CONTENTS

• NAME
• VERSION
• DESCRIPTION
• SYNOPSIS
• METHODS
  • Class Methods
    • new
  • Instance Methods
    • runtests
    • summary
    • aggregate_tests
    • make_scheduler
    • jobs
    • make_parser
    • finish_parser
• CONFIGURING
  • Plugins
  • Module::Build
  • ExtUtils::MakeMaker
  • prove
• WRITING PLUGINS
• SUBCLASSING
  • Methods
• REPLACING
• SEE ALSO

#NAME

TAP::Harness - Run test scripts with statistics

#VERSION

Version 3.26

#DESCRIPTION

This is a simple test harness which allows tests to be run and results automatically aggregated and output to STDOUT.

#SYNOPSIS

use TAP::Harness;my $harness = TAP::Harness->new( \%args );$harness->runtests(@tests);

#METHODS

#Class Methods

#new

my %args = (   verbosity => 1,   lib     => [ 'lib', 'blib/lib', 'blib/arch' ],)my $harness = TAP::Harness->new( \%args );

The constructor returns a newTAP::Harness object. It accepts an optional hashref whose allowed keys are:

• verbosity

  Set the verbosity level:

   1   verbose        Print individual test results to STDOUT. 0   normal-1   quiet          Suppress some test output (mostly failures                     while tests are running).-2   really quiet   Suppress everything but the tests summary.-3   silent         Suppress everything.

• timer

  Append run time for each test to output. UsesTime::HiRes if available.

• failures

  Show test failures (this is a no-op ifverbose is selected).

• comments

  Show test comments (this is a no-op ifverbose is selected).

• show_count

  Update the running test count during testing.

• normalize

  Set to a true value to normalize the TAP that is emitted in verbose modes.

• lib

  Accepts a scalar value or array ref of scalar values indicating which paths to allowed libraries should be included if Perl tests are executed. Naturally, this only makes sense in the context of tests written in Perl.

• switches

  Accepts a scalar value or array ref of scalar values indicating which switches should be included if Perl tests are executed. Naturally, this only makes sense in the context of tests written in Perl.

• test_args

  A reference to an@INC style array of arguments to be passed to each test program.

  test_args => ['foo', 'bar'],

  if you want to pass different arguments to each test then you should pass a hash of arrays, keyed by the alias for each test:

  test_args => {  my_test    => ['foo', 'bar'],  other_test => ['baz'],}

• color

  Attempt to produce color output.

• exec

  Typically, Perl tests are run through this. However, anything which spits out TAP is fine. You can use this argument to specify the name of the program (and optional switches) to run your tests with:

  exec => ['/usr/bin/ruby', '-w']

  You can also pass a subroutine reference in order to determine and return the proper program to run based on a given test script. The subroutine reference should expect the TAP::Harness object itself as the first argument, and the file name as the second argument. It should return an array reference containing the command to be run and including the test file name. It can also simply returnundef, in which case TAP::Harness will fall back on executing the test script in Perl:

  exec => sub {    my ( $harness, $test_file ) = @_;    # Let Perl tests run.    return undef if $test_file =~ /[.]t$/;    return [ qw( /usr/bin/ruby -w ), $test_file ]      if $test_file =~ /[.]rb$/;  }

  If the subroutine returns a scalar with a newline or a filehandle, it will be interpreted as raw TAP or as a TAP stream, respectively.

• merge

  Ifmerge is true the harness will create parsers that merge STDOUT and STDERR together for any processes they start.

• sources

  NEW to 3.18.

  If set,sources must be a hashref containing the names of theTAP::Parser::SourceHandlers to load and/or configure. The values are a hash of configuration that will be accessible to to the source handlers via"config_for" in TAP::Parser::Source.

  For example:

  sources => {  Perl => { exec => '/path/to/custom/perl' },  File => { extensions => [ '.tap', '.txt' ] },  MyCustom => { some => 'config' },}

  Thesources parameter affects howsource,tap andexec parameters are handled.

  For more details, see thesources parameter in"new" in TAP::Parser,TAP::Parser::Source, andTAP::Parser::IteratorFactory.

• aggregator_class

  The name of the class to use to aggregate test results. The default isTAP::Parser::Aggregator.

• version

  NEW to 3.22.

  Assume this TAP version forTAP::Parser instead of default TAP version 12.

• formatter_class

  The name of the class to use to format output. The default isTAP::Formatter::Console, orTAP::Formatter::File if the output isn't a TTY.

• multiplexer_class

  The name of the class to use to multiplex tests during parallel testing. The default isTAP::Parser::Multiplexer.

• parser_class

  The name of the class to use to parse TAP. The default isTAP::Parser.

• scheduler_class

  The name of the class to use to schedule test execution. The default isTAP::Parser::Scheduler.

• formatter

  If setformatter must be an object that is capable of formatting the TAP output. SeeTAP::Formatter::Console for an example.

• errors

  If parse errors are found in the TAP output, a note of this will be made in the summary report. To see all of the parse errors, set this argument to true:

  errors => 1

• directives

  If set to a true value, only test results with directives will be displayed. This overrides other settings such asverbose orfailures.

• ignore_exit

  If set to a true value instructTAP::Parser to ignore exit and wait status from test scripts.

• jobs

  The maximum number of parallel tests to run at any time. Which tests can be run in parallel is controlled byrules. The default is to run only one test at a time.

• rules

  A reference to a hash of rules that control which tests may be executed in parallel. This is an experimental feature and the interface may change.

  $harness->rules(    {   par => [            { seq => '../ext/DB_File/t/*' },            { seq => '../ext/IO_Compress_Zlib/t/*' },            { seq => '../lib/CPANPLUS/*' },            { seq => '../lib/ExtUtils/t/*' },            '*'        ]    });

• stdout

  A filehandle for catching standard output.

• trap

  Attempt to print summary information if run is interrupted by SIGINT (Ctrl-C).

Any keys for which the value isundef will be ignored.

#Instance Methods

#runtests

$harness->runtests(@tests);

Accepts an array of@tests to be run. This should generally be the names of test files, but this is not required. Each element in@tests will be passed toTAP::Parser::new() as asource. SeeTAP::Parser for more information.

It is possible to provide aliases that will be displayed in place of the test name by supplying the test as a reference to an array containing[ $test, $alias ]:

$harness->runtests( [ 't/foo.t', 'Foo Once' ],                    [ 't/foo.t', 'Foo Twice' ] );

Normally it is an error to attempt to run the same test twice. Aliases allow you to overcome this limitation by giving each run of the test a unique name.

Tests will be run in the order found.

If the environment variablePERL_TEST_HARNESS_DUMP_TAP is defined it should name a directory into which a copy of the raw TAP for each test will be written. TAP is written to files named for each test. Subdirectories will be created as needed.

Returns aTAP::Parser::Aggregator containing the test results.

#summary

$harness->summary( $aggregator );

Output the summary for aTAP::Parser::Aggregator.

#aggregate_tests

$harness->aggregate_tests( $aggregate, @tests );

Run the named tests and display a summary of result. Tests will be run in the order found.

Test results will be added to the suppliedTAP::Parser::Aggregator.aggregate_tests may be called multiple times to run several sets of tests. MultipleTest::Harness instances may be used to pass results to a single aggregator so that different parts of a complex test suite may be run using differentTAP::Harness settings. This is useful, for example, in the case where some tests should run in parallel but others are unsuitable for parallel execution.

my $formatter   = TAP::Formatter::Console->new;my $ser_harness = TAP::Harness->new( { formatter => $formatter } );my $par_harness = TAP::Harness->new(    {   formatter => $formatter,        jobs      => 9    });my $aggregator = TAP::Parser::Aggregator->new;$aggregator->start();$ser_harness->aggregate_tests( $aggregator, @ser_tests );$par_harness->aggregate_tests( $aggregator, @par_tests );$aggregator->stop();$formatter->summary($aggregator);

Note that for simpler testing requirements it will often be possible to replace the above code with a single call toruntests.

Each element of the@tests array is either:

• the source name of a test to run

• a reference to a [ source name, display name ] array

In the case of a perl test suite, typicallysource names are simply the file names of the test scripts to run.

When you supply a separate display name it becomes possible to run a test more than once; the display name is effectively the alias by which the test is known inside the harness. The harness doesn't care if it runs the same test more than once when each invocation uses a different name.

#make_scheduler

Called by the harness when it needs to create aTAP::Parser::Scheduler. Override in a subclass to provide an alternative scheduler.make_scheduler is passed the list of tests that was passed toaggregate_tests.

#jobs

Gets or sets the number of concurrent test runs the harness is handling. By default, this value is 1 -- for parallel testing, this should be set higher.

#make_parser

Make a new parser and display formatter session. Typically used and/or overridden in subclasses.

my ( $parser, $session ) = $harness->make_parser;

#finish_parser

Terminate use of a parser. Typically used and/or overridden in subclasses. The parser isn't destroyed as a result of this.

#CONFIGURING

TAP::Harness is designed to be easy to configure.

#Plugins

TAP::Parser plugins let you change the way TAP isinput to andoutput from the parser.

TAP::Parser::SourceHandlers handle TAPinput. You can configure them and load custom handlers using thesources parameter to"new".

TAP::Formatters handle TAPoutput. You can load custom formatters by using theformatter_class parameter to"new". To configure a formatter, you currently need to instantiate it outside ofTAP::Harness and pass it in with theformatter parameter to"new". Thismay be addressed by adding aformatters parameter to"new" in the future.

#Module::Build

Module::Build version0.30 supportsTAP::Harness.

To loadTAP::Harness plugins, you'll need to use thetap_harness_args parameter tonew, typically from yourBuild.PL. For example:

Module::Build->new(    module_name        => 'MyApp',    test_file_exts     => [qw(.t .tap .txt)],    use_tap_harness    => 1,    tap_harness_args   => {        sources => {            MyCustom => {},            File => {                extensions => ['.tap', '.txt'],            },        },        formatter_class => 'TAP::Formatter::HTML',    },    build_requires     => {        'Module::Build' => '0.30',        'TAP::Harness'  => '3.18',    },)->create_build_script;

See"new"

#ExtUtils::MakeMaker

ExtUtils::MakeMaker does not supportTAP::Harness out-of-the-box.

#prove

prove supportsTAP::Harness plugins, and has a plugin system of its own. See"FORMATTERS" in prove,"SOURCE HANDLERS" in prove andApp::Prove for more details.

#WRITING PLUGINS

If you can't configureTAP::Harness to do what you want, and you can't find an existing plugin, consider writing one.

The two primary use cases supported byTAP::Harness for plugins areinput andoutput:

#Customize how TAP gets into the parser

To do this, you can either extend an existingTAP::Parser::SourceHandler, or write your own. It's a pretty simple API, and they can be loaded and configured using thesources parameter to"new".

#Customize how TAP results are output from the parser

To do this, you can either extend an existingTAP::Formatter, or write your own. Writing formatters are a bit more involved than writing aSourceHandler, as you'll need to understand theTAP::Parser API. A good place to start is by understanding how"aggregate_tests" works.

Custom formatters can be loaded configured using theformatter_class parameter to"new".

#SUBCLASSING

If you can't configureTAP::Harness to do exactly what you want, and writing a plugin isn't an option, consider extending it. It is designed to be (mostly) easy to subclass, though the cases when sub-classing is necessary should be few and far between.

#Methods

The following methods are ones you may wish to override if you want to subclassTAP::Harness.

#"new"

#"runtests"

#"summary"

#REPLACING

If you like theprove utility andTAP::Parser but you want your own harness, all you need to do is write one and providenew andruntests methods. Then you can use theprove utility like so:

prove --harness My::Test::Harness

Note that whileprove accepts a list of tests (or things to be tested),new has a fairly rich set of arguments. You'll probably want to read over this code carefully to see how all of them are being used.

#SEE ALSO

Test::Harness

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