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.IX Title "Test::Builder::Module 3perl"
.TH Test::Builder::Module 3perl 2024-05-30 "perl v5.38.2" "Perl Programmers Reference Guide"
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.SH NAME
Test::Builder::Module \- Base class for test modules
.SH SYNOPSIS
.IX Header "SYNOPSIS"
.Vb 2
\&  # Emulates Test::Simple
\&  package Your::Module;
\&
\&  my $CLASS = _\|_PACKAGE_\|_;
\&
\&  use parent \*(AqTest::Builder::Module\*(Aq;
\&  @EXPORT = qw(ok);
\&
\&  sub ok ($;$) {
\&      my $tb = $CLASS\->builder;
\&      return $tb\->ok(@_);
\&  }
\&  
\&  1;
.Ve
.SH DESCRIPTION
.IX Header "DESCRIPTION"
This is a superclass for Test::Builder\-based modules.  It provides a
handful of common functionality and a method of getting at the underlying
Test::Builder object.
.SS Importing
.IX Subsection "Importing"
Test::Builder::Module is a subclass of Exporter which means your
module is also a subclass of Exporter.  \f(CW@EXPORT\fR, \f(CW@EXPORT_OK\fR, etc...
all act normally.
.PP
A few methods are provided to do the \f(CW\*(C`use Your::Module tests => 23\*(C'\fR part
for you.
.PP
\fIimport\fR
.IX Subsection "import"
.PP
Test::Builder::Module provides an \f(CWimport()\fR method which acts in the
same basic way as Test::More's, setting the plan and controlling
exporting of functions and variables.  This allows your module to set
the plan independent of Test::More.
.PP
All arguments passed to \f(CWimport()\fR are passed onto 
\&\f(CW\*(C`Your::Module\->builder\->plan()\*(C'\fR with the exception of 
\&\f(CW\*(C`import =>[qw(things to import)]\*(C'\fR.
.PP
.Vb 1
\&    use Your::Module import => [qw(this that)], tests => 23;
.Ve
.PP
says to import the functions \f(CWthis()\fR and \f(CWthat()\fR as well as set the plan
to be 23 tests.
.PP
\&\f(CWimport()\fR also sets the \f(CWexported_to()\fR attribute of your builder to be
the caller of the \f(CWimport()\fR function.
.PP
Additional behaviors can be added to your \f(CWimport()\fR method by overriding
\&\f(CWimport_extra()\fR.
.PP
\fIimport_extra\fR
.IX Subsection "import_extra"
.PP
.Vb 1
\&    Your::Module\->import_extra(\e@import_args);
.Ve
.PP
\&\f(CWimport_extra()\fR is called by \f(CWimport()\fR.  It provides an opportunity for you
to add behaviors to your module based on its import list.
.PP
Any extra arguments which shouldn't be passed on to \f(CWplan()\fR should be
stripped off by this method.
.PP
See Test::More for an example of its use.
.PP
\&\fBNOTE\fR This mechanism is \fIVERY ALPHA AND LIKELY TO CHANGE\fR as it
feels like a bit of an ugly hack in its current form.
.SS Builder
.IX Subsection "Builder"
Test::Builder::Module provides some methods of getting at the underlying
Test::Builder object.
.PP
\fIbuilder\fR
.IX Subsection "builder"
.PP
.Vb 1
\&  my $builder = Your::Class\->builder;
.Ve
.PP
This method returns the Test::Builder object associated with Your::Class.
It is not a constructor so you can call it as often as you like.
.PP
This is the preferred way to get the Test::Builder object.  You should
\&\fInot\fR get it via \f(CW\*(C`Test::Builder\->new\*(C'\fR as was previously
recommended.
.PP
The object returned by \f(CWbuilder()\fR may change at runtime so you should
call \f(CWbuilder()\fR inside each function rather than store it in a global.
.PP
.Vb 2
\&  sub ok {
\&      my $builder = Your::Class\->builder;
\&
\&      return $builder\->ok(@_);
\&  }
.Ve
.SH "SEE ALSO"
.IX Header "SEE ALSO"
Test2::Manual::Tooling::TestBuilder describes the improved
options for writing testing modules provided by Test2.