diff --git a/rostests/dxtest/ddraw/debug.cpp b/rostests/dxtest/ddraw/debug.cpp
index 423cd91c9f3..8744547ca50 100644
--- a/rostests/dxtest/ddraw/debug.cpp
+++ b/rostests/dxtest/ddraw/debug.cpp
@@ -5,7 +5,7 @@ PCHAR DDErrorString (HRESULT hResult)
 {
 	switch (hResult)
 	{
-		case DD_OK:								 return "DD_OK";
+		case DD_OK:                              return "DD_OK";
 		case DDERR_ALREADYINITIALIZED:           return "DDERR_ALREADYINITIALIZED";
 		case DDERR_CANNOTATTACHSURFACE:          return "DDERR_CANNOTATTACHSURFACE";
 		case DDERR_CANNOTDETACHSURFACE:          return "DDERR_CANNOTDETACHSURFACE";
diff --git a/rostests/dxtest/ddraw/testlist.cpp b/rostests/dxtest/ddraw/testlist.cpp
index e20d74e8ee4..daffef6d90c 100644
--- a/rostests/dxtest/ddraw/testlist.cpp
+++ b/rostests/dxtest/ddraw/testlist.cpp
@@ -15,7 +15,8 @@ TEST TestList[] =
 	{ "DirectDrawCreate(Ex)", Test_CreateDDraw },
 	{ "IDirectDraw::SetCooperativeLevel", Test_SetCooperativeLevel },
 	// { "IDirectDraw::EnumDisplayModes/SetDisplayMode", Test_DisplayModes }, // uncomment this test if you have enough time and patience
-	{ "IDirectDraw::CreateSurface", Test_CreateSurface }
+	{ "IDirectDraw::CreateSurface", Test_CreateSurface },
+	{ "IDirectDraw::GetMonitorFrequency", Test_GetMonitorFrequency },
 };
 
 /* The function that gives us the number of tests */
diff --git a/rostests/dxtest/ddraw/tests/CreateDDraw.cpp b/rostests/dxtest/ddraw/tests/CreateDDraw.cpp
index cc17c3c0a1c..84ed4c1169d 100644
--- a/rostests/dxtest/ddraw/tests/CreateDDraw.cpp
+++ b/rostests/dxtest/ddraw/tests/CreateDDraw.cpp
@@ -4,8 +4,8 @@ HWND CreateBasicWindow (VOID);
 
 BOOL Test_CreateDDraw (INT* passed, INT* failed)
 {
-	LPDIRECTDRAW7 DirectDraw;
-	IDirectDraw* DirectDraw2;
+	LPDIRECTDRAW7 DirectDraw = NULL;
+	IDirectDraw* DirectDraw2 = NULL;
 
 	/*** FIXME: Test first parameter using EnumDisplayDrivers  ***/
 
@@ -13,16 +13,19 @@ BOOL Test_CreateDDraw (INT* passed, INT* failed)
 	TEST (DirectDrawCreateEx(NULL, (VOID**)&DirectDraw, IID_IDirectDraw4, NULL) == DDERR_INVALIDPARAMS);
 	TEST (DirectDrawCreateEx(NULL, NULL, IID_IDirectDraw7, NULL) == DDERR_INVALIDPARAMS); 
 	TEST (DirectDrawCreateEx(NULL, (VOID**)&DirectDraw, IID_IDirectDraw7, NULL) == DD_OK);
+	TEST (DirectDraw && DirectDraw->Release());
 	TEST (DirectDrawCreate(NULL ,&DirectDraw2, NULL) == DD_OK);
+	TEST (DirectDraw2 && DirectDraw2->Release());
+
 
 	return TRUE;
 }
 
 BOOL Test_SetCooperativeLevel (INT* passed, INT* failed)
 {
-	HWND hwnd; 
+	HWND hwnd;
 	LPDIRECTDRAW7 DirectDraw;
-	
+
 	/* Preparations */
 	if (DirectDrawCreateEx(NULL, (VOID**)&DirectDraw, IID_IDirectDraw7, NULL) != DD_OK)
 	{
@@ -36,9 +39,10 @@ BOOL Test_SetCooperativeLevel (INT* passed, INT* failed)
 		DirectDraw->Release();
 		return FALSE;
 	}
-	
+
 	/* The Test */
 	TEST ( DirectDraw->SetCooperativeLevel (NULL, DDSCL_FULLSCREEN) == DDERR_INVALIDPARAMS );
+	TEST ( DirectDraw->SetCooperativeLevel (hwnd, DDSCL_FULLSCREEN) == DDERR_INVALIDPARAMS );
 	TEST ( DirectDraw->SetCooperativeLevel (NULL, DDSCL_FULLSCREEN | DDSCL_EXCLUSIVE) == DDERR_INVALIDPARAMS );
 	TEST ( DirectDraw->SetCooperativeLevel (hwnd, DDSCL_FULLSCREEN) == DDERR_INVALIDPARAMS);
 	TEST ( DirectDraw->SetCooperativeLevel (hwnd, DDSCL_NORMAL | DDSCL_ALLOWMODEX) == DDERR_INVALIDPARAMS );
@@ -54,27 +58,27 @@ BOOL Test_SetCooperativeLevel (INT* passed, INT* failed)
 	return TRUE;
 }
 
-LONG WINAPI BasicWindowProc (HWND hwnd, UINT message, UINT wParam, LONG lParam) 
-{ 
+LONG WINAPI BasicWindowProc (HWND hwnd, UINT message, UINT wParam, LONG lParam)
+{
 	switch (message)
 	{
 		case WM_DESTROY:
 		{
-			PostQuitMessage (0); 
+			PostQuitMessage (0);
 			return 0;
 		} break;
 	}
 
 	return DefWindowProc (hwnd, message, wParam, lParam);
-} 
+}
 
 HWND CreateBasicWindow (VOID)
 {
 	WNDCLASS wndclass = {0};
 	wndclass.lpfnWndProc   = BasicWindowProc;
 	wndclass.hInstance     = GetModuleHandle(NULL);
-	wndclass.lpszClassName = "DDrawTest"; 
-	RegisterClass(&wndclass);    
+	wndclass.lpszClassName = "DDrawTest";
+	RegisterClass(&wndclass);
 
 	return CreateWindow("DDrawTest", "ReactOS DirectDraw Test", WS_POPUP, 0, 0, 10, 10, NULL, NULL, GetModuleHandle(NULL), NULL);
 }
diff --git a/rostests/dxtest/ddraw/tests/CreateSurface.cpp b/rostests/dxtest/ddraw/tests/CreateSurface.cpp
index 33edbbc8f90..dbcf5a1f1d1 100644
--- a/rostests/dxtest/ddraw/tests/CreateSurface.cpp
+++ b/rostests/dxtest/ddraw/tests/CreateSurface.cpp
@@ -4,7 +4,7 @@ HWND CreateBasicWindow (VOID);
 BOOL Test_CreateSurface (INT* passed, INT* failed)
 {
 	LPDIRECTDRAW7 DirectDraw;
-	LPDIRECTDRAWSURFACE7 DirectDrawSurface;
+	LPDIRECTDRAWSURFACE7 DirectDrawSurface = NULL;
 	HWND hwnd;
 
 	/* Preparations */
@@ -40,7 +40,17 @@ BOOL Test_CreateSurface (INT* passed, INT* failed)
 	Desc.dwSize = sizeof (DDSURFACEDESC2);
 	TEST ( DirectDraw->CreateSurface(&Desc, &DirectDrawSurface, NULL) == DDERR_INVALIDPARAMS );
 
+	Desc.dwFlags = DDSD_CAPS;
+	Desc.ddsCaps.dwCaps = DDSCAPS_PRIMARYSURFACE;
+	TEST ( DirectDraw->CreateSurface(&Desc, &DirectDrawSurface, NULL) == DD_OK );
+	TEST ( DirectDrawSurface && DirectDrawSurface->Release() == DD_OK );
+
+	DirectDrawSurface = NULL;
+	Desc.ddsCaps.dwCaps = DDSCAPS_BACKBUFFER;
+	TEST ( DirectDraw->CreateSurface(&Desc, &DirectDrawSurface, NULL) == DD_OK );
+	TEST ( DirectDrawSurface && DirectDrawSurface->Release() == DD_OK );
+
 	DirectDraw->Release();
 
 	return TRUE;
-}
\ No newline at end of file
+}
diff --git a/rostests/dxtest/ddraw/tests/DisplayModes.cpp b/rostests/dxtest/ddraw/tests/DisplayModes.cpp
index 7dd951439ce..b007655dcd8 100644
--- a/rostests/dxtest/ddraw/tests/DisplayModes.cpp
+++ b/rostests/dxtest/ddraw/tests/DisplayModes.cpp
@@ -22,7 +22,7 @@ BOOL Test_DisplayModes (INT* passed, INT* failed)
 {
 	/*** FIXME: Also test with surface as parameter; try busy/locked surface as well ***/
 	LPDIRECTDRAW7 DirectDraw;
-	
+
 	/* Preparations */
 	if (DirectDrawCreateEx(NULL, (VOID**)&DirectDraw, IID_IDirectDraw7, NULL) != DD_OK)
 	{
@@ -34,12 +34,12 @@ BOOL Test_DisplayModes (INT* passed, INT* failed)
 
 	/* The Test */
 
-	// First try with some generic display modes 
+	// First try with some generic display modes
 	TEST ( DirectDraw->SetDisplayMode (1586, 895, 0, 0, 0) == DDERR_UNSUPPORTED );
 	TEST ( DirectDraw->SetDisplayMode (0, 0, 0, 0, 0x123) == DDERR_INVALIDPARAMS );
 
 	TEST ( DirectDraw->SetDisplayMode (0, 0, 0, 0, 0) == DD_OK );
-	TEST ( DirectDraw->SetDisplayMode (800, 600, 0, 0, 0) == DD_OK ); 
+	TEST ( DirectDraw->SetDisplayMode (800, 600, 0, 0, 0) == DD_OK );
 	TEST ( DirectDraw->SetDisplayMode (0, 0, 16, 0, 0) == DD_OK );
 
 	// does this change the display mode to DDSCL_EXCLUSIVE ?
@@ -55,3 +55,31 @@ BOOL Test_DisplayModes (INT* passed, INT* failed)
 
 	return TRUE;
 }
+
+BOOL Test_GetMonitorFrequency (INT* passed, INT* failed)
+{
+	HWND hwnd;
+	DWORD lpdwFrequency; 
+	LPDIRECTDRAW7 DirectDraw;
+
+	/* Preparations */
+	if (DirectDrawCreateEx(NULL, (VOID**)&DirectDraw, IID_IDirectDraw7, NULL) != DD_OK)
+	{
+		printf("ERROR: Failed to set up ddraw\n");
+		return FALSE;
+	}
+
+	if(!( hwnd = CreateBasicWindow() ))
+	{
+		printf("ERROR: Failed to create window\n");
+		DirectDraw->Release();
+		return FALSE;
+	}
+
+	/* The Test */
+	TEST ( DirectDraw->GetMonitorFrequency (NULL) == DDERR_INVALIDPARAMS );
+	TEST ( DirectDraw->GetMonitorFrequency (&lpdwFrequency) == DD_OK );
+	TEST ( lpdwFrequency != 0 );
+
+	return TRUE;
+}