fate: add test for lut filter

Signed-off-by: Paul B Mahol <onemda@gmail.com>

tests/fate/filter-video.mak

@@ -215,6 +215,9 @@ fate-filter-pixfmts-il:    CMD = pixfmts "luma_mode=d:chroma_mode=d:alpha_mode=d
 FATE_FILTER_PIXFMTS-$(CONFIG_KERNDEINT_FILTER) += fate-filter-pixfmts-kerndeint
 fate-filter-pixfmts-kerndeint: CMD = pixfmts "" "tinterlace=interleave_top,"
 
+FATE_FILTER_PIXFMTS-$(CONFIG_LUT_FILTER) += fate-filter-pixfmts-lut
+fate-filter-pixfmts-lut: CMD = pixfmts "c0=2*val:c1=2*val:c2=val/2:c3=negval+40"
+
 FATE_FILTER_PIXFMTS-$(CONFIG_NULL_FILTER) += fate-filter-pixfmts-null
 fate-filter-pixfmts-null:  CMD = pixfmts
 

tests/ref/fate/filter-pixfmts-lut

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