=pod

=head1 Name

Test.Harness - Run TAP standard JavaScript test scripts with statistics

=head1 Synopsis

  Test.Harness.runTests('foo.js', bar.js');

=head1 Description

B<STOP!> If all you want to do is write a test script, consider using
Test.Simple. Test.Harness is the module that reads the output from
Test.Simple, Test.More and other modules based on Test.Builder. You don't need
to know about Test.Harness to use those modules.

B<STOP AGAIN!> Test.Harness is an abstract base class. See
L<Test.Harness.Browser> for a concrete subclass offering a browser-based
harness.

Test.Harness runs tests and expects to get the results from the C<TestResults>
attribute of the Test.Builder object.  These results conform to a format
called TAP, the Test Anything Protocol. It is defined in
L<http://search.cpan.org/dist/Test-Harness/lib/Test/Harness/TAP.pod>.

=head2 Failure

When tests fail, analyze the summary report:

  base.html..............ok
  nonumbers.js...........ok
  ok.js..................ok
  test-harness.js........ok
  waterloo.html..........dubious
  DIED. FAILED tests 1, 3, 5, 7, 9, 11, 13, 15, 17, 19
          Failed 10/20 tests, 50.00% okay
  Failed Test   Total Fail  Failed  List of Failed
  -------------------------------------------------------------
  waterloo.html    20   10  50.00%  1 3 5 7 9 11 13 15 17 19
  Failed 1/5 test scripts, 80.00% okay. 10/44 subtests failed, 77.27% okay.

Everything passed but F<waterloo.html>. It failed 10 of 20 tests.

The columns in the summary report mean:

=over 4

=item B<Failed Test>

The test file which failed.

=item B<Total>

Total number of tests expected to run.

=item B<Fail>

Number that failed, either from "not ok" or because they never ran.

=item B<Failed>

Percentage of the total tests that failed.

=item B<List of Failed>

A list of the tests that failed.  Successive failures may be abbreviated
(ie. 15-20 to indicate that tests 15, 16, 17, 18, 19 and 20 failed).

=back

=head2 Class Methods

  Test.Harness.runTests('testone.js', 'testtwo.js');

Constructs a new Test.Harness object and calls its C<runTests()> instance
method, passing all arguments along.

=head2 Constructors

  var harness = new Test.Harness();

Constructs a new Test.Harness object.

=head2 Instance Methods

=over 4

=item B<runTests>

  harness.runTests('testone.js', 'testtwo.js');

This method runs all the given test files and divines whether they passed or
failed based on the contents of the C<TestRusults> attribute of their global
C<Test.Builder.Test> object.  It prints out each individual test that failed
along with a summary report and a how long it all took. When all tests have
been run, a diagnostic message will be output.

=item B<encoding>

  var encoding = harness.encoding();
  harness = harness.encoding(encoding);

Gets or sets the encoding to use for the test scripts. Returns the harness
object when setting the encoding. The encoding is C<null> by default, and
therefore unset.

=back

=head1 Diagnostics

=over 4

=item C<All tests successful.\nFiles=%d,  Tests=%d, %s>

If all tests are successful some statistics about the performance are output.

=item C<FAILED tests %s\n\tFailed %d/%d tests, %.2f%% okay.>

For any single script that has failing subtests statistics like the above are
printed.

=item C<Failed 1 test, %.2f%% okay. %s>

=item C<Failed %d/%d tests, %.2f%% okay. %s>

If not all tests were successful, the script dies with one of the above
messages.

=back

=head1 See Also

L<Test.Simple> and L<Test.More>, modules with which to write tests.

=head1 Authors

David Wheeler <david@kineticode.com>, based on the original Test::Harness
included with Perl.

=head1 Copyright

Copyright 2005 by David Wheeler <david@kineticode.com>

This program is free software; you can redistribute it and/or modify it under
the terms of the Perl Artistic License or the GNU GPL.

See L<http://www.perl.com/perl/misc/Artistic.html> and
L<http://www.gnu.org/copyleft/gpl.html>.

=cut