diff --git a/CMakeLists.txt b/CMakeLists.txt
index 924bd4f..3354293 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -113,6 +113,10 @@ add_executable(unit_tests EXCLUDE_FROM_ALL
         sources/APU/DSP/Envelope.cpp
         sources/APU/DSP/Timer.cpp
         sources/APU/DSP/BRR.cpp
+		sources/PPU/PPUUtils.cpp
+		sources/PPU/Tile.hpp
+		sources/PPU/TileRenderer.cpp
+		sources/PPU/TileRenderer.hpp
         )
 
 # include criterion & coverage
diff --git a/sources/PPU/PPU.cpp b/sources/PPU/PPU.cpp
index 3557ed1..16872dd 100644
--- a/sources/PPU/PPU.cpp
+++ b/sources/PPU/PPU.cpp
@@ -205,7 +205,7 @@ namespace ComSquare::PPU
 
 	uint8_t PPU::read(uint24_t addr)
 	{
-		return 0;
+		//return 0;
 		switch (addr) {
 		case PpuRegisters::mpyl:
 			return  this->_registers._mpy.mpyl;
@@ -250,7 +250,7 @@ namespace ComSquare::PPU
 
 	void PPU::write(uint24_t addr, uint8_t data)
 	{
-		return;
+		//return;
 		switch (addr) {
 		case PpuRegisters::inidisp:
 			this->_registers._inidisp.raw = data;
diff --git a/sources/SNES.cpp b/sources/SNES.cpp
index e52d9fa..51c8bd6 100644
--- a/sources/SNES.cpp
+++ b/sources/SNES.cpp
@@ -196,6 +196,6 @@ namespace ComSquare
 					this->_tileViewer->focus();
 				else
 					this->_tileViewer = std::make_unique<Debugger::TileViewer>(*this, *this->ppu);
-			}
 		#endif
+	}
 }