OCCT

if { [isdraw result] } {
    #check if result is valid
    set ch [checkshape result]
    puts $ch

    if { [string compare $ch "This shape seems to be valid"] == 0 } {
        #check if tolerance is less 1.
        set tol 10.
        if { [regexp {Face +:.+Max +([-0-9.+eE]+)} [maxtolerance result] full tol]  == 0 } {
            #Avoiding maxtolerance bug on Windows
            if { [array get Draw_Groups "Shape Healing"] == "" } {
                pload XSDRAW
            }
            regexp {Tolerance +MAX=([-0-9.+eE]+)} [tolerance result] full tol
        }
        if { $tol > 1. } {
            puts "Error: The tolerance of the resulting shape is too big ($tol)."
        }
    }

    checkview -display result -2d -path ${imagedir}/${test_image}.png
} else {
    puts "Error : The skin cannot be built."
}

# to end a test script
puts "TEST COMPLETED"