Bartosz Kosiorek (@gang65) commented about dlls/gdiplus/tests/image.c:
info.hbmColor = hbmColor; hIcon = CreateIconIndirect(&info); ok(hIcon != 0, "CreateIconIndirect failed\n");
DeleteObject(hbmMask);
DeleteObject(hbmColor);
stat = GdipCreateBitmapFromHICON(hIcon, &bitmap);
It would be perfect to verify, what kind of image is produced. Currently we are not checking the content of the image.