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.\"
.IX Title "Test::Mock::Guard 3pm"
.TH Test::Mock::Guard 3pm 2026-03-04 "perl v5.40.2" "User Contributed Perl Documentation"
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.SH NAME
Test::Mock::Guard \- Simple mock test library using RAII.
.SH SYNOPSIS
.IX Header "SYNOPSIS"
.Vb 2
\&  use Test::More;
\&  use Test::Mock::Guard qw(mock_guard);
\&
\&  package Some::Class;
\&
\&  sub new { bless {} => shift }
\&  sub foo { "foo" }
\&  sub bar { 1; }
\&
\&  package main;
\&
\&  {
\&      my $guard = mock_guard( \*(AqSome::Class\*(Aq, { foo => sub { "bar" }, bar => 10 } );
\&      my $obj = Some::Class\->new;
\&      is( $obj\->foo, "bar" );
\&      is( $obj\->bar, 10 );
\&  }
\&
\&  my $obj = Some::Class\->new;
\&  is( $obj\->foo, "foo" );
\&  is( $obj\->bar, 1 );
\&
\&  done_testing;
.Ve
.SH DESCRIPTION
.IX Header "DESCRIPTION"
Test::Mock::Guard is mock test library using RAII.
This module is able to change method behavior by each scope. See SYNOPSIS's sample code.
.SH "EXPORT FUNCTION"
.IX Header "EXPORT FUNCTION"
.ie n .SS "mock_guard( @class_defs )"
.el .SS "mock_guard( \f(CW@class_defs\fP )"
.IX Subsection "mock_guard( @class_defs )"
\&\f(CW@class_defs\fR have the following format.
.IP key 4
.IX Item "key"
Class name or object to mock.
.IP value 4
.IX Item "value"
Hash reference. Keys are method names; values are code references or scalars.
If the value is code reference, it is used as a method.
If the value is a scalar, the method will return the specified value.
.PP
You can mock instance methods as well as class methods (this feature was provided by cho45):
.PP
.Vb 2
\&  use Test::More;
\&  use Test::Mock::Guard qw(mock_guard);
\&
\&  package Some::Class;
\&
\&  sub new { bless {} => shift }
\&  sub foo { "foo" }
\&
\&  package main;
\&
\&  my $obj1 = Some::Class\->new;
\&  my $obj2 = Some::Class\->new;
\&
\&  {
\&      my $obj2 = Some::Class\->new;
\&      my $guard = mock_guard( $obj2, { foo => sub { "bar" } } );
\&      is ($obj1\->foo, "foo", "obj1 has not changed" );
\&      is( $obj2\->foo, "bar", "obj2 is mocked" );
\&  }
\&
\&  is( $obj1\->foo, "foo", "obj1" );
\&  is( $obj2\->foo, "foo", "obj2" );
\&
\&  done_testing;
.Ve
.SH METHODS
.IX Header "METHODS"
.ie n .SS "new( @class_defs )"
.el .SS "new( \f(CW@class_defs\fP )"
.IX Subsection "new( @class_defs )"
See "mock_guard" definition.
.ie n .SS "call_count( $class_name_or_object, $method_name )"
.el .SS "call_count( \f(CW$class_name_or_object\fP, \f(CW$method_name\fP )"
.IX Subsection "call_count( $class_name_or_object, $method_name )"
Returns a number of calling of \f(CW$method_name\fR in \f(CW$class_name_or_object\fR.
.SH AUTHOR
.IX Header "AUTHOR"
Toru Yamaguchi <zigorou@cpan.org>
.PP
Yuji Shimada <xaicron at cpan.org>
.PP
Masaki Nakagawa <masaki@cpan.org>
.SH "THANKS TO"
.IX Header "THANKS TO"
cho45 <cho45@lowreal.net>
.SH "SEE ALSO"
.IX Header "SEE ALSO"
Test::MockObject
.SH LICENSE
.IX Header "LICENSE"
This library is free software; you can redistribute it and/or modify
it under the same terms as Perl itself.