gdi32: add testcases for copying an EMF from a NULL bitmap

[Austin English]

Testcase for bug 4553

-- 
-Austin
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diff --git a/dlls/gdi32/tests/metafile.c b/dlls/gdi32/tests/metafile.c
index a186608..3d2a2f8 100644
--- a/dlls/gdi32/tests/metafile.c
+++ b/dlls/gdi32/tests/metafile.c
@@ -2618,6 +2618,31 @@ static void test_SetEnhMetaFileBits(void)
     DeleteEnhMetaFile(hemf);
 }
 
+static void test_emf_copy(void)
+{
+    HDC hdc;
+    HDC hemfdc;
+    BOOL r;
+    HENHMETAFILE hemf;
+
+    hdc = GetDC(NULL);
+    ok( hdc != NULL, "create dc failed\n");
+
+    hemfdc = CreateEnhMetaFile( hdc, NULL, NULL, NULL );
+    ok( hemfdc != NULL, "create emf failed\n");
+
+    r = BitBlt( 0, 0, 0, 100, 100, hemfdc, 0, 0, 0xff0062);
+    ok( r == FALSE, "bitblt failed\n");
+
+    r = BitBlt( hemfdc, 0, 0, 100, 100, 0, 0, 0, 0xff0062);
+    ok( r == TRUE, "bitblt failed\n");
+
+    hemf = CloseEnhMetaFile(hemfdc);
+    ok( hemf != NULL, "failed to get ehmmetafile handle\n");
+
+    DeleteObject(hemf);
+}
+
 START_TEST(metafile)
 {
     init_function_pointers();
@@ -2644,4 +2669,5 @@ START_TEST(metafile)
 
     test_gdiis();
     test_SetEnhMetaFileBits();
+    test_emf_copy();
 }