/usr/lib/R/site-library/rtracklayer/tests/step.wig is in r-bioc-rtracklayer 1.38.0-1build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 | track type=wiggle_0 name="test" description="test track" visibility=full autoScale=off viewLimits=0:1000 color=0,200,100 maxHeightPixels=100:50:20 graphType=points priority=30
variableStep chrom=chr19
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59104901 12.5
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59105601 17.5
59105901 20.0
59106081 17.5
59106301 15.0
59106691 12.5
59107871 10.0
fixedStep chrom=chr18 start=59108021 step=300 span=200
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