NAME

       HTML::FormHandler::Manual::Testing - testing forms

VERSION

       version 0.40068

SYNOPSIS

       Manual Index

       One of the big advantages of FormHandler compared to many other form packages is that you
       can test the same form that you use in your controller.

DESCRIPTION

       It's difficult to test forms that are instantiated in controllers with 'add_element' calls
       and from YAML, and that have no form class. It's one of the reasons that 'dynamic' forms
       generated with a field_list aren't a good idea for anything except the simplest forms. If
       you have a form class that contains everything that is needed for processing the form,
       it's really really easy to create tests for forms. Look in the FormHandler 't' directory.
       It's full of tests for forms.

       You can test that the validations work, that the database is getting updated correctly,
       even that the HTML that's being rendered is correct. If something isn't working correctly,
       it's ten times easier to debug in a test case than sitting in a controller somewhere. And
       when you finally start up your application and use the form, there should be very few
       surprises.

       FormHandler provides a simple function to test whether the HTML output is correct,
       'is_html' in HTML::FormHandler::Test, which uses HTML::TreeBuilder.  If you need to build
       forms that use the rendering code to produce particular output, it can be helpful.

Example

       Here's an example of a test, originally copied from one of the DBIC model tests.  But you
       should download the tar.gz or checkout the distribution from github and browse through the
       tests.

          use Test::More;
          use lib 't/lib';

          use_ok( 'BookDB::Form::Book');
          use_ok( 'BookDB::Schema::DB');

          my $schema = BookDB::Schema::DB->connect('dbi:SQLite:t/db/book.db');
          ok($schema, 'get db schema');

          my $form = BookDB::Form::Book->new(schema => $schema);

          # This is munging up the equivalent of param data from a form
          my $good = {
              'title' => 'How to Test Perl Form Processors',
              'author' => 'I.M. Author',
              'genres' => [2, 4],
              'format'       => 2,
              'isbn'   => '123-02345-0502-2' ,
              'publisher' => 'EreWhon Publishing',
          };
          ok( $form->process( params => $good ), 'Good data' );

          my $book = $form->item;
          END { $book->delete };
          ok ($book, 'get book object from form');
          my $num_genres = $book->genres->count;
          is( $num_genres, 2, 'multiple select list updated ok');
          is( $form->field('format')->value, 2, 'get value for format' );

          my $bad_1 = {
              notitle => 'not req',
              silly_field   => 4,
          };
          ok( !$form->process( $bad_1 ), 'bad 1' );

          my $bad_2 = {
              'title' => "Another Silly Test Book",
              'author' => "C. Foolish",
              'year' => '1590',
              'pages' => 'too few',
              'format' => '22',
          };
          ok( !$form->process( $bad_2 ), 'bad 2');
          ok( $form->field('year')->has_errors, 'year has error' );
          ok( $form->field('pages')->has_errors, 'pages has error' );
          ok( !$form->field('author')->has_errors, 'author has no error' );
          ok( $form->field('format')->has_errors, 'format has error' );

          my $good = {
             title => "Another Silly Test Book",
             author => "C. Foolish",
             year => 1999,
             pages => 101,
             format => 2
          };
          ok( $form->process($good), 'now form validates' );

          done_testing;

AUTHOR

       FormHandler Contributors - see HTML::FormHandler

COPYRIGHT AND LICENSE

       This software is copyright (c) 2017 by Gerda Shank.

       This is free software; you can redistribute it and/or modify it under the same terms as
       the Perl 5 programming language system itself.