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use strict;
use Test::More tests => 29;
use Iterator::Util;
# Check that ihead works as promised.
sub begins_with
{
my ($actual, $expected, $test_name) = @_;
$actual = substr($actual, 0, length $expected);
@_ = ($actual, $expected, $test_name);
goto &is;
}
my ($iter, $x, $next, @vals);
# ihead (3)
eval
{
$iter = ihead 5, imap { $_ * $_ } irange 4;
};
$x = $@;
is $x, q{}, q{Created ihead iterator, no errors};
@vals = ();
eval
{
push @vals, $iter->value while $iter->isnt_exhausted;
};
is $x, q{}, q{Executed ihead iterator, no errors};
is_deeply (\@vals, [16, 25, 36, 49, 64], q{ihead returned expected values});
# ihead, zero (3)
eval
{
$iter = ihead 0, imap { $_ * $_ } irange 4;
};
$x = $@;
is $x, q{}, q{Created ihead iterator, no errors};
@vals = ();
eval
{
push @vals, $iter->value while $iter->isnt_exhausted;
};
is $x, q{}, q{Executed ihead iterator, no errors};
is_deeply (\@vals, [], q{ihead returned expected values});
# ihead, negative (3)
eval
{
$iter = ihead -77, imap { $_ * $_ } irange 4;
};
$x = $@;
is $x, q{}, q{Created ihead iterator, no errors};
@vals = ();
eval
{
push @vals, $iter->value while $iter->isnt_exhausted;
};
is $x, q{}, q{Executed ihead iterator, no errors};
is_deeply (\@vals, [], q{ihead returned expected values});
# ihead, parameter error (4)
eval
{
$iter = ihead -77, 4;
};
$x = $@;
isnt $x, q{}, q{Created ihead iterator, no errors};
ok (Iterator::X->caught(), q{ihead exception: proper base class});
ok (Iterator::X::Parameter_Error->caught(), q{ihead exception: proper specific class});
begins_with ($x, q{Second parameter for ihead must be an Iterator},
q{ihead exception formatted properly.});
# ihead (3)
eval
{
$iter = imap { $_ * $_ } irange 4;
@vals = ihead 5, $iter;
$next = $iter->value;
};
is $@, q{}, q{Called ihead, no errors};
is_deeply (\@vals, [16, 25, 36, 49, 64], q{ihead returned expected values});
cmp_ok ($next, '==', 81, q{Iterator advanced correctly});
# ihead, zero (3)
eval
{
$iter = imap { $_ * $_ } irange 4;
@vals = ihead 0, $iter;
$next = $iter->value;
};
is $@, q{}, q{Created ihead iterator, no errors};
is_deeply (\@vals, [], q{ihead returned expected values});
cmp_ok ($next, '==', 16, q{Iterator advanced correctly});
# ihead, negative (3)
eval
{
$iter = imap { $_ * $_ } irange 4;
@vals = ihead -64, $iter;
$next = $iter->value;
};
is $@, q{}, q{Created ihead iterator, no errors};
is_deeply (\@vals, [], q{ihead returned expected values});
cmp_ok ($next, '==', 16, q{Iterator advanced correctly});
# ihead, undef (3)
eval
{
$iter = imap { $_ * $_ } irange 4, 6;
@vals = ihead undef, $iter;
};
is $@, q{}, q{Created ihead iterator, no errors};
is_deeply (\@vals, [16, 25, 36], q{ihead returned expected values});
ok ($iter->is_exhausted, q{ihead exhausted the iterator});
# ihead, parameter error (4)
eval
{
$iter = ihead -77, 4;
};
$x = $@;
isnt $x, q{}, q{Created ihead iterator, no errors};
ok (Iterator::X->caught(), q{ihead exception: proper base class});
ok (Iterator::X::Parameter_Error->caught(), q{ihead exception: proper specific class});
begins_with ($x, q{Second parameter for ihead must be an Iterator},
q{ihead exception formatted properly.});
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