1. Fixed file_helper::exists() bug under windows which returned false in some circumstances

2. Improved file_helper::exists() performance under linux to use stat sys call
3. Added unit tests

tests/file_log.cpp

@@ -35,16 +35,6 @@ std::ifstream::pos_type filesize(const std::string& filename)
     return ifs.tellg();
 }
 
-static void prepare_logdir()
-{
-    spdlog::drop_all();
-#ifdef _WIN32
-    auto rv = system("del /F /Q logs\\*");
-#else
-    auto rv = system("rm -f logs/*");
-#endif
-}
-
 
 
 TEST_CASE("simple_file_logger", "[simple_logger]]")

tests/includes.h

@@ -10,3 +10,14 @@
 #include "catch.hpp"
 #include "../include/spdlog/spdlog.h"
 #include "../include/spdlog/sinks/null_sink.h"
+
+
+static void prepare_logdir()
+{
+    spdlog::drop_all();
+#ifdef _WIN32
+    auto rv = system("del /F /Q logs\\*");
+#else
+    auto rv = system("rm -f logs/*");
+#endif
+}

tests/tests.vcxproj

@@ -82,6 +82,7 @@
       <WarningLevel>Level3</WarningLevel>
       <Optimization>Disabled</Optimization>
       <SDLCheck>true</SDLCheck>
+      <PreprocessorDefinitions>_MBCS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
     </ClCompile>
     <Link>
       <GenerateDebugInformation>true</GenerateDebugInformation>
@@ -110,6 +111,7 @@
       <FunctionLevelLinking>true</FunctionLevelLinking>
       <IntrinsicFunctions>true</IntrinsicFunctions>
       <SDLCheck>true</SDLCheck>
+      <PreprocessorDefinitions>_MBCS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
     </ClCompile>
     <Link>
       <GenerateDebugInformation>true</GenerateDebugInformation>
@@ -119,6 +121,7 @@
     </Link>
   </ItemDefinitionGroup>
   <ItemGroup>
+    <ClCompile Include="file_helper.cpp" />
     <ClCompile Include="file_log.cpp" />
     <ClCompile Include="format.cpp" />
     <ClCompile Include="main.cpp" />

tests/tests.vcxproj.filters

@@ -27,6 +27,9 @@
     <ClCompile Include="registry.cpp">
       <Filter>Source Files</Filter>
     </ClCompile>
+    <ClCompile Include="file_helper.cpp">
+      <Filter>Source Files</Filter>
+    </ClCompile>
   </ItemGroup>
   <ItemGroup>
     <ClInclude Include="includes.h">