##
if(!defined $hash_ref->{$block}->{$libName}) {
print "This is a test\n";
}
####
$VAR1 = {
'block1' => {
'lib1' => {
'cell_1' => 1,
'cell_2' => 1,
},
},
'block2' => {
'lib1' => {
'cell_3' => 1,
'cell_4' => 1,
},
},
'block3' => {},
};