For those kind of tests with "binary" data, we usually just put the data into an array in the test .c file, prefixed by the source between #if 0 / #endif. See d3dx9_36/tests/effect.c or d3d11/tests/d3d11.c for examples.
And for yet one more nitpick: I prefer the "d3dx10:" prefix in the patch subject, without the version part, when the patch doesn't affect only one specific version.