Add mock print implementation for unit tests

Software/src/devboard/utils/logging.h

@@ -1,12 +1,15 @@
 #ifndef __LOGGING_H__
 #define __LOGGING_H__
 
-#include <Print.h>
 #include <inttypes.h>
 #include "../../../USER_SETTINGS.h"
 #include "../../datalayer/datalayer.h"
 #include "types.h"
 
+#ifndef UNIT_TEST
+// Real implementation for production
+#include <Print.h>
+
 class Logging : public Print {
   void add_timestamp(size_t size);
 
@@ -17,9 +20,7 @@ class Logging : public Print {
   Logging() {}
 };
 
-extern Logging logging;
-
-// Replace compile-time macros with runtime checks
+// Production macros
 #define DEBUG_PRINTF(fmt, ...)                                                                  \
   do {                                                                                          \
     if (datalayer.system.info.web_logging_active || datalayer.system.info.usb_logging_active) { \
@@ -33,4 +34,34 @@ extern Logging logging;
       logging.println(str);                                                                     \
     }                                                                                           \
   } while (0)
+
+#else
+// Mock implementation for tests
+#include <cstdarg>
+#include <cstdio>
+
+class Logging {
+ public:
+  // Mock methods that do nothing
+  size_t write(const uint8_t* buffer, size_t size) { return size; }
+  size_t write(uint8_t) { return 0; }
+
+  static void printf(const char* fmt, ...) {
+    // Empty implementation - silence unused parameter warnings
+    (void)fmt;
+  }
+
+  static void println(const char* str) { (void)str; }
+
+  Logging() {}
+};
+
+// Test macros - empty implementations
+#define DEBUG_PRINTF(fmt, ...) ((void)0)
+#define DEBUG_PRINTLN(str) ((void)0)
+
+#endif
+
+extern Logging logging;
+
 #endif  // __LOGGING_H__

test/CMakeLists.txt

@@ -28,6 +28,7 @@ ExternalProject_Get_Property(gtest source_dir binary_dir)
 # Create a libgtest target to be used as a dependency by test programs
 add_library(libgtest IMPORTED STATIC GLOBAL)
 add_dependencies(libgtest gtest)
+add_definitions(-DUNIT_TEST)
 
 # Set libgtest properties
 if(WIN32)

test/emul/Logging.cpp

@@ -1,3 +1,4 @@
-#include "Logging.h"
+#include "../../src/devboard/utils/logging.h"
 
+// This creates the global instance that links against the real implementation
 Logging logging;

test/emul/Logging.h

@@ -1,22 +1,4 @@
 #pragma once
 
-#include <cstdarg>
-#include <cstdio>
-
-namespace test {
-class Logging {
- public:
-  static void printf(const char* format, ...) {
-    va_list args;
-    va_start(args, format);
-    vprintf(format, args);
-    va_end(args);
-  }
-
-  static void println(const char* message) { printf("%s\n", message); }
-  static void print(const char* message) { printf("%s", message); }
-};
-}  // namespace test
-
-using Logging = test::Logging;
-extern Logging logging;
+// Include the real logging header which will provide the mock implementation
+#include "../../Software/src/devboard/utils/logging.h"