
 #ifdef FAIRLOGGER_USE_BOOST_PRETTY_FUNCTION
@@ -39,9 +39,10 @@
 #include <mutex>
 #include <ostream>
 #include <sstream>
+#include <stdexcept>
 #include <string>
 #include <time.h> // time_t
-#include <type_traits>
+#include <type_traits> // is_same
 #include <unordered_map>
 #include <utility> // pair
 
@@ -83,26 +84,26 @@ enum class Severity : int
 // verylow:  message
 // low:      [severity] message
 // medium:   [HH:MM:SS][severity] message
-// high:     [process name][HH:MM:SS][severity] message
+// high:     [process_name][HH:MM:SS][severity] message
-// veryhigh: [process name][HH:MM:SS:µS][severity][file:line:function] message
+// veryhigh: [process_name][HH:MM:SS:µS][severity][file:line:function] message
 enum class Verbosity : int
 {
-    verylow,
+    verylow = 0,
     low,
     medium,
     high,
     veryhigh,
-    // backwards-compatibility:
-    VERYLOW = verylow,
-    LOW = low,
-    MEDIUM = medium,
-    HIGH = high,
-    VERYHIGH = veryhigh,
     // extra slots for user-defined verbosities:
     user1,
     user2,
     user3,
     user4,
+    // backwards-compatibility:
+    VERYLOW = verylow,
+    LOW = low,
+    MEDIUM = medium,
+    HIGH = high,
+    VERYHIGH = veryhigh
 };
 
 struct VerbositySpec
@@ -110,7 +111,7 @@ struct VerbositySpec
     enum class Info : int
     {
         __empty__ = 0,         // used to initialize order array
-        process_name,          // [process name]
+        process_name,          // [process_name]
         timestamp_s,           // [HH:MM:SS]
         timestamp_us,          // [HH:MM:SS:µS]
         severity,              // [severity]
@@ -239,6 +240,7 @@ class Logger
     static std::string startColor(Color color) { return fmt::format("\033[01;{}m", static_cast<int>(color)); }
     static std::string endColor() { return "\033[0m"; }
     static std::string ColorOut(Color c, const std::string& s) { return fmt::format("\033[01;{}m{}\033[0m", static_cast<int>(c), s); }
+    static std::string GetColoredSeverityString(Severity severity);
 
     static void SetConsoleSeverity(const Severity severity);
     static void SetConsoleSeverity(const std::string& severityStr);
@@ -246,16 +248,23 @@ class Logger
 
     static void SetFileSeverity(const Severity severity);
     static void SetFileSeverity(const std::string& severityStr);
+    static Severity GetFileSeverity() { return fFileSeverity; }
 
     static void SetCustomSeverity(const std::string& key, const Severity severity);
     static void SetCustomSeverity(const std::string& key, const std::string& severityStr);
+    static Severity GetCustomSeverity(const std::string& key);
 
     static void CycleConsoleSeverityUp();
     static void CycleConsoleSeverityDown();
     static void CycleVerbosityUp();
     static void CycleVerbosityDown();
 
-    static bool Logging(const Severity severity);
+    static bool Logging(const Severity severity)
+    {
+        return (severity >= fMinSeverity &&
+                fMinSeverity > Severity::nolog) ||
+                severity == Severity::fatal;
+    }
     static bool Logging(const std::string& severityStr);
 
     static void SetVerbosity(const Verbosity verbosity);
@@ -266,8 +275,8 @@ class Logger
 
     static void SetConsoleColor(const bool colored = true);
 
-    static void InitFileSink(const Severity severity, const std::string& filename, bool customizeName = true);
+    static std::string InitFileSink(const Severity severity, const std::string& filename, bool customizeName = true);
-    static void InitFileSink(const std::string& severityStr, const std::string& filename, bool customizeName = true);
+    static std::string InitFileSink(const std::string& severityStr, const std::string& filename, bool customizeName = true);
 
     static void RemoveFileSink();
 
@@ -319,11 +328,7 @@ class Logger
 
     static bool constexpr SuppressSeverity(Severity sev)
     {
-#ifdef FAIR_MIN_SEVERITY
         return sev < Severity::FAIR_MIN_SEVERITY;
-#else
-        return false;
-#endif
     }
 
   private:
@@ -358,6 +363,9 @@ class Logger
     static std::map<Verbosity, VerbositySpec> fVerbosities;
 };
 
+inline std::ostream& operator<<(std::ostream& os, const Severity& s) { return os << Logger::SeverityName(s); }
+inline std::ostream& operator<<(std::ostream& os, const Verbosity& v) { return os << Logger::VerbosityName(v); }
+
 } // namespace fair
 
 #define IMP_CONVERTTOSTRING(s) # s
@@ -407,13 +415,13 @@ class Logger
 
 // Log line if the provided severity is below or equals the configured one
 #define FAIR_LOG(severity) \
-    if (fair::Logger::SuppressSeverity(fair::Severity::severity)) ; else \
+    for (bool fairLOggerunLikelyvariable3 = false; !fair::Logger::SuppressSeverity(fair::Severity::severity) && !fairLOggerunLikelyvariable3; fairLOggerunLikelyvariable3 = true) \
         for (bool fairLOggerunLikelyvariable = false; fair::Logger::Logging(fair::Severity::severity) && !fairLOggerunLikelyvariable; fairLOggerunLikelyvariable = true) \
             fair::Logger(fair::Severity::severity, MSG_ORIGIN)
 
 // Log line with the given verbosity if the provided severity is below or equals the configured one
 #define FAIR_LOGV(severity, verbosity) \
-    if (fair::Logger::SuppressSeverity(fair::Severity::severity)) ; else \
+    for (bool fairLOggerunLikelyvariable3 = false; !fair::Logger::SuppressSeverity(fair::Severity::severity) && !fairLOggerunLikelyvariable3; fairLOggerunLikelyvariable3 = true) \
         for (bool fairLOggerunLikelyvariable = false; fair::Logger::Logging(fair::Severity::severity) && !fairLOggerunLikelyvariable; fairLOggerunLikelyvariable = true) \
             fair::Logger(fair::Severity::severity, fair::Verbosity::verbosity, MSG_ORIGIN)
 
@@ -423,18 +431,18 @@ class Logger
 
 // Log an empty line
 #define FAIR_LOGN(severity) \
-    if (fair::Logger::SuppressSeverity(fair::Severity::severity)) ; else \
+    for (bool fairLOggerunLikelyvariable3 = false; !fair::Logger::SuppressSeverity(fair::Severity::severity) && !fairLOggerunLikelyvariable3; fairLOggerunLikelyvariable3 = true) \
         for (bool fairLOggerunLikelyvariable = false; fair::Logger::Logging(fair::Severity::severity) && !fairLOggerunLikelyvariable; fairLOggerunLikelyvariable = true) \
             fair::Logger(fair::Severity::severity, fair::Verbosity::verylow, MSG_ORIGIN).LogEmptyLine()
 
 // Log with custom file, line, function
 #define FAIR_LOGD(severity, file, line, f) \
-    if (fair::Logger::SuppressSeverity(severity)) ; else \
+    for (bool fairLOggerunLikelyvariable3 = false; !fair::Logger::SuppressSeverity(severity) && !fairLOggerunLikelyvariable3; fairLOggerunLikelyvariable3 = true) \
         for (bool fairLOggerunLikelyvariable = false; fair::Logger::Logging(severity) && !fairLOggerunLikelyvariable; fairLOggerunLikelyvariable = true) \
             fair::Logger(severity, file, line, f)
 
 #define FAIR_LOG_IF(severity, condition) \
-    if (fair::Logger::SuppressSeverity(fair::Severity::severity)) ; else \
+    for (bool fairLOggerunLikelyvariable4 = false; !fair::Logger::SuppressSeverity(fair::Severity::severity) && !fairLOggerunLikelyvariable4; fairLOggerunLikelyvariable4 = true) \
         for (bool fairLOggerunLikelyvariable2 = false; condition && !fairLOggerunLikelyvariable2; fairLOggerunLikelyvariable2 = true) \
             LOG(severity)
 

test/Common.h

@@ -0,0 +1,100 @@
+/********************************************************************************
+ * Copyright (C) 2014-2020 GSI Helmholtzzentrum fuer Schwerionenforschung GmbH  *
+ *                                                                              *
+ *              This software is distributed under the terms of the             *
+ *              GNU Lesser General Public Licence (LGPL) version 3,             *
+ *                  copied verbatim in the file "LICENSE"                       *
+ ********************************************************************************/
+
+#ifndef FAIR_LOGGER_TEST_COMMON_H
+#define FAIR_LOGGER_TEST_COMMON_H
+
+#include <fstream>
+#include <functional>
+#include <iostream>
+#include <regex>
+#include <stdexcept>
+#include <sstream>
+#include <string>
+
+#include <stdio.h> // fflush
+#include <unistd.h> // dup, dup2, close
+
+namespace fair
+{
+namespace logger
+{
+namespace test
+{
+
+template<typename ... T>
+auto ToStr(T&&... t) -> std::string
+{
+    std::stringstream ss;
+    (void)std::initializer_list<int>{(ss << t, 0)...};
+    return ss.str();
+}
+
+template<int S>
+class StreamCapturer
+{
+  public:
+    explicit StreamCapturer()
+        : mFd(S)
+        , mOriginalFd(dup(S)) // create a copy of the given file descriptor
+    {
+        char name[] = "/tmp/fairlogger_test_capture.XXXXXX";
+
+        const int capturedFd = mkstemp(name); // create a unique temporary file
+        if (capturedFd == -1) {
+            std::cout << "Could not create tmp file " << name << " for test; does the test have access to the /tmp directory?" << std::endl;
+            throw std::runtime_error("Could not create tmp file for test; does the test have access to the /tmp directory?");
+        }
+        mTmpFile = name;
+
+        fflush(nullptr); // flushes all open output streams
+        dup2(capturedFd, mFd);
+        close(capturedFd);
+    }
+
+    std::string GetCapture()
+    {
+        fflush(nullptr); // flushes all open output streams
+        std::ifstream t(mTmpFile);
+        std::stringstream buffer;
+        buffer << t.rdbuf();
+        return buffer.str();
+    }
+
+    ~StreamCapturer()
+    {
+        dup2(mOriginalFd, mFd);
+        close(mOriginalFd);
+        remove(mTmpFile.c_str());
+    }
+
+  private:
+    const int mFd;
+    int mOriginalFd;
+    std::string mTmpFile;
+};
+
+void CheckOutput(std::string const& expected, std::function<void()> f)
+{
+    std::string output;
+    {
+        StreamCapturer<1> c;
+        f();
+        output = c.GetCapture();
+    }
+    const std::regex e(expected);
+    if (!std::regex_match(output, e)) {
+        throw std::runtime_error(std::string("MISMATCH:\n##### expected (regex):\n" + expected + "\n##### found:\n" + output));
+    }
+}
+
+} // namespace test
+} // namespace logger
+} // namespace fair
+
+#endif // FAIR_LOGGER_TEST_COMMON_H

test/cycle.cxx

@@ -0,0 +1,81 @@
+/********************************************************************************
+ * Copyright (C) 2014-2020 GSI Helmholtzzentrum fuer Schwerionenforschung GmbH  *
+ *                                                                              *
+ *              This software is distributed under the terms of the             *
+ *              GNU Lesser General Public Licence (LGPL) version 3,             *
+ *                  copied verbatim in the file LICENSE"                       *
+ ********************************************************************************/
+
+#include "Common.h"
+#include <Logger.h>
+
+#include <iostream>
+
+using namespace std;
+using namespace fair;
+using namespace fair::logger::test;
+
+int main()
+{
+    try {
+        Logger::SetConsoleColor(false);
+        Logger::SetVerbosity(Verbosity::user4);
+
+        cout << "initial verbosity >" << Logger::GetVerbosity() << "<" << endl << endl;
+
+        array<Verbosity, 10> verbositiesUp{{ Verbosity::verylow, Verbosity::low, Verbosity::medium, Verbosity::high, Verbosity::veryhigh, Verbosity::user1, Verbosity::user2, Verbosity::user3, Verbosity::user4, Verbosity::verylow }};
+        for (unsigned int i = 0; i < verbositiesUp.size(); ++i) {
+            Logger::CycleVerbosityUp();
+            if (Logger::GetVerbosity() != verbositiesUp.at(i)) { throw runtime_error(ToStr("Expected verbosity to be ", verbositiesUp.at(i), ", but it is ", Logger::GetVerbosity())); }
+        }
+
+        array<Verbosity, 10> verbositiesDown{{ Verbosity::user4, Verbosity::user3, Verbosity::user2, Verbosity::user1, Verbosity::veryhigh, Verbosity::high, Verbosity::medium, Verbosity::low, Verbosity::verylow, Verbosity::user4 }};
+        for (unsigned int i = 0; i < verbositiesDown.size(); ++i) {
+            Logger::CycleVerbosityDown();
+            if (Logger::GetVerbosity() != verbositiesDown.at(i)) { throw runtime_error(ToStr("Expected verbosity to be ", verbositiesDown.at(i), ", but it is ", Logger::GetVerbosity())); }
+        }
+
+        Logger::SetConsoleSeverity(Severity::fatal);
+        cout << "initial severity >" << Logger::GetConsoleSeverity() << "<" << endl << endl;
+
+        array<Severity, 12> severitiesUp{{ Severity::nolog, Severity::trace, Severity::debug4, Severity::debug3, Severity::debug2, Severity::debug1, Severity::debug, Severity::info, Severity::state, Severity::warn, Severity::error, Severity::fatal }};
+#ifdef FAIR_MIN_SEVERITY
+        for (unsigned int i = static_cast<int>(Severity::FAIR_MIN_SEVERITY); i < severitiesUp.size(); ++i) {
+#else
+        for (unsigned int i = 0; i < severitiesUp.size(); ++i) {
+#endif
+            Logger::CycleConsoleSeverityUp();
+            if (Logger::GetConsoleSeverity() != severitiesUp.at(i)) { throw runtime_error(ToStr("Expected severity to be ", severitiesUp.at(i), ", but it is ", Logger::GetConsoleSeverity())); }
+        }
+        Logger::CycleConsoleSeverityUp();
+#ifdef FAIR_MIN_SEVERITY
+        if (Logger::GetConsoleSeverity() != Severity::FAIR_MIN_SEVERITY) { throw runtime_error(ToStr("Expected severity to be ", Severity::nolog, ", but it is ", Logger::GetConsoleSeverity())); }
+#else
+        if (Logger::GetConsoleSeverity() != Severity::nolog) { throw runtime_error(ToStr("Expected severity to be ", Severity::nolog, ", but it is ", Logger::GetConsoleSeverity())); }
+#endif
+
+        Logger::SetConsoleSeverity(Severity::fatal);
+        cout << "initial severity >" << Logger::GetConsoleSeverity() << "<" << endl << endl;
+
+        array<Severity, 12> severitiesDown{{ Severity::error, Severity::warn, Severity::state, Severity::info, Severity::debug, Severity::debug1, Severity::debug2, Severity::debug3, Severity::debug4, Severity::trace, Severity::nolog, Severity::fatal }};
+#ifdef FAIR_MIN_SEVERITY
+        for (unsigned int i = 0; i < severitiesDown.size() - static_cast<int>(Severity::FAIR_MIN_SEVERITY) - 1; ++i) {
+#else
+        for (unsigned int i = 0; i < severitiesDown.size(); ++i) {
+#endif
+            Logger::CycleConsoleSeverityDown();
+            if (Logger::GetConsoleSeverity() != severitiesDown.at(i)) { throw runtime_error(ToStr("Expected severity to be ", severitiesDown.at(i), ", but it is ", Logger::GetConsoleSeverity())); }
+        }
+        Logger::CycleConsoleSeverityDown();
+#ifdef FAIR_MIN_SEVERITY
+        if (Logger::GetConsoleSeverity() != Severity::fatal) { throw runtime_error(ToStr("Expected severity to be ", Severity::fatal, ", but it is ", Logger::GetConsoleSeverity())); }
+#else
+        if (Logger::GetConsoleSeverity() != Severity::error) { throw runtime_error(ToStr("Expected severity to be ", Severity::error, ", but it is ", Logger::GetConsoleSeverity())); }
+#endif
+    } catch (runtime_error& rte) {
+        cout << rte.what() << endl;
+        return 1;
+    }
+
+    return 0;
+}

test/logger.cxx

@@ -0,0 +1,58 @@
+/********************************************************************************
+ * Copyright (C) 2014-2020 GSI Helmholtzzentrum fuer Schwerionenforschung GmbH  *
+ *                                                                              *
+ *              This software is distributed under the terms of the             *
+ *              GNU Lesser General Public Licence (LGPL) version 3,             *
+ *                  copied verbatim in the file "LICENSE"                       *
+ ********************************************************************************/
+
+#include <Logger.h>
+
+#include <iostream>
+
+using namespace std;
+using namespace fair;
+
+void printEverySeverity()
+{
+    static int i = 1;
+
+    LOG(nolog)  << "nolog message, counter: "   << i++;
+    LOG(trace)  << "trace message, counter: "   << i++;
+    LOG(debug4) << "debug4 message, counter: "  << i++;
+    LOG(debug3) << "debug3 message, counter: "  << i++;
+    LOG(debug2) << "debug2 message, counter: "  << i++;
+    LOG(debug1) << "debug1 message, counter: "  << i++;
+    LOG(debug)  << "debug message, counter: "   << i++;
+    LOG(info)   << "info message, counter: "    << i++;
+    LOG(state)  << "state message, counter: "   << i++;
+    LOG(warn)   << "warning message, counter: " << i++;
+    LOG(error)  << "error message, counter: "   << i++;
+    LOG(fatal)  << "fatal message, counter: "   << i++;
+}
+
+void printAllVerbositiesWithSeverity(Severity sev)
+{
+    Logger::SetConsoleSeverity(sev);
+
+    for (uint32_t i = 0; i < Logger::fVerbosityNames.size(); ++i) {
+        cout << "##### testing severity '" << sev << "' with verbosity '" << Logger::fVerbosityNames.at(i) << "'" << endl;
+        Logger::SetVerbosity(static_cast<Verbosity>(i));
+        printEverySeverity();
+    }
+}
+
+int main()
+{
+    Logger::SetConsoleColor(true);
+    Logger::SetVerbosity(Verbosity::veryhigh);
+    cout << "##### GetConsoleSeverity = " << Logger::SeverityName(Logger::GetConsoleSeverity()) << endl;
+
+    cout << "##### testing severities..." << endl;
+
+    for (uint32_t i = 0; i < Logger::fSeverityNames.size(); ++i) {
+        printAllVerbositiesWithSeverity(static_cast<Severity>(i));
+    }
+
+    return 0;
+}

test/loggerTest.cxx

@@ -1,208 +0,0 @@
-/********************************************************************************
- * Copyright (C) 2014-2019 GSI Helmholtzzentrum fuer Schwerionenforschung GmbH  *
- *                                                                              *
- *              This software is distributed under the terms of the             *
- *              GNU Lesser General Public Licence (LGPL) version 3,             *
- *                  copied verbatim in the file "LICENSE"                       *
- ********************************************************************************/
-#include <Logger.h>
-
-#include <iostream>
-#include <vector>
-#include <thread>
-
-using namespace std;
-using namespace fair;
-
-void printEverySeverity()
-{
-    static int i = 1;
-
-    LOG(nolog) << "nolog message "   << i++;
-    LOG(error) << "error message "   << i++;
-    LOG(warn)  << "warning message " << i++;
-    LOG(state) << "state message "   << i++;
-    LOG(info)  << "info message "    << i++;
-    LOG(debug) << "debug message "   << i++;
-    LOG(debug1) << "debug1 message "   << i++;
-    LOG(debug2) << "debug2 message "   << i++;
-    LOG(debug3) << "debug3 message "   << i++;
-    LOG(debug4) << "debug4 message "   << i++;
-    LOG(trace) << "trace message "   << i++;
-}
-
-void printAllVerbositiesWithSeverity(Severity sev)
-{
-    Logger::SetConsoleSeverity(sev);
-
-    cout << endl << "cout: >>> testing severity '" << Logger::SeverityName(sev) << "' with 'verylow' verbosity..." << endl;
-    Logger::SetVerbosity(Verbosity::verylow);
-    printEverySeverity();
-    cout << endl << "cout: >>> testing severity '" << Logger::SeverityName(sev) << "' with 'low' verbosity..." << endl;
-    Logger::SetVerbosity(Verbosity::low);
-    printEverySeverity();
-    cout << endl << "cout: >>> testing severity '" << Logger::SeverityName(sev) << "' with 'medium' verbosity..." << endl;
-    Logger::SetVerbosity(Verbosity::medium);
-    printEverySeverity();
-    cout << endl << "cout: >>> testing severity '" << Logger::SeverityName(sev) << "' with 'high' verbosity..." << endl;
-    Logger::SetVerbosity(Verbosity::high);
-    printEverySeverity();
-    cout << endl << "cout: >>> testing severity '" << Logger::SeverityName(sev) << "' with 'veryhigh' verbosity..." << endl;
-    Logger::SetVerbosity(Verbosity::veryhigh);
-    printEverySeverity();
-    cout << endl << "cout: >>> testing severity '" << Logger::SeverityName(sev) << "' with 'user1' verbosity..." << endl;
-    Logger::SetVerbosity(Verbosity::user1);
-    printEverySeverity();
-    cout << endl << "cout: >>> testing severity '" << Logger::SeverityName(sev) << "' with 'user2' verbosity..." << endl;
-    Logger::SetVerbosity(Verbosity::user2);
-    printEverySeverity();
-    cout << endl << "cout: >>> testing severity '" << Logger::SeverityName(sev) << "' with 'user3' verbosity..." << endl;
-    Logger::SetVerbosity(Verbosity::user3);
-    printEverySeverity();
-    cout << endl << "cout: >>> testing severity '" << Logger::SeverityName(sev) << "' with 'user4' verbosity..." << endl;
-    Logger::SetVerbosity(Verbosity::user4);
-    printEverySeverity();
-}
-
-void silentlyPrintAllVerbositiesWithSeverity(Severity sev)
-{
-    Logger::SetConsoleSeverity(sev);
-
-    Logger::SetVerbosity(Verbosity::verylow);
-    printEverySeverity();
-    Logger::SetVerbosity(Verbosity::low);
-    printEverySeverity();
-    Logger::SetVerbosity(Verbosity::medium);
-    printEverySeverity();
-    Logger::SetVerbosity(Verbosity::high);
-    printEverySeverity();
-    Logger::SetVerbosity(Verbosity::veryhigh);
-    printEverySeverity();
-    Logger::SetVerbosity(Verbosity::user1);
-    printEverySeverity();
-    Logger::SetVerbosity(Verbosity::user2);
-    printEverySeverity();
-    Logger::SetVerbosity(Verbosity::user3);
-    printEverySeverity();
-    Logger::SetVerbosity(Verbosity::user4);
-    printEverySeverity();
-}
-
-int main()
-{
-    Logger::SetConsoleColor(true);
-
-    auto spec = VerbositySpec::Make(VerbositySpec::Info::file_line_function,
-                                    VerbositySpec::Info::process_name,
-                                    VerbositySpec::Info::process_name);
-    cout << "Defining custom verbosity \"user2\"" << endl;
-    Logger::DefineVerbosity(Verbosity::user2, spec);
-
-    cout << "cout: testing severities..." << endl;
-
-    printAllVerbositiesWithSeverity(Severity::trace);
-    printAllVerbositiesWithSeverity(Severity::debug4);
-    printAllVerbositiesWithSeverity(Severity::debug3);
-    printAllVerbositiesWithSeverity(Severity::debug2);
-    printAllVerbositiesWithSeverity(Severity::debug1);
-    printAllVerbositiesWithSeverity(Severity::debug);
-    printAllVerbositiesWithSeverity(Severity::info);
-    printAllVerbositiesWithSeverity(Severity::state);
-    printAllVerbositiesWithSeverity(Severity::warn);
-    printAllVerbositiesWithSeverity(Severity::error);
-    printAllVerbositiesWithSeverity(Severity::nolog);
-
-    cout << endl;
-    cout << "cout: setting severity to 'info' and verbosity to 'medium'" << endl;
-    Logger::SetConsoleSeverity(Severity::info);
-    Logger::SetVerbosity(Verbosity::medium);
-
-    cout << "cout: is logging trace: " << fair::Logger::Logging(Severity::trace) << endl;
-    cout << "cout: is logging debug4: " << fair::Logger::Logging(Severity::debug) << endl;
-    cout << "cout: is logging debug3: " << fair::Logger::Logging(Severity::debug) << endl;
-    cout << "cout: is logging debug2: " << fair::Logger::Logging(Severity::debug) << endl;
-    cout << "cout: is logging debug1: " << fair::Logger::Logging(Severity::debug) << endl;
-    cout << "cout: is logging debug: " << fair::Logger::Logging(Severity::debug) << endl;
-    cout << "cout: is logging info: " << fair::Logger::Logging(Severity::info) << endl;
-    cout << "cout: is logging state: " << fair::Logger::Logging(Severity::state) << endl;
-    cout << "cout: is logging warn: " << fair::Logger::Logging(Severity::warn) << endl;
-    cout << "cout: is logging error: " << fair::Logger::Logging(Severity::error) << endl;
-    cout << "cout: is logging fatal: " << fair::Logger::Logging(Severity::fatal) << endl;
-    cout << "cout: is logging nolog: " << fair::Logger::Logging(Severity::nolog) << endl;
-
-    for (int i = 0; i < 1000000; ++i) {
-        silentlyPrintAllVerbositiesWithSeverity(Severity::nolog);
-    }
-    cout << endl;
-    cout << "cout: setting severity to 'trace' and verbosity to 'veryhigh'" << endl;
-    Logger::SetConsoleSeverity(Severity::trace);
-    Logger::SetVerbosity(Verbosity::veryhigh);
-
-    cout << endl;
-    cout << "cout: testing conditional logging..." << endl;
-    int x = 0;
-    LOG(info) << "x = " << x << " (initial)";
-    LOG_IF(info, (x == 0)) << "incrementing x to " << ++x;
-    LOG(info) << "x = " << x << " (after increment)";
-    LOG_IF(info, (x == 0)) << "this should not be printed and x not incremented: " << ++x;
-    LOG(info) << "x = " << x << " (after conditional increment)";
-
-    cout << endl;
-    cout << "cout: setting severity to 'nolog'" << endl;
-    Logger::SetConsoleSeverity(Severity::nolog);
-
-    cout << "cout: ----------------------------" << endl;
-    cout << "cout: open log file with severity 'error'" << endl;
-    Logger::InitFileSink(Severity::error, "test_log", true);
-    printEverySeverity();
-    cout << "cout: closing log file" << endl;
-    Logger::RemoveFileSink();
-
-
-    cout << "cout: setting severity to 'nolog'" << endl;
-    Logger::SetConsoleSeverity(Severity::nolog);
-    cout << "cout: ----------------------------" << endl;
-    cout << "cout: adding custom sink with error severity" << endl << endl;
-
-    Logger::AddCustomSink("CustomSink", "error", [](const string& content, const LogMetaData& metadata)
-    {
-        cout << "CustomSink: content: " << content << endl;
-
-        cout << "CustomSink: available metadata: " << endl;
-        cout << "CustomSink: \tstd::time_t timestamp: " << metadata.timestamp << endl;
-        cout << "CustomSink: \tstd::chrono::microseconds us: " << metadata.us.count() << endl;
-        cout << "CustomSink: \tstd::string process_name: " << metadata.process_name << endl;
-        cout << "CustomSink: \tstd::string file: " << metadata.file << endl;
-        cout << "CustomSink: \tstd::string line: " << metadata.line << endl;
-        cout << "CustomSink: \tstd::string func: " << metadata.func << endl;
-        cout << "CustomSink: \tstd::string severity_name: " << metadata.severity_name << endl;
-        cout << "CustomSink: \tfair::Severity severity: " << static_cast<int>(metadata.severity) << endl;
-    });
-
-    printEverySeverity();
-
-    cout << endl << "cout: removing custom sink with info severity" << endl;
-
-    Logger::AddCustomSink("CustomSink", Severity::error, [](const string& /*content*/, const LogMetaData& /*metadata*/){});
-    Logger::RemoveCustomSink("CustomSink");
-    Logger::RemoveCustomSink("bla");
-
-    cout << "cout: setting severity to 'trace'" << endl;
-    Logger::SetConsoleSeverity(Severity::trace);
-
-    LOGP(info, "Hello {} {}!", "world", ":-)");
-    LOGF(info, "Hello %s %s!", "world", ":-)");
-
-    cout << "cout: setting verbosity to 'high'" << endl;
-    Logger::SetVerbosity(Verbosity::high);
-
-    LOGV(info, verylow) << "I should be printed with very low verbosity";
-
-    cout << "cout: pushing 4 new lines with LOGN() in info verbosity" << endl;
-    LOGN(info);
-    LOGN(info);
-    LOGN(info);
-    LOGN(info);
-
-    return 0;
-}

test/macros.cxx

@@ -0,0 +1,60 @@
+/********************************************************************************
+ * Copyright (C) 2014-2020 GSI Helmholtzzentrum fuer Schwerionenforschung GmbH  *
+ *                                                                              *
+ *              This software is distributed under the terms of the             *
+ *              GNU Lesser General Public Licence (LGPL) version 3,             *
+ *                  copied verbatim in the file "LICENSE"                       *
+ ********************************************************************************/
+
+#include "Common.h"
+#include <Logger.h>
+
+#include <iostream>
+
+using namespace std;
+using namespace fair;
+using namespace fair::logger::test;
+
+int main()
+{
+    try {
+        Logger::SetConsoleColor(false);
+        Logger::SetConsoleSeverity(Severity::fatal);
+        Logger::SetVerbosity(Verbosity::verylow);
+
+        int x = 0;
+
+        CheckOutput("^incrementing x to 1\n$", [&]() { LOG_IF(fatal, true) << "incrementing x to " << ++x; });
+        if (x != 1) {
+            throw runtime_error(ToStr("expected x to be 1, but it is: ", x));
+        }
+
+        CheckOutput("^$", [&]() { LOG_IF(fatal, false) << "incrementing x to " << ++x; });
+        if (x != 1) {
+            throw runtime_error(ToStr("expected x to be 1, but it is: ", x));
+        }
+
+        CheckOutput("^Hello world :-\\)!\n$", []() { LOGP(fatal, "Hello {} {}!", "world", ":-)"); });
+        CheckOutput("^Hello world :-\\)!\n$", []() { LOGF(fatal, "Hello %s %s!", "world", ":-)"); });
+
+        CheckOutput(ToStr(R"(^\[FATAL\])", " content\n$"), []() { LOGV(fatal, low) << "content"; });
+
+        CheckOutput("^\n\n\n\n$", []() {
+            LOGN(fatal);
+            LOGN(fatal);
+            LOGN(fatal);
+            LOGN(fatal);
+        });
+
+        Logger::SetVerbosity(Verbosity::veryhigh);
+
+        CheckOutput(ToStr(R"(^\[.*\]\[\d{2}:\d{2}:\d{2}\.\d{6}\]\[FATAL\]\[a:4:b\])", " c\n$"), []() {
+            LOGD(Severity::fatal, "a", "4", "b") << "c";
+        });
+    } catch (runtime_error& rte) {
+        cout << rte.what() << endl;
+        return 1;
+    }
+
+    return 0;
+}

test/nolog.cxx

@@ -0,0 +1,60 @@
+/********************************************************************************
+ * Copyright (C) 2014-2020 GSI Helmholtzzentrum fuer Schwerionenforschung GmbH  *
+ *                                                                              *
+ *              This software is distributed under the terms of the             *
+ *              GNU Lesser General Public Licence (LGPL) version 3,             *
+ *                  copied verbatim in the file "LICENSE"                       *
+ ********************************************************************************/
+
+#include <Logger.h>
+
+using namespace std;
+using namespace fair;
+
+void printEverySeverity()
+{
+    LOG(nolog)  << "nolog message, counter: ";
+    LOG(trace)  << "trace message, counter: ";
+    LOG(debug4) << "debug4 message, counter: ";
+    LOG(debug3) << "debug3 message, counter: ";
+    LOG(debug2) << "debug2 message, counter: ";
+    LOG(debug1) << "debug1 message, counter: ";
+    LOG(debug)  << "debug message, counter: ";
+    LOG(info)   << "info message, counter: " ;
+    LOG(state)  << "state message, counter: ";
+    LOG(warn)   << "warning message, counter: ";
+    LOG(error)  << "error message, counter: ";
+}
+
+void silentlyPrintAllVerbositiesWithSeverity(Severity sev)
+{
+    Logger::SetConsoleSeverity(sev);
+
+    Logger::SetVerbosity(Verbosity::verylow);
+    printEverySeverity();
+    Logger::SetVerbosity(Verbosity::low);
+    printEverySeverity();
+    Logger::SetVerbosity(Verbosity::medium);
+    printEverySeverity();
+    Logger::SetVerbosity(Verbosity::high);
+    printEverySeverity();
+    Logger::SetVerbosity(Verbosity::veryhigh);
+    printEverySeverity();
+    Logger::SetVerbosity(Verbosity::user1);
+    printEverySeverity();
+    Logger::SetVerbosity(Verbosity::user2);
+    printEverySeverity();
+    Logger::SetVerbosity(Verbosity::user3);
+    printEverySeverity();
+    Logger::SetVerbosity(Verbosity::user4);
+    printEverySeverity();
+}
+
+int main()
+{
+    for (int i = 0; i < 1000000; ++i) {
+        silentlyPrintAllVerbositiesWithSeverity(Severity::nolog);
+    }
+
+    return 0;
+}

test/severity.cxx

@@ -0,0 +1,98 @@
+/********************************************************************************
+ * Copyright (C) 2014-2020 GSI Helmholtzzentrum fuer Schwerionenforschung GmbH  *
+ *                                                                              *
+ *              This software is distributed under the terms of the             *
+ *              GNU Lesser General Public Licence (LGPL) version 3,             *
+ *                  copied verbatim in the file "LICENSE"                       *
+ ********************************************************************************/
+
+#include "Common.h"
+#include <Logger.h>
+
+#include <cstdint>
+#include <iostream>
+#include <stdexcept>
+#include <string>
+
+using namespace std;
+using namespace fair;
+using namespace fair::logger::test;
+
+uint32_t printEverySeverity(uint32_t i)
+{
+    LOG(nolog)  << "nolog message, counter: "   << i++;
+    LOG(trace)  << "trace message, counter: "   << i++;
+    LOG(debug4) << "debug4 message, counter: "  << i++;
+    LOG(debug3) << "debug3 message, counter: "  << i++;
+    LOG(debug2) << "debug2 message, counter: "  << i++;
+    LOG(debug1) << "debug1 message, counter: "  << i++;
+    LOG(debug)  << "debug message, counter: "   << i++;
+    LOG(info)   << "info message, counter: "    << i++;
+    LOG(state)  << "state message, counter: "   << i++;
+    LOG(warn)   << "warning message, counter: " << i++;
+    LOG(error)  << "error message, counter: "   << i++;
+    LOG(fatal)  << "fatal message, counter: "   << i++;
+
+    return i;
+}
+
+void CheckSeverity(Severity severity)
+{
+    Logger::SetConsoleSeverity(severity);
+    auto sev = Logger::GetConsoleSeverity();
+
+    cout << "##### testing severity '" << Logger::SeverityName(sev) << "' (" << static_cast<int>(sev) << "), Logging(): " << std::boolalpha << Logger::Logging(sev) << endl;
+
+    for (uint32_t i = 0; i < Logger::fSeverityNames.size(); ++i) {
+        if (sev == Severity::nolog) {
+            if (i == 11) {
+                if (!Logger::Logging(static_cast<Severity>(i))) {
+                    throw runtime_error(ToStr("expecting to be logging ", Logger::fSeverityNames.at(i), " during ", sev, ", but it is not."));
+                }
+            } else {
+                if (Logger::Logging(static_cast<Severity>(i))) {
+                    throw runtime_error(ToStr("expecting to NOT be logging ", Logger::fSeverityNames.at(i), " during ", sev, ", but it is."));
+                }
+            }
+        } else {
+            if (i >= static_cast<unsigned int>(sev)) {
+                if (!Logger::Logging(static_cast<Severity>(i))) {
+                    throw runtime_error(ToStr("expecting to be logging ", Logger::fSeverityNames.at(i), " during ", sev, ", but it is not."));
+                }
+            } else {
+                if (Logger::Logging(static_cast<Severity>(i))) {
+                    throw runtime_error(ToStr("expecting to NOT be logging ", Logger::fSeverityNames.at(i), " during ", sev, ", but it is."));
+                }
+            }
+        }
+    }
+
+    uint32_t i = 0;
+    i = printEverySeverity(i);
+    if (sev == Severity::nolog) {
+        if (i != 1) {
+            throw runtime_error(ToStr("expected: i==1, found: i==", i));
+        }
+    } else {
+        if (i != Logger::fSeverityNames.size() - static_cast<int>(sev)) {
+            throw runtime_error(ToStr("expected: i==", Logger::fSeverityNames.size() - static_cast<int>(sev) - 1, ", found: i==", i));
+        }
+    }
+}
+
+int main()
+{
+    try {
+        Logger::SetConsoleColor(true);
+
+        cout << "##### testing " << Logger::fSeverityNames.size() << " severities..." << endl;
+        for (uint32_t i = 0; i < Logger::fSeverityNames.size(); ++i) {
+            CheckSeverity(static_cast<Severity>(i));
+        }
+    } catch (runtime_error& rte) {
+        cout << rte.what() << endl;
+        return 1;
+    }
+
+    return 0;
+}

test/sinks.cxx

@@ -0,0 +1,151 @@
+/********************************************************************************
+ * Copyright (C) 2014-2020 GSI Helmholtzzentrum fuer Schwerionenforschung GmbH  *
+ *                                                                              *
+ *              This software is distributed under the terms of the             *
+ *              GNU Lesser General Public Licence (LGPL) version 3,             *
+ *                  copied verbatim in the file "LICENSE"                       *
+ ********************************************************************************/
+
+#include "Common.h"
+#include <Logger.h>
+
+#include <fstream>
+#include <iostream>
+#include <random>
+#include <sstream>
+
+using namespace std;
+using namespace fair;
+using namespace fair::logger::test;
+
+int main()
+{
+#ifdef FAIR_MIN_SEVERITY
+    if (static_cast<int>(Severity::FAIR_MIN_SEVERITY) > static_cast<int>(Severity::warn)) {
+        cout << "test requires at least FAIR_MIN_SEVERITY == warn to run, skipping" << endl;
+        return 0;
+    }
+#endif
+
+    try {
+        Logger::SetConsoleColor(false);
+        Logger::SetConsoleSeverity(Severity::nolog);
+        Logger::SetVerbosity(Verbosity::low);
+
+        if (Logger::Logging(Severity::warn)) { cout << "Logger expected to NOT log warn, but it reports to do so" << endl; return 1; }
+        if (Logger::Logging(Severity::error)) { cout << "Logger expected to NOT log error, but it reports to do so" << endl; return 1; }
+        if (!Logger::Logging(Severity::fatal)) { cout << "Logger expected to log fatal, but it reports not to" << endl; return 1; }
+
+        cout << "##### adding file sink with warn severity" << endl;
+        random_device rd;
+        mt19937 gen(rd());
+        uniform_int_distribution<> distrib(1, 65536);
+        string name = Logger::InitFileSink(Severity::warn, string("test_log_" + to_string(distrib(gen))), true);
+
+        if (Logger::GetFileSeverity() != Severity::warn) {
+            throw runtime_error(ToStr("File sink severity (", Logger::GetFileSeverity(), ") does not match the expected one (", Severity::warn, ")"));
+        }
+
+        CheckOutput("^\\[FATAL\\] fatal\n$", [](){
+            LOG(state) << "state";
+            LOG(warn) << "warning";
+            LOG(error) << "error";
+            LOG(fatal) << "fatal";
+        });
+
+        if (Logger::Logging(Severity::state)) { cout << "Logger expected to NOT log warn, but it reports to do so" << endl; return 1; }
+        if (!Logger::Logging(Severity::warn)) { cout << "Logger expected to log warn, but it reports not to" << endl; return 1; }
+        if (!Logger::Logging(Severity::error)) { cout << "Logger expected to log error, but it reports not to" << endl; return 1; }
+        if (!Logger::Logging(Severity::fatal)) { cout << "Logger expected to log fatal, but it reports not to" << endl; return 1; }
+
+        ifstream t(name);
+        stringstream buffer;
+        buffer << t.rdbuf();
+        string fileContent = buffer.str();
+
+        if (fileContent != "[WARN] warning\n[ERROR] error\n[FATAL] fatal\n") {
+            throw runtime_error(ToStr("unexpected file sink output. expected:\n[WARN] warning\n[ERROR] error\n[FATAL] fatal\nfound:\n", fileContent));
+        }
+
+        cout << "##### removing file sink with warn severity" << endl;
+        Logger::RemoveFileSink();
+
+        if (Logger::Logging(Severity::warn)) { cout << "Logger expected to NOT log warn, but it reports to do so" << endl; return 1; }
+        if (Logger::Logging(Severity::error)) { cout << "Logger expected to NOT log error, but it reports to do so" << endl; return 1; }
+        if (!Logger::Logging(Severity::fatal)) { cout << "Logger expected to log fatal, but it reports not to" << endl; return 1; }
+
+        cout << "##### adding custom sink with warn severity" << endl;
+
+        Logger::AddCustomSink("CustomSink", "warn", [](const string& content, const LogMetaData& metadata)
+        {
+            cout << "CustomSink " << content << endl;
+
+            if (metadata.severity != Severity::warn && metadata.severity != Severity::error && metadata.severity != Severity::fatal) {
+                throw runtime_error(ToStr("unexpected severity message arrived at custom sink that accepts only warn,error,fatal: ", metadata.severity));
+            }
+
+            if (metadata.severity_name != "WARN" && metadata.severity_name != "ERROR" && metadata.severity_name != "FATAL") {
+                throw runtime_error(ToStr("unexpected severity name arrived at custom sink that accepts only warn,error,fatal: ", metadata.severity_name));
+            }
+        });
+
+        if (Logger::GetCustomSeverity("CustomSink") != Severity::warn) {
+            throw runtime_error(ToStr("File sink severity (", Logger::GetCustomSeverity("CustomSink"), ") does not match the expected one (", Severity::warn, ")"));
+        }
+
+        bool oorThrown = false;
+        try {
+            Logger::GetCustomSeverity("NonExistentSink");
+        } catch (const out_of_range& oor) {
+            oorThrown = true;
+        }
+        if (!oorThrown) {
+            throw runtime_error("Did not detect a severity request from a non-existent sink");
+        }
+
+        CheckOutput("^CustomSink warning\nCustomSink error\nCustomSink fatal\n\\[FATAL\\] fatal\n$", [](){
+            LOG(state) << "state";
+            LOG(warn) << "warning";
+            LOG(error) << "error";
+            LOG(fatal) << "fatal";
+        });
+
+        if (Logger::Logging(Severity::state)) { cout << "Logger expected to NOT log warn, but it reports to do so" << endl; return 1; }
+        if (!Logger::Logging(Severity::warn)) { cout << "Logger expected to log warn, but it reports not to" << endl; return 1; }
+        if (!Logger::Logging(Severity::error)) { cout << "Logger expected to log error, but it reports not to" << endl; return 1; }
+        if (!Logger::Logging(Severity::fatal)) { cout << "Logger expected to log fatal, but it reports not to" << endl; return 1; }
+
+        cout << "##### removing custom sink with error severity" << endl;
+
+        bool caught = false;
+        try {
+            Logger::AddCustomSink("CustomSink", Severity::error, [](const string& /*content*/, const LogMetaData& /*metadata*/){});
+        } catch (runtime_error& rte) {
+            caught = true;
+        }
+        if (!caught) {
+            throw runtime_error("expected to throw a runtime_error upon adding sink with same key, but none was thrown");
+        }
+
+        Logger::RemoveCustomSink("CustomSink");
+
+        if (Logger::Logging(Severity::warn)) { cout << "Logger expected to NOT log warn, but it reports to do so" << endl; return 1; }
+        if (Logger::Logging(Severity::error)) { cout << "Logger expected to NOT log error, but it reports to do so" << endl; return 1; }
+        if (!Logger::Logging(Severity::fatal)) { cout << "Logger expected to log fatal, but it reports not to" << endl; return 1; }
+
+        caught = false;
+        try {
+            Logger::RemoveCustomSink("bla");
+        } catch (runtime_error& rte) {
+            caught = true;
+        }
+        if (!caught) {
+            throw runtime_error("expected to throw a runtime_error upon removing non-existent sink, but none was thrown");
+        }
+    } catch (runtime_error& rte) {
+        cout << rte.what() << endl;
+        return 1;
+    }
+
+    return 0;
+}

test/threads.cxx

@@ -0,0 +1,67 @@
+/********************************************************************************
+ * Copyright (C) 2014-2020 GSI Helmholtzzentrum fuer Schwerionenforschung GmbH  *
+ *                                                                              *
+ *              This software is distributed under the terms of the             *
+ *              GNU Lesser General Public Licence (LGPL) version 3,             *
+ *                  copied verbatim in the file "LICENSE"                       *
+ ********************************************************************************/
+
+#include "Common.h"
+#include <Logger.h>
+
+#include <iostream>
+#include <thread>
+#include <vector>
+
+using namespace std;
+using namespace fair;
+using namespace fair::logger::test;
+
+void f()
+{
+    LOG(fatal) << "a" << "b" << "c" << "d" << "e" << "f" << "g" << "h" << "i" << "j" << "k" << "l" << "m" << "n" << "o" << "p" << "q" << "r" << "s" << "t" << "u" << "v" << "w" << "x" << "y" << "z";
+}
+
+int main()
+{
+    try {
+        Logger::SetConsoleColor(false);
+        Logger::SetConsoleSeverity(Severity::fatal);
+        Logger::SetVerbosity(Verbosity::veryhigh);
+
+        CheckOutput(
+R"(^\[.*\]\[\d{2}:\d{2}:\d{2}\.\d{6}\]\[FATAL\]\[.*:\d+:.*\] abcdefghijklmnopqrstuvwxyz
+\[.*\]\[\d{2}:\d{2}:\d{2}\.\d{6}\]\[FATAL\]\[.*:\d+:.*\] abcdefghijklmnopqrstuvwxyz
+\[.*\]\[\d{2}:\d{2}:\d{2}\.\d{6}\]\[FATAL\]\[.*:\d+:.*\] abcdefghijklmnopqrstuvwxyz
+\[.*\]\[\d{2}:\d{2}:\d{2}\.\d{6}\]\[FATAL\]\[.*:\d+:.*\] abcdefghijklmnopqrstuvwxyz
+\[.*\]\[\d{2}:\d{2}:\d{2}\.\d{6}\]\[FATAL\]\[.*:\d+:.*\] abcdefghijklmnopqrstuvwxyz
+$)", []() {
+            thread t1(f);
+            thread t2(f);
+            thread t3(f);
+            thread t4(f);
+            thread t5(f);
+            t1.join();
+            t2.join();
+            t3.join();
+            t4.join();
+            t5.join();
+        });
+
+        thread t1(f);
+        thread t2(f);
+        thread t3(f);
+        thread t4(f);
+        thread t5(f);
+        t1.join();
+        t2.join();
+        t3.join();
+        t4.join();
+        t5.join();
+    } catch (runtime_error& rte) {
+        cout << rte.what() << endl;
+        return 1;
+    }
+
+    return 0;
+}

test/verbosity.cxx

@@ -0,0 +1,102 @@
+/********************************************************************************
+ * Copyright (C) 2014-2020 GSI Helmholtzzentrum fuer Schwerionenforschung GmbH  *
+ *                                                                              *
+ *              This software is distributed under the terms of the             *
+ *              GNU Lesser General Public Licence (LGPL) version 3,             *
+ *                  copied verbatim in the file "LICENSE"                       *
+ ********************************************************************************/
+
+#include "Common.h"
+#include <Logger.h>
+
+#include <iostream>
+#include <string>
+
+using namespace std;
+using namespace fair;
+using namespace fair::logger::test;
+
+int main()
+{
+    try {
+        Logger::SetConsoleColor(false);
+        Logger::SetConsoleSeverity(Severity::fatal);
+
+        auto spec1 = VerbositySpec::Make(VerbositySpec::Info::file_line_function, VerbositySpec::Info::process_name);
+        auto spec2 = VerbositySpec::Make(VerbositySpec::Info::process_name, VerbositySpec::Info::file_line_function);
+
+        Logger::DefineVerbosity(Verbosity::user1, spec1);
+        Logger::SetVerbosity(Verbosity::user1); // spec1 on user1
+        CheckOutput(ToStr(R"(^\[.*:\d{2}:.*\]\[.*\])", " content\n$"), []() { LOG(fatal) << "content"; });
+
+        Logger::DefineVerbosity(Verbosity::user1, spec2);
+        Logger::SetVerbosity(Verbosity::user1); // spec2 on user1
+        CheckOutput(ToStr(R"(^\[.*\]\[.*:\d{2}:.*\])", " content\n$"), []() { LOG(fatal) << "content"; });
+
+        Logger::DefineVerbosity(Verbosity::user2, spec1);
+        Logger::SetVerbosity(Verbosity::user2); // spec1 on user2
+        CheckOutput(ToStr(R"(^\[.*:\d{2}:.*\]\[.*\])", " content\n$"), []() { LOG(fatal) << "content"; });
+
+        Logger::SetVerbosity(Verbosity::verylow); // content
+        CheckOutput("^content\n$", []() { LOG(fatal) << "content"; });
+
+        Logger::SetVerbosity(Verbosity::low); // [severity] content
+        CheckOutput(ToStr(R"(^\[FATAL\])", " content\n$"), []() { LOG(fatal) << "content"; });
+
+        Logger::SetVerbosity(Verbosity::medium); // [HH:MM:SS][severity] content
+        CheckOutput(ToStr(R"(^\[\d{2}:\d{2}:\d{2}\]\[FATAL\])", " content\n$"), []() { LOG(fatal) << "content"; });
+
+        Logger::SetVerbosity(Verbosity::high); // [process_name][HH:MM:SS][severity] content
+        CheckOutput(ToStr(R"(^\[.*\]\[\d{2}:\d{2}:\d{2}\]\[FATAL\])", " content\n$"), []() { LOG(fatal) << "content"; });
+
+        Logger::SetVerbosity(Verbosity::veryhigh); // [process_name][HH:MM:SS:µS][severity][file:line:function] content
+        CheckOutput(ToStr(R"(^\[.*\]\[\d{2}:\d{2}:\d{2}\.\d{6}\]\[FATAL\]\[.*:\d+:.*\])", " content\n$"), []() { LOG(fatal) << "content"; });
+
+        Logger::SetConsoleColor(true);
+
+        Logger::SetVerbosity(Verbosity::verylow); // content
+        CheckOutput(
+            "^"
+            "content\n"
+            "$", []() { LOG(fatal) << "content"; });
+
+        Logger::SetVerbosity(Verbosity::low); // [severity] content
+        CheckOutput(
+            "^"
+            "\\[\033\\[01;31mFATAL\033\\[0m\\]"
+            " content\n"
+            "$", []() { LOG(fatal) << "content"; });
+
+        Logger::SetVerbosity(Verbosity::medium); // [HH:MM:SS][severity] content
+        CheckOutput(
+            "^"
+            "\\[\033\\[01;36m\\d{2}:\\d{2}:\\d{2}\033\\[0m\\]"
+            "\\[\033\\[01;31mFATAL\033\\[0m\\]"
+            " content\n"
+            "$", []() { LOG(fatal) << "content"; });
+
+        Logger::SetVerbosity(Verbosity::high); // [process_name][HH:MM:SS][severity] content
+        CheckOutput(
+            "^"
+            "\\[\033\\[01;34m.*\033\\[0m\\]"
+            "\\[\033\\[01;36m\\d{2}:\\d{2}:\\d{2}\033\\[0m\\]"
+            "\\[\033\\[01;31mFATAL\033\\[0m\\]"
+            " content\n"
+            "$", []() { LOG(fatal) << "content"; });
+
+        Logger::SetVerbosity(Verbosity::veryhigh); // [process_name][HH:MM:SS:µS][severity][file:line:function] content
+        CheckOutput(
+            "^"
+            "\\[\033\\[01;34m.*\033\\[0m\\]"
+            "\\[\033\\[01;36m\\d{2}:\\d{2}:\\d{2}\\.\\d{6}\033\\[0m\\]"
+            "\\[\033\\[01;31mFATAL\033\\[0m\\]"
+            "\\[\033\\[01;34m.*\033\\[0m:\033\\[01;33m\\d+\033\\[0m:\033\\[01;34m.*\033\\[0m\\]"
+            " content\n"
+            "$", []() { LOG(fatal) << "content"; });
+    } catch (runtime_error& rte) {
+        cout << rte.what() << endl;
+        return 1;
+    }
+
+    return 0;
+}