name => 'op:isnt (bool, false)',
expr => "[bool1 isnt false]",
nodes => [$m{root}],
result => [@m{qw/d1/}],
);
test_csel(
name => 'op:isnt (bool, true)'
> "[bool1 isnt true]",
nodes => [$m{root}],
result => [@m{qw/root d2 d3 d4/}],
);
test_csel(
name => 'op:isnt (defined)',
expr => "[defined1 isnt null]",