read_verilog << EOT
module top(input a, b, output o);
    wire c, d, e;
    bb bb1 (.a (a), .b (b), .o (c));
    sub_mod sub_inst (.a (a), .b (b), .o (e));
    some_mod some_inst (.a (c), .b (d), .c (e), .o (o));
endmodule

(* blackbox *)
module bb #( parameter SOME_PARAM=0 ) (input a, b, output o);
endmodule

module sub_mod(input a, b, output o);
    bb bb2 (.a (a), .b (b), .o (o));
endmodule

module some_mod(input a, b, c, output o);
assign o = a & (b | c);
endmodule
EOT

hierarchy -top top
design -stash hier

# removing cell
design -load hier
logger -expect log "Removing cell .*, making all cell outputs cutpoints" 1
cutpoint sub_mod/bb2
logger -check-expected
logger -werror "Removing cell .*, making all cell outputs cutpoints"

# removing wires
design -load hier
logger -expect log "Making wire .* a cutpoint" 1
cutpoint top/c
logger -check-expected
logger -werror "Making wire .* a cutpoint"

# removing output wires
design -load hier
logger -expect log "Making output wire .* a cutpoint" 1
cutpoint sub_mod/o
logger -check-expected
logger -werror "Making output wire .* a cutpoint"

# whole module optimization, doesn't do any of the previous
design -load hier
logger -expect log "Making all outputs of module .* cut points, removing module contents" 1
cutpoint sub_mod
logger -check-expected