diff --git a/build/build_app_msvc_win32_debug.bat b/build/build_app_msvc_win32_debug.bat
index d69d5db..663ae28 100644
--- a/build/build_app_msvc_win32_debug.bat
+++ b/build/build_app_msvc_win32_debug.bat
@@ -34,6 +34,11 @@ cl %CommonCompilerFlags% %ProjectDevPath%\src\serial_monitor\first.cpp /Feserial
 
 cl %CommonCompilerFlags% %ProjectDevPath%\src\sculpture_gen\gen_blumen_lumen.cpp /Fegen_blumen_lumen.exe /link %CommonLinkerFlags% user32.lib winmm.lib gdi32.lib
 
+REM COMPILE AND RUN TESTS
+cl %CommonCompilerFlags% %ProjectDevPath%\src\tests\sanity_tests.cpp /Fesanity_tests.exe /link %CommonLinkerFlags% user32.lib winmm.lib gdi32.lib
+
+sanity_tests.exe
+
 popd
 
 call %MyPath%\_postbuild_win32.bat
\ No newline at end of file
diff --git a/src/app/blumen_lumen.cpp b/src/app/blumen_lumen.cpp
index 68aa25a..4f9791c 100644
--- a/src/app/blumen_lumen.cpp
+++ b/src/app/blumen_lumen.cpp
@@ -126,7 +126,9 @@ BlumenLumen_CustomInit(app_state* State, context Context)
     BLState->MicListenJobData.OutgoingMsgQueue = &BLState->OutgoingMsgQueue;
     BLState->MicListenJobData.ListenSocket = CreateSocket(Context.SocketManager, "127.0.0.1", "20185");
     
+#if 0
     BLState->MicListenThread = CreateThread(Context.ThreadManager, BlumenLumen_MicListenJob, (u8*)&BLState->MicListenJobData);
+#endif
     
     gs_const_string SculpturePath = ConstString("data/test_blumen.fold");
     LoadAssembly(&State->Assemblies, &State->LedSystem, State->Transient, Context, SculpturePath, State->GlobalLog);
diff --git a/src/app/editor/panels/foldhaus_panel_animation_timeline.h b/src/app/editor/panels/foldhaus_panel_animation_timeline.h
index 92ee12c..6464628 100644
--- a/src/app/editor/panels/foldhaus_panel_animation_timeline.h
+++ b/src/app/editor/panels/foldhaus_panel_animation_timeline.h
@@ -792,6 +792,29 @@ TimeRange_Render(animation_timeline_state* TimelineState, rect2 Bounds, render_c
     }
 }
 
+internal void
+AnimInfoView_SaveAnimFile (gs_const_string Path, app_state* State, context Context)
+{
+    u32 ActiveAnimIndex = State->AnimationSystem.ActiveAnimationIndex;
+    animation ActiveAnimation = State->AnimationSystem.Animations.Values[ActiveAnimIndex];
+    
+    gs_string FileText = AnimSerializer_Serialize(ActiveAnimation, State->Patterns, State->Transient);
+    
+    if (!WriteEntireFile(Context.ThreadContext.FileHandler, Path, StringToData(FileText)))
+    {
+        InvalidCodePath;
+    }
+}
+
+PANEL_MODAL_OVERRIDE_CALLBACK(AnimInfoView_SaveAnimFileCallback)
+{
+    Assert(ReturningFrom->TypeIndex == PanelType_FileView);
+    file_view_state* FileViewState = Panel_GetStateStruct(ReturningFrom, file_view_state);
+    gs_file_info FileInfo = FileViewState->SelectedFile;
+    
+    AnimInfoView_SaveAnimFile(FileInfo.Path, State, Context);
+}
+
 internal void
 AnimInfoView_Render(animation_timeline_state* TimelineState, rect2 Bounds, panel* Panel, render_command_buffer* RenderBuffer, app_state* State, context Context)
 {
@@ -833,10 +856,14 @@ AnimInfoView_Render(animation_timeline_state* TimelineState, rect2 Bounds, panel
             // need to use the file browser to create a file
             u32 ActiveAnimIndex = State->AnimationSystem.ActiveAnimationIndex;
             animation ActiveAnimation = State->AnimationSystem.Animations.Values[ActiveAnimIndex];
-            gs_string FileText = AnimSerializer_Serialize(ActiveAnimation, State->Patterns, State->Transient);
-            if (WriteEntireFile(Context.ThreadContext.FileHandler, ActiveAnimation.FileInfo.Path, StringToData(FileText)))
+            
+            if (!ActiveAnimation.FileInfo.Path.Str)
             {
-                InvalidCodePath;
+                panel* FileBrowser = PanelSystem_PushPanel(&State->PanelSystem, PanelType_FileView, State, Context);
+                FileView_SetMode(FileBrowser, FileViewMode_Save);
+                Panel_PushModalOverride(Panel, FileBrowser, AnimInfoView_SaveAnimFileCallback);
+            } else {
+                AnimInfoView_SaveAnimFile(ActiveAnimation.FileInfo.Path, State, Context);
             }
         }
         if (ui_Button(Interface, MakeString("Load")))
diff --git a/src/app/editor/panels/foldhaus_panel_file_view.h b/src/app/editor/panels/foldhaus_panel_file_view.h
index eaf5013..aee1c19 100644
--- a/src/app/editor/panels/foldhaus_panel_file_view.h
+++ b/src/app/editor/panels/foldhaus_panel_file_view.h
@@ -49,30 +49,31 @@ s32 FileView_CommandsCount = 0;
 internal void
 FileView_UpdateWorkingDirectory(gs_const_string WorkingDirectory, file_view_state* State, context Context)
 {
+    // NOTE(pjs): make sure we're only passing valid directory paths to the
+    // function
+    char LastChar = WorkingDirectory.Str[WorkingDirectory.Length - 1];
+    Assert(LastChar == '\\' || LastChar == '/');
     ClearArena(&State->FileNamesArena);
     
-    gs_const_string SanitizedDirectory = WorkingDirectory;
-    
-    u32 LastSlashIndex = FindLast(SanitizedDirectory, '\\');
-    gs_const_string LastDir = Substring(SanitizedDirectory, LastSlashIndex + 1, SanitizedDirectory.Length);
-    if (StringsEqual(LastDir, ConstString("..")))
+    gs_string SanitizedDir = PushString(Context.ThreadContext.Transient, WorkingDirectory.Length + 2);
+    SanitizePath(WorkingDirectory, &SanitizedDir, Context.ThreadContext.Transient);
+    if (SanitizedDir.Str[SanitizedDir.Length - 1] != '\\')
     {
-        u32 SecondLastSlashIndex = FindLast(SanitizedDirectory, LastSlashIndex - 1, '\\');
-        SanitizedDirectory = Substring(SanitizedDirectory, 0, SecondLastSlashIndex);
-    }
-    else if (StringsEqual(LastDir, ConstString(".")) && LastDir.Length > 1)
-    {
-        SanitizedDirectory = Substring(SanitizedDirectory, 0, LastSlashIndex);
+        AppendPrintF(&SanitizedDir, "\\");
     }
     
-    gs_file_info NewWorkingDirectory = GetFileInfo(Context.ThreadContext.FileHandler, SanitizedDirectory);
-    if (NewWorkingDirectory.IsDirectory)
+    gs_file_info NewWorkingDir = GetFileInfo(Context.ThreadContext.FileHandler, SanitizedDir.ConstString);
+    if (NewWorkingDir.IsDirectory)
     {
+        AppendPrintF(&SanitizedDir, "*");
+        NullTerminate(&SanitizedDir);
+        
+        State->FileNames = EnumerateDirectory(Context.ThreadContext.FileHandler, &State->FileNamesArena, SanitizedDir.ConstString, EnumerateDirectory_IncludeDirectories);
+        
         // NOTE(pjs): we might be printing from State->WorkingDirectory to State->WorkingDirectory
         // in some cases. Shouldn't be a problem but it is unnecessary
-        PrintF(&State->WorkingDirectory, "%S", WorkingDirectory);
+        PrintF(&State->WorkingDirectory, "%S", SanitizedDir.ConstString);
         
-        State->FileNames = EnumerateDirectory(Context.ThreadContext.FileHandler, &State->FileNamesArena, State->WorkingDirectory.ConstString, EnumerateDirectory_IncludeDirectories);
     }
 }
 
@@ -88,7 +89,7 @@ FileView_Init(panel* Panel, app_state* State, context Context)
     
     // TODO(pjs): this shouldn't be stored in permanent
     FileViewState->WorkingDirectory = PushString(&State->Permanent, 256);
-    FileView_UpdateWorkingDirectory(ConstString("."), FileViewState, Context);
+    FileView_UpdateWorkingDirectory(ConstString(".\\"), FileViewState, Context);
 }
 
 GSMetaTag(panel_cleanup);
@@ -105,14 +106,26 @@ internal void
 FileView_Render(panel* Panel, rect2 PanelBounds, render_command_buffer* RenderBuffer, app_state* State, context Context)
 {
     file_view_state* FileViewState = Panel_GetStateStruct(Panel, file_view_state);
-    Assert(FileViewState->Mode == FileViewMode_Save);
     
     ui_PushLayout(&State->Interface, PanelBounds, LayoutDirection_TopDown, MakeString("FileView Layout"));
     {
-        if (ui_Button(&State->Interface, MakeString("Exit")))
+        
+        ui_BeginRow(&State->Interface, 3);
         {
-            FileView_Exit_(Panel, State, Context);
+            if (FileViewState->Mode == FileViewMode_Save)
+            {
+                if (ui_Button(&State->Interface, MakeString("Save")))
+                {
+                    FileView_Exit_(Panel, State, Context);
+                }
+            }
+            
+            if (ui_Button(&State->Interface, MakeString("Exit")))
+            {
+                FileView_Exit_(Panel, State, Context);
+            }
         }
+        ui_EndRow(&State->Interface);
         
         // Header
         if (ui_TextEntry(&State->Interface, MakeString("pwd"), &FileViewState->WorkingDirectory))
@@ -137,7 +150,7 @@ FileView_Render(panel* Panel, rect2 PanelBounds, render_command_buffer* RenderBu
         {
             gs_file_info File = FileViewState->FileNames.Values[i];
             
-            u32 LastSlashIndex = FindLast(File.Path, '\\');
+            u32 LastSlashIndex = FindLast(File.Path, File.Path.Length - 2, '\\');
             gs_const_string FileName = Substring(File.Path, LastSlashIndex + 1, File.Path.Length);
             gs_string PathString = PushString(State->Transient, FileName.Length);
             PrintF(&PathString, "%S", FileName);
@@ -150,8 +163,19 @@ FileView_Render(panel* Panel, rect2 PanelBounds, render_command_buffer* RenderBu
                 }
                 else
                 {
-                    FileViewState->SelectedFile = File;
-                    FileView_Exit_(Panel, State, Context);
+                    switch (FileViewState->Mode)
+                    {
+                        FileViewState->SelectedFile = File;
+                        case FileViewMode_Load:
+                        {
+                            FileView_Exit_(Panel, State, Context);
+                        } break;
+                        
+                        case FileViewMode_Save:
+                        {
+                            
+                        } break;
+                    }
                 }
             }
         }
diff --git a/src/app/editor/panels/foldhaus_panel_hierarchy.h b/src/app/editor/panels/foldhaus_panel_hierarchy.h
index 13d45fe..7979512 100644
--- a/src/app/editor/panels/foldhaus_panel_hierarchy.h
+++ b/src/app/editor/panels/foldhaus_panel_hierarchy.h
@@ -69,7 +69,7 @@ HierarchyView_Render(panel* Panel, rect2 PanelBounds, render_command_buffer* Ren
         if (ui_Button(&State->Interface, MakeString("+ Add Assembly")))
         {
             panel* FileBrowser = PanelSystem_PushPanel(&State->PanelSystem, PanelType_FileView, State, Context);
-            FileView_SetMode(FileBrowser, FileViewMode_Save);
+            FileView_SetMode(FileBrowser, FileViewMode_Load);
             Panel_PushModalOverride(Panel, FileBrowser, LoadAssemblyCallback);
         }
         ui_EndRow(&State->Interface);
diff --git a/src/app/foldhaus_app.cpp b/src/app/foldhaus_app.cpp
index 13f5dc5..9112a93 100644
--- a/src/app/foldhaus_app.cpp
+++ b/src/app/foldhaus_app.cpp
@@ -57,7 +57,7 @@ INITIALIZE_APPLICATION(InitializeApplication)
     State->LedSystem = LedSystem_Create(Context.ThreadContext.Allocator, 128);
     State->AssemblyDebugState = AssemblyDebug_Create(&State->Permanent);
     State->AssemblyDebugState.Brightness = 255;
-    State->AssemblyDebugState.Override = ADS_Override_AllBlue;
+    State->AssemblyDebugState.Override = ADS_Override_None;
     
     GlobalDebugServices->Interface.RenderSculpture = true;
     
@@ -80,7 +80,7 @@ INITIALIZE_APPLICATION(InitializeApplication)
         Panel_SetType(Profiler, &State->PanelSystem, PanelType_ProfilerView, State, Context);
         
         panel* Hierarchy = LeftPanel->Left;
-        Panel_SetType(Hierarchy, &State->PanelSystem, PanelType_HierarchyView, State, Context);
+        Panel_SetType(Hierarchy, &State->PanelSystem, PanelType_AssemblyDebug, State, Context);
         
     }
     
diff --git a/src/app/foldhaus_platform.h b/src/app/foldhaus_platform.h
index 7f10ab0..35a539d 100644
--- a/src/app/foldhaus_platform.h
+++ b/src/app/foldhaus_platform.h
@@ -11,6 +11,7 @@
 
 #include "..\gs_libs\gs_types.h"
 #include "..\gs_libs\gs_types.cpp"
+#include "..\gs_libs\gs_path.h"
 
 struct handle
 {
diff --git a/src/app/platform_win32/win32_foldhaus.cpp b/src/app/platform_win32/win32_foldhaus.cpp
index df968c8..e959107 100644
--- a/src/app/platform_win32/win32_foldhaus.cpp
+++ b/src/app/platform_win32/win32_foldhaus.cpp
@@ -523,6 +523,8 @@ SetWorkingDirectory(HINSTANCE HInstance, gs_thread_context ThreadContext)
     return Result;
 }
 
+#include "../../gs_libs/gs_path.h"
+
 int WINAPI
 WinMain (
          HINSTANCE HInstance,
@@ -533,6 +535,11 @@ WinMain (
 {
     gs_thread_context ThreadContext = Win32CreateThreadContext();
     
+    gs_file_info A = GetFileInfo(ThreadContext.FileHandler, ConstString("C:\\projects\\Lumenarium"));
+    
+    gs_file_info B = GetFileInfo(ThreadContext.FileHandler, ConstString("C:\\projects\\Lumenarium\\"));
+    
+    
     if (!SetWorkingDirectory(HInstance, ThreadContext)) return 1;
     
     MainWindow = Win32CreateWindow (HInstance, "Foldhaus", 1440, 768, HandleWindowEvents);
@@ -629,7 +636,7 @@ WinMain (
         
         Context.UpdateAndRender(&Context, InputQueue, &RenderBuffer, &OutputData);
         
-        bool Multithread = false;
+        bool Multithread = true;
         if (Multithread)
         {
             for (addressed_data_buffer* At = OutputData.Root;
diff --git a/src/app/platform_win32/win32_foldhaus_fileio.h b/src/app/platform_win32/win32_foldhaus_fileio.h
index 95163ea..a4f3edf 100644
--- a/src/app/platform_win32/win32_foldhaus_fileio.h
+++ b/src/app/platform_win32/win32_foldhaus_fileio.h
@@ -178,28 +178,39 @@ Win32SetFileInfoFromFindFileData(gs_file_info* Info, WIN32_FIND_DATA FindFileDat
 {
     u32 FileNameLength = CharArrayLength(FindFileData.cFileName);
     
-    // NOTE(Peter): String Storage
-    // Storing the string in the final storage means we don't have to copy the string later, and all
-    // strings will be continguous in memory at the calling site, though they will be before the array
-    gs_string FileName = PushString(Storage, SearchPath.Length + FileNameLength + 1);
-    PrintF(&FileName, "%S%.*s", SearchPath, FileName.Size, FindFileData.cFileName);
-    NullTerminate(&FileName);
-    
     Info->FileSize = Win32HighLowToU64(FindFileData.nFileSizeLow, FindFileData.nFileSizeHigh);
     Info->CreationTime = Win32FileTimeToU64(FindFileData.ftCreationTime);
     Info->LastWriteTime = Win32FileTimeToU64(FindFileData.ftLastWriteTime);
-    Info->Path = FileName.ConstString;
     Info->IsDirectory = HasFlag(FindFileData.dwFileAttributes, FILE_ATTRIBUTE_DIRECTORY);
+    
+    // NOTE(Peter): String Storage
+    // Storing the string in the final storage means we don't have to copy the string later, and all
+    // strings will be continguous in memory at the calling site, though they will be before the array
+    gs_string FileName = PushString(Storage, SearchPath.Length + FileNameLength + 2);
+    PrintF(&FileName, "%S%.*s", SearchPath, FileName.Size, FindFileData.cFileName);
+    if (Info->IsDirectory)
+    {
+        AppendPrintF(&FileName, "\\");
+    }
+    NullTerminate(&FileName);
+    
+    Info->Path = FileName.ConstString;
 }
 
 internal u32
 Win32EnumerateDirectoryIntoTempList(gs_file_handler FileHandler, temp_file_list* TempList, gs_const_string Path, gs_memory_arena* Storage, b32 Flags)
 {
     u32 FilesCount = 0;
+    Assert(Path.Str[Path.Length - 1] != '\\' &&
+           Path.Str[Path.Length - 1] != '/');
+    gs_const_string SearchPath = Path;
     
-    s64 IndexOfLastSlash = FindLastFromSet(Path, "\\/");
-    Assert(IndexOfLastSlash >= 0);
-    gs_const_string SearchPath = Substring(Path, 0, IndexOfLastSlash + 1);
+    gs_const_string SearchPathDir = SearchPath;
+    s64 LastSlash = FindLastFromSet(SearchPath, "\\/");
+    if (LastSlash >= 0)
+    {
+        SearchPathDir = Substring(SearchPath, 0, LastSlash + 1);
+    }
     
     WIN32_FIND_DATA FindFileData;
     HANDLE SearchHandle = FindFirstFile(Path.Str, &FindFileData);
@@ -211,15 +222,18 @@ Win32EnumerateDirectoryIntoTempList(gs_file_handler FileHandler, temp_file_list*
             
             if (HasFlag(FindFileData.dwFileAttributes, FILE_ATTRIBUTE_DIRECTORY))
             {
+                gs_const_string SubDirName = ConstString(FindFileData.cFileName);
+                bool IsNav = (StringsEqual(SubDirName, ConstString(".")) ||
+                              StringsEqual(SubDirName, ConstString("..")));
+                
                 if (HasFlag(Flags, EnumerateDirectory_Recurse))
                 {
-                    gs_const_string SubDirName = ConstString(FindFileData.cFileName);
-                    if (!StringsEqual(SubDirName, ConstString(".")) &&
-                        !StringsEqual(SubDirName, ConstString("..")))
+                    if (!IsNav)
                     {
                         gs_string SubDirectoryPath = PushString(FileHandler.Transient, SearchPath.Length + SubDirName.Length + 3);
                         PrintF(&SubDirectoryPath, "%S%S/*\0", SearchPath, SubDirName);
-                        FilesCount += Win32EnumerateDirectoryIntoTempList(FileHandler, TempList, SubDirectoryPath.ConstString, Storage, Flags);
+                        FilesCount += Win32EnumerateDirectoryIntoTempList(FileHandler, TempList, SubDirectoryPath.ConstString,
+                                                                          Storage, Flags);
                     }
                 }
                 
@@ -230,7 +244,7 @@ Win32EnumerateDirectoryIntoTempList(gs_file_handler FileHandler, temp_file_list*
             {
                 temp_file_list_entry* File = PushStruct(FileHandler.Transient, temp_file_list_entry);
                 *File = {0};
-                Win32SetFileInfoFromFindFileData(&File->Info, FindFileData, SearchPath, Storage);
+                Win32SetFileInfoFromFindFileData(&File->Info, FindFileData, SearchPathDir, Storage);
                 SLLPushOrInit(TempList->First, TempList->Last, File);
                 FilesCount += 1;
             }
diff --git a/src/app/platform_win32/win32_foldhaus_serial.h b/src/app/platform_win32/win32_foldhaus_serial.h
index 71b4c99..7f21539 100644
--- a/src/app/platform_win32/win32_foldhaus_serial.h
+++ b/src/app/platform_win32/win32_foldhaus_serial.h
@@ -146,6 +146,11 @@ Win32SerialPort_Write(HANDLE PortHandle, gs_data Buffer)
                 // ie. the usb stick was removed
             }break;
             
+            case ERROR_ACCESS_DENIED:
+            {
+                // ??
+            }break;
+            
             case ERROR_INVALID_HANDLE:
             InvalidDefaultCase;
         }
diff --git a/src/gs_libs/gs_path.h b/src/gs_libs/gs_path.h
new file mode 100644
index 0000000..ebcbb7b
--- /dev/null
+++ b/src/gs_libs/gs_path.h
@@ -0,0 +1,106 @@
+//
+// File: gs_path.h
+// Author: Peter Slattery
+// Creation Date: 2021-03-06
+//
+#ifndef GS_PATH_H
+
+internal gs_const_string
+ClearString()
+{
+    gs_const_string R = {};
+    R.Str = 0;
+    R.Length = 0;
+    return R;
+}
+
+internal void
+SanitizePath (gs_const_string Path, gs_string* Dest, gs_memory_arena* Scratch)
+{
+    Dest->Length = 0;
+    
+    // Put all slashes in the same format
+    s32 SlashCount = 0;
+    for (u64 i = 0; i < Path.Length; i++)
+    {
+        char At = Path.Str[i];
+        if (At == '\\' || At == '/') {
+            SlashCount += 1;
+        }
+    }
+    
+    // we add one to slash count in case the last element is a file or
+    // doesn't end in a slash (even if it should)
+    u32 PathEleCountMax = SlashCount + 1;
+    u32 PathEleCount = 0;
+    gs_const_string* PathEle = PushArray(Scratch, gs_const_string, PathEleCountMax);
+    
+    u64 OnePastLastEleEnd = 0;
+    for (s64 i = 0; i < (s64)Path.Length; i++)
+    {
+        char At = Path.Str[i];
+        if (At == '\\' || At == '/')
+        {
+            gs_const_string* NewEle = PathEle + PathEleCount++;
+            *NewEle = Substring(Path, OnePastLastEleEnd, i + 1);
+            OnePastLastEleEnd = i + 1;
+        }
+    }
+    
+    if (OnePastLastEleEnd != Path.Length)
+    {
+        gs_const_string* NewEle = PathEle + PathEleCount++;
+        *NewEle = Substring(Path, OnePastLastEleEnd, Path.Length);
+        OnePastLastEleEnd = Path.Length;
+    }
+    
+    // Remove redundant elements
+    for (u32 i = 0; i < PathEleCount; i++)
+    {
+        gs_const_string* At = PathEle + i;
+        bool ShouldRemove = false;
+        if (i != 0)
+        {
+            if (StringsEqual(*At, ConstString(".\\")) ||
+                StringsEqual(*At, ConstString("./")))
+            {
+                *At = ClearString();
+            }
+            else if (StringsEqual(*At, ConstString("..\\")) ||
+                     StringsEqual(*At, ConstString("../")))
+            {
+                PathEle[i - 1] = ClearString();
+                if (i != 1) {
+                    PathEle[i] = ClearString();
+                }
+            }
+        }
+    }
+    
+    for (u32 i = 0; i < PathEleCount; i++)
+    {
+        if (PathEle[i].Str) {
+            AppendPrintF(Dest, "%S", PathEle[i]);
+        }
+    }
+    
+    // Put all slashes in the same format
+    for (u64 i = 0; i < Dest->Length; i++)
+    {
+        if (Dest->Str[i] == '/') {
+            Dest->Str[i] = '\\';
+        }
+    }
+}
+
+internal gs_const_string
+SanitizePath (gs_const_string Path, gs_memory_arena* Scratch)
+{
+    gs_string Result = PushString(Scratch, Path.Length);
+    SanitizePath(Path, &Result, Scratch);
+    return Result.ConstString;
+}
+
+
+#define GS_PATH_H
+#endif // GS_PATH_H
\ No newline at end of file
diff --git a/src/gs_libs/gs_tests.h b/src/gs_libs/gs_tests.h
new file mode 100644
index 0000000..7a38fb5
--- /dev/null
+++ b/src/gs_libs/gs_tests.h
@@ -0,0 +1,72 @@
+//
+// File: gs_tests.h
+// Author: Peter Slattery
+// Creation Date: 2021-03-06
+//
+#ifndef GS_TESTS_H
+
+int CStringLen(char* Str)
+{
+    char* At = Str;
+    while (*At != 0) { At++; }
+    int Result = At - Str;
+    return Result;
+}
+
+struct test_ctx
+{
+    int TestsCount;
+    int TestsPassedCount;
+};
+
+static test_ctx TestCtx = {0};
+
+static void
+BeginTest(char* Name)
+{
+    int Length = CStringLen(Name);
+    int Spaces = 25 - Length;
+    if(Spaces < 0)
+    {
+        Spaces = 0;
+    }
+    printf("\"%s\" %.*s [", Name, Spaces, "------------------------------");
+    TestCtx.TestsCount = 0;
+    TestCtx.TestsPassedCount = 0;
+}
+
+static void
+TestResult(bool Result)
+{
+    TestCtx.TestsCount += 1;
+    if (Result) {
+        TestCtx.TestsPassedCount += 1;
+    }
+    printf(Result ? "." : "X");
+}
+
+static void
+EndTest(void)
+{
+    int Spaces = 10 - TestCtx.TestsCount;
+    if(Spaces < 0) { Spaces = 0; }
+    printf("]%.*s ", Spaces, "                                      ");
+    printf("[%i/%i] %i passed, %i tests, ",
+           TestCtx.TestsPassedCount, TestCtx.TestsCount,
+           TestCtx.TestsPassedCount, TestCtx.TestsCount);
+    if(TestCtx.TestsCount == TestCtx.TestsPassedCount)
+    {
+        printf("SUCCESS ( )");
+    }
+    else
+    {
+        printf("FAILED  (X)");
+    }
+    printf("\n");
+}
+
+#define Test(name) for(int _i_ = (BeginTest(name), 0); !_i_; _i_ += 1, EndTest())
+
+
+#define GS_TESTS_H
+#endif // GS_TESTS_H
\ No newline at end of file
diff --git a/src/sculpture_gen/gen_blumen_lumen.cpp b/src/sculpture_gen/gen_blumen_lumen.cpp
index dce5c4a..d1f4462 100644
--- a/src/sculpture_gen/gen_blumen_lumen.cpp
+++ b/src/sculpture_gen/gen_blumen_lumen.cpp
@@ -191,7 +191,7 @@ int main(int ArgCount, char** Args)
     u32 BloomInnerChannels[] = { FSC(0, 0), FSC(0, 1), FSC(0, 2), FSC(0, 3), FSC(0, 4), FSC(0, 5) };
     flower_desc F0 = {};
     F0.Pos = v3{-1, 0, 0};
-    F0.ComPort = "\\\\.\\COM4";
+    F0.ComPort = "\\\\.\\COM11";
     F0.FlowerTagValue = "left";
     F0.StemChannels = StemChannels;
     F0.BloomOuterChannels = BloomOuterChannels;
@@ -200,7 +200,7 @@ int main(int ArgCount, char** Args)
     
     flower_desc F1 = {};
     F1.Pos = v3{0, 0, 0};
-    F1.ComPort = "\\\\.\\COM5";
+    F1.ComPort = "\\\\.\\COM12";
     F1.FlowerTagValue = "center";
     F1.StemChannels = StemChannels;
     F1.BloomInnerChannels = BloomInnerChannels;
diff --git a/src/tests/sanity_tests.cpp b/src/tests/sanity_tests.cpp
new file mode 100644
index 0000000..281c1af
--- /dev/null
+++ b/src/tests/sanity_tests.cpp
@@ -0,0 +1,43 @@
+//
+// File: sanity_tests.cpp
+// Author: Peter Slattery
+// Creation Date: 2021-03-06
+//
+#ifndef SANITY_TESTS_CPP
+
+#include <stdio.h>
+#include "../gs_libs/gs_types.h"
+#include "../gs_libs/gs_types.cpp"
+#include "../gs_libs/gs_tests.h"
+
+#include "../gs_libs/gs_path.h"
+
+gs_memory_arena Scratch = {};
+void* Alloc(u64 Size, u64* ResultSize) { *ResultSize = Size; return malloc(Size); }
+void Free(void* Ptr, u64 Size) { return free(Ptr); }
+
+bool PathTest (char* In, char* Out) {
+    return StringsEqual(SanitizePath(ConstString(In), &Scratch), ConstString(Out));
+}
+
+int main (int ArgCount, char** Args)
+{
+    Scratch = CreateMemoryArena(CreateAllocator(Alloc, Free));
+    
+    Test("gs_path.h")
+    {
+        TestResult(PathTest(".", "."));
+        TestResult(PathTest(".\\", ".\\"));
+        TestResult(PathTest("./", ".\\"));
+        TestResult(PathTest("./../", "..\\"));
+        TestResult(PathTest("C:/users/pslattery\\test.foo", "C:\\users\\pslattery\\test.foo"));
+        TestResult(PathTest("./test/../foo.bar", ".\\foo.bar"));
+        TestResult(PathTest("C:\\hello\\world\\.\\test", "C:\\hello\\world\\test"));
+    }
+    
+    return 0;
+}
+
+
+#define SANITY_TESTS_CPP
+#endif // SANITY_TESTS_CPP
\ No newline at end of file