d3dx9/tests: Skip a test if DXTn texture formats are not supported.

dlls/d3dx9_36/tests/texture.c

@@ -341,7 +341,9 @@ static void test_D3DXCheckTextureRequirements(IDirect3DDevice9 *device)
     ok(format == expected, "Returned format %u, expected %u\n", format, expected);
 
     /* Block-based texture formats and size < block size. */
-    format = D3DFMT_DXT1;
+    if (has_2d_dxt5)
+    {
+        format = D3DFMT_DXT5;
         width = 2; height = 2;
         mipmaps = 1;
         hr = D3DXCheckTextureRequirements(device, &width, &height, &mipmaps, 0, &format, D3DPOOL_DEFAULT);
@@ -349,7 +351,12 @@ static void test_D3DXCheckTextureRequirements(IDirect3DDevice9 *device)
         ok(width == 4, "Returned width %d, expected %d\n", width, 4);
         ok(height == 4, "Returned height %d, expected %d\n", height, 4);
         ok(mipmaps == 1, "Returned mipmaps %d, expected %d\n", mipmaps, 1);
-    ok(format == D3DFMT_DXT1, "Returned format %u, expected %u\n", format, D3DFMT_DXT1);
+        ok(format == D3DFMT_DXT5, "Returned format %u, expected %u\n", format, D3DFMT_DXT5);
+    }
+    else
+    {
+        skip("D3DFMT_DXT5 textures are not supported, skipping a test.\n");
+    }
 
     IDirect3D9_Release(d3d);
 }