package Perl::Critic::Policy::TestingAndDebugging::RequireTestLabels;

use 5.006001;
use strict;
use warnings;
use Readonly;

use List::MoreUtils qw(any);
use Perl::Critic::Utils qw{
    :characters :severities :data_conversion :classification :ppi
};
use base 'Perl::Critic::Policy';

our $VERSION = '1.125';

Readonly::Hash my %LABEL_ARG_POS => (
   ok        => 1,
   is        => 2,
   isnt      => 2,
   like      => 2,
   unlike    => 2,
   cmp_ok    => 3,
   is_deeply => 2,
   pass      => 0,
   fail      => 0,
);

#-----------------------------------------------------------------------------

Readonly::Scalar my $DESC => q{Test without a label};
Readonly::Scalar my $EXPL => q{Add a label argument to all Test::More functions};

#-----------------------------------------------------------------------------

sub supported_parameters {
    return (
        {
            name            => 'modules',
            description     => 'The additional modules to require labels for.',
            default_string  => $EMPTY,
            behavior        => 'string list',
            list_always_present_values => [ qw( Test::More ) ],
        },
    );
}

sub default_severity { return $SEVERITY_MEDIUM             }
sub default_themes   { return qw( core maintenance tests ) }
sub applies_to       { return 'PPI::Token::Word'           }

#-----------------------------------------------------------------------------

sub violates {
    my ($self, $elem, $doc) = @_;

    my $arg_index = $LABEL_ARG_POS{$elem};
    return if not defined $arg_index;
    return if not is_function_call($elem);
    return if not $self->_has_test_more($doc);

    # Does the function call have enough arguments?
    my @args = parse_arg_list($elem);
    return if ( @args > $arg_index );

    return $self->violation( $DESC, $EXPL, $elem );
}

#-----------------------------------------------------------------------------

sub _has_test_more {
    my ( $self, $doc ) = @_;

    # TODO: This method gets called every time violates() is invoked,
    # but it only needs to happen once per document.  Perhaps this
    # policy should just apply to PPI::Document, and then do its own
    # search for method calls.  Since Perl::Critic::Document is
    # optimized, this should be pretty fast.

    my $includes = $doc->find('PPI::Statement::Include');
    return if not $includes;
    return any { exists $self->{_modules}->{$_->module()} }
        @{ $includes };
}

1;

#-----------------------------------------------------------------------------

__END__

=pod

=head1 NAME

Perl::Critic::Policy::TestingAndDebugging::RequireTestLabels - Tests should all have labels.


=head1 AFFILIATION

This Policy is part of the core L<Perl::Critic|Perl::Critic>
distribution.


=head1 DESCRIPTION

Most Perl modules with regression tests use L<Test::More|Test::More>
as infrastructure for writing and running those tests.  It has an
easy, procedural syntax for writing comparisons of results to
expectations.

Most of the Test::More functions allow the programmer to add an
optional label that describes what each test is trying to judge.  When
a test goes wrong, these labels are very useful for quickly
determining where the problem originated.

This policy enforces that all Test::More functions have labels where
applicable.  This only applies to code that has a C<use Test::More> or
C<require Test::More> declaration (see below to add more test modules
to the list).


=head1 CONFIGURATION

A list of additional modules to require label parameters be passed to
their methods can be specified with the C<modules> option.  The list
must consist of whitespace-delimited, fully-qualified module names.
For example:

    [TestingAndDebugging::RequireTestLabels]
    modules = My::Test::SubClass  Some::Other::Module

The module list always implicitly includes L<Test::More|Test::More>.


=head1 AUTHOR

Chris Dolan <cdolan@cpan.org>


=head1 COPYRIGHT

Copyright (c) 2006-2011 Chris Dolan.

This program is free software; you can redistribute it and/or modify
it under the same terms as Perl itself.

=cut

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