/usr/lib/tcltk/vtk-6.3/vtktesting/vtktesting.tcl is in tcl-vtk6 6.3.0+dfsg1-5.
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 | package require -exact vtkcommoncore 6.3
foreach s {colors mccases backdrop grab} {
source [file join [file dirname [info script]] "${s}.tcl"]
}
package provide vtktesting 6.3
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