Fixed tests solution for visual studio

tests/tests.vcxproj

@@ -83,6 +83,7 @@
       <Optimization>Disabled</Optimization>
       <SDLCheck>true</SDLCheck>
       <PreprocessorDefinitions>_MBCS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <AdditionalIncludeDirectories>$(SolutionDir)..\include;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
     </ClCompile>
     <Link>
       <GenerateDebugInformation>true</GenerateDebugInformation>
@@ -112,6 +113,7 @@
       <IntrinsicFunctions>true</IntrinsicFunctions>
       <SDLCheck>true</SDLCheck>
       <PreprocessorDefinitions>_MBCS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <AdditionalIncludeDirectories>$(SolutionDir)..\include;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
     </ClCompile>
     <Link>
       <GenerateDebugInformation>true</GenerateDebugInformation>

tests/utils.cpp

@@ -4,9 +4,9 @@ void prepare_logdir()
 {
     spdlog::drop_all();
 #ifdef _WIN32
-    auto rv = system("del /F /Q logs\\*");
+    system("del /F /Q logs\\*");
 #else
-    auto rv = system("rm -f logs/*");
+    system("rm -f logs/*");
 #endif
 }