Manpages - TAP_Harness.3perl
Table of Contents
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NAME
TAP::Harness - Run test scripts with statistics
VERSION
Version 3.43
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 new TAP::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. Uses Time::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 return =undef
, 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 the TAP::Parser::SourceHandlers to load and/or configure. The values are a hash of configuration that will be accessible 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 }, } The =sources
parameter affects howsource
,tap
andexec
parameters are handled. For more details, see thesources
parameter in new in TAP::Parser, TAP::Parser::Source, and TAP::Parser::IteratorFactory.aggregator_class
The name of the class to use to aggregate test results. The default is TAP::Parser::Aggregator.version
NEW to 3.22. Assume this TAP version for TAP::Parser instead of default TAP version 12.formatter_class
The name of the class to use to format output. The default is TAP::Formatter::Console, or TAP::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 is TAP::Parser::Multiplexer.parser_class
The name of the class to use to parse TAP. The default is TAP::Parser.scheduler_class
The name of the class to use to schedule test execution. The default is TAP::Parser::Scheduler.formatter
If setformatter
must be an object that is capable of formatting the TAP output. See TAP::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 => 1directives
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. If no rules are declared and CPAN::Meta::YAML is available,TAP::Harness
attempts to load rules from a YAML file specified by therulesfile
parameter. If no rules file exists, the default is for all tests to be eligible to be run in parallel. Here some simple examples. For the full details of the data structure and the related glob-style pattern matching, see Rules data structure in TAP::Parser::Scheduler. # Run all tests in sequence, except those starting with “p” $harness->rules({ par => t/p*.t }); # Equivalent YAML file — par: t/p*.t # Run all tests in parallel, except those starting with “p” $harness->rules({ seq => [ { seq => t/p*.t }, { par => * }, ], }); # Equivalent YAML file — seq: - seq: t/p.t - par: * # Run some startup tests in sequence, then some parallel tests than some # teardown tests in sequence. $harness->rules({ seq => [ { seq => t/startup/.t }, { par => [t/a/*.t,t/b/*.t,t/c/*.t], } { seq => t/shutdown/*.t }, ], }); # Equivalent YAML file — seq: - seq: t/startup/*.t - par: - t/a/*.t - t/b/*.t - t/c/*.t - seq: t/shutdown/*.t This is an experimental feature and the interface may change.rulesfiles
This specifies where to find a YAML file of test scheduling rules. If not provided, it looks for a default file to use. It first checks for a file given in theHARNESS_RULESFILE
environment variable, then it checks for testrules.yml and then t/testrules.yml.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 is undef
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 to TAP::Parser::new()
as a source
. See TAP::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 variable PERL_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 a TAP::Parser::Aggregator containing the test results.
summary
$harness->summary( $aggregator );
Output the summary for a TAP::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 supplied TAP::Parser::Aggregator.
aggregate_tests
may be called multiple times to run several sets of
tests. Multiple Test::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 different TAP::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 to runtests
.
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, typically source 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 a TAP::Parser::Scheduler.
Override in a subclass to provide an alternative scheduler.
make_scheduler
is passed the list of tests that was passed to
aggregate_tests
.
jobs
Gets or sets the number of concurrent test runs the harness is handling. By default, this value is 1 Ω- 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 is input to and
output from the parser.
TAP::Parser::SourceHandlers handle TAP input. You can configure them
and load custom handlers using the sources
parameter to new.
TAP::Formatters handle TAP output. You can load custom formatters by
using the formatter_class
parameter to new. To configure a formatter,
you currently need to instantiate it outside of TAP::Harness and pass it
in with the formatter
parameter to new. This may be addressed by
adding a formatters parameter to new in the future.
“Module::Build”
Module::Build version 0.30
supports TAP::Harness
.
To load TAP::Harness
plugins, you’ll need to use the
tap_harness_args
parameter to new
, typically from your Build.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 support TAP::Harness out-of-the-box.
“prove”
prove supports TAP::Harness
plugins, and has a plugin system of its
own. See FORMATTERS in prove, SOURCE HANDLERS in prove and App::Prove
for more details.
WRITING PLUGINS
If you can’t configure TAP::Harness
to do what you want, and you can’t
find an existing plugin, consider writing one.
The two primary use cases supported by TAP::Harness for plugins are input and output:
- Customize how TAP gets into the parser
- To do this, you can either
extend an existing TAP::Parser::SourceHandler, or write your own. It’s
a pretty simple API, and they can be loaded and configured using the
sources
parameter to new. - Customize how TAP results are output from the parser
- To do this,
you can either extend an existing TAP::Formatter, or write your own.
Writing formatters are a bit more involved than writing a
SourceHandler, as you’ll need to understand the TAP::Parser API. A
good place to start is by understanding how aggregate_tests works.
Custom formatters can be loaded configured using the
formatter_class
parameter to new.
SUBCLASSING
If you can’t configure TAP::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
subclass TAP::Harness
.
- “new”
- “runtests”
- “summary”
REPLACING
If you like the prove
utility and TAP::Parser but you want your own
harness, all you need to do is write one and provide new
and
runtests
methods. Then you can use the prove
utility like so:
prove –harness My::Test::Harness
Note that while prove
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