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.\" ========================================================================
.\"
.IX Title "Test::Builder::Module 3"
.TH Test::Builder::Module 3 "2019-10-24" "perl v5.30.2" "Perl Programmers Reference Guide"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
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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(CW\*(C`import()\*(C'\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(CW\*(C`import()\*(C'\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(CW\*(C`this()\*(C'\fR and \f(CW\*(C`that()\*(C'\fR as well as set the plan
to be 23 tests.
.PP
\&\f(CW\*(C`import()\*(C'\fR also sets the \f(CW\*(C`exported_to()\*(C'\fR attribute of your builder to be
the caller of the \f(CW\*(C`import()\*(C'\fR function.
.PP
Additional behaviors can be added to your \f(CW\*(C`import()\*(C'\fR method by overriding
\&\f(CW\*(C`import_extra()\*(C'\fR.
.PP
\fIimport_extra\fR
.IX Subsection "import_extra"
.PP
.Vb 1
\&    Your::Module\->import_extra(\e@import_args);
.Ve
.PP
\&\f(CW\*(C`import_extra()\*(C'\fR is called by \f(CW\*(C`import()\*(C'\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(CW\*(C`plan()\*(C'\fR should be
stripped off by this method.
.PP
See Test::More for an example of its use.
.PP
\&\fB\s-1NOTE\s0\fR This mechanism is \fI\s-1VERY ALPHA AND LIKELY TO CHANGE\s0\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(CW\*(C`builder()\*(C'\fR may change at runtime so you should
call \f(CW\*(C`builder()\*(C'\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