Add a test for IDirectDrawSurface_SetColorKey

[Günther Brammer]

Only tested with wine, unfortunately. Tests for the issue causing Bug 5730.

diff --git a/dlls/ddraw/tests/dsurface.c b/dlls/ddraw/tests/dsurface.c
index 3d70f82..74e4f28 100644
--- a/dlls/ddraw/tests/dsurface.c
+++ b/dlls/ddraw/tests/dsurface.c
@@ -167,6 +167,7 @@ static void SrcColorKey32BlitTest(void)
     LPDIRECTDRAWSURFACE lpDst;
     DDSURFACEDESC ddsd;
     DDSURFACEDESC ddsd2;
+    DDCOLORKEY DDColorKey;
     LPDWORD lpData;
     HRESULT rc;
 
@@ -222,6 +223,21 @@ static void SrcColorKey32BlitTest(void)
        "Destination data after blitting is not correct\n");
     rc = IDirectDrawSurface_Unlock(lpDst, NULL);
     ok(rc==DD_OK,"Unlock returned: %x\n",rc);
+    
+    /* Also test SetColorKey */
+	IDirectDrawSurface_GetColorKey(lpSrc, DDCKEY_SRCBLT, &DDColorKey);
+	ok(DDColorKey.dwColorSpaceLowValue == 0xFF00FF && DDColorKey.dwColorSpaceHighValue == 0xFF00FF,
+	   "GetColorKey does not return the colorkey used at surface creation\n");
+	
+	DDColorKey.dwColorSpaceLowValue = 0x00FF00;
+	DDColorKey.dwColorSpaceHighValue = 0x00FF00;
+	IDirectDrawSurface_SetColorKey(lpSrc, DDCKEY_SRCBLT, &DDColorKey);
+	
+	DDColorKey.dwColorSpaceLowValue = 0;
+	DDColorKey.dwColorSpaceHighValue = 0;
+	IDirectDrawSurface_GetColorKey(lpSrc, DDCKEY_SRCBLT, &DDColorKey);
+	ok(DDColorKey.dwColorSpaceLowValue == 0x00FF00 && DDColorKey.dwColorSpaceHighValue == 0x00FF00,
+	   "GetColorKey does not return the colorkey set with SetColorKey\n");
 
     IDirectDrawSurface_Release(lpSrc);
     IDirectDrawSurface_Release(lpDst);