NAME

       Test::LectroTest::FailureRecorder - Records/plays failures for regression testing

VERSION

       version 0.5001

SYNOPSIS

        use Test::LectroTest::Recorder;

        my $recorder = Test::LectroTest::Recorder->new("storage_file.txt");

        my $recorder->record_failure_for_property(
           "property name",
           $input_hashref_from_counterexample
        );

        my $failures = $recorder->get_failures_for_property("property name");
        for my $input_hashref (@$failures) {
           # do something with hashref
        }

DESCRIPTION

       This module provides a simple means of recording property-check failures so they can be
       reused as regression tests.  You do not need to use this module yourself because the
       higher-level LectroTest modules will use it for you when needed.  (These docs are mainly
       for LectroTest developers.)

       The basic idea is to record a failure as a pair of the form

        [ <property_name>, <input hash from counterexample> ]

       and Dump these pairs into a text file, each record terminated by blank line so that the
       file can be read using paragraph-slurp mode.

       The module provides methods to add such pairs to a recorder file and to retrieve the
       recorded failures by property name.  It uses a cache to avoid repetitive reads.

METHODS

   new(storage-file)
         my $recorder = Test::LectroTest::Recorder->new("/path/to/storage.txt");

       Creates a new recorder object and tells it to use storage-file for the reading and writing
       of failures.

       The recorder will not access the storage file until you attempt to get or record a
       failure.  Thus it is OK to specify a storage file that does not yet exist, provided you
       record failures to it before you attempt to get failures from it.

   get_failures_for_property(propname)
         my $failures = $recorder->get_failures_for_property("property name");
         for my $input_hashref (@$failures) {
            # do something with hashref
            while (my ($var, $value) = each %$input_hashref) {
                # ...
            }
         }

       Returns a reference to an array that contains the recorded failures for the property with
       the name propname.  In the event no such failures exist, the array will be empty.  Each
       failure is represented by a hash containing the inputs that caused the failure.

       If the recorder's storage file does not exist or cannot be opened for reading, this method
       dies.  Thus, you should call it from within an "eval" block.

   record_failure_for_property(propname, input-hashref)
         my $recorder->record_failure_for_property(
            "property name",
            $input_hashref_from_counterexample
         );

       Adds a failure record for the property named propname.  The record captures the
       counterexample represented by the input-hashref.  The record is immediately appended to
       the recorder's storage file.

       Returns 1 upon success; dies otherwise.

       If the recorder's storage file cannot be opened for writing, this method dies.  Thus, you
       should call it from within an "eval" block.

SEE ALSO

       Test::LectroTest::TestRunner explains the internal testing apparatus, which uses the
       failure recorders to record and play back failures for regression testing.

AUTHOR

       Tom Moertel (tom@moertel.com)

COPYRIGHT and LICENSE

       Copyright (c) 2004-13 by Thomas G Moertel.  All rights reserved.

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