Steffen Müller > Test-Strict-0.08 > Test::Strict



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Module Version: 0.08   Source   Latest Release: Test-Strict-0.23


Test::Strict - Check syntax, presence of use strict; and test coverage


Test::Strict lets you check the syntax, presence of use strict; and presence use warnings; in your perl code. It report its results in standard Test::Simple fashion:

  use Test::Strict tests => 3;
  syntax_ok( 'bin/' );
  strict_ok( 'My::Module', "use strict; in My::Module" );
  warnings_ok( 'lib/My/' );

Module authors can include the following in a t/strict.t and have Test::Strict automatically find and check all perl files in a module distribution:

  use Test::Strict;
  all_perl_files_ok(); # Syntax ok and use strict;


  use Test::Strict;
  all_perl_files_ok( @mydirs );

Test::Strict can also enforce a minimum test coverage the test suite should reach. Module authors can include the following in a t/cover.t and have Test::Strict automatically check the test coverage:

  use Test::Strict;
  all_cover_ok( 80 );  # at least 80% coverage


  use Test::Strict;
  all_cover_ok( 80, 't/' );


The most basic test one can write is "does it compile ?". This module tests if the code compiles and play nice with Test::Simple modules.

Another good practice this module can test is to "use strict;" in all perl files.

By setting a minimum test coverage through all_cover_ok(), a code author can ensure his code is tested above a preset level of kwality throughout the development cycle.

Along with Test::Pod, this module can provide the first tests to setup for a module author.

This module should be able to run under the -T flag for perl >= 5.6. All paths are untainted with the following pattern: qr|^([-+@\w./:\\]+)$| controlled by $Test::Strict::UNTAINT_PATTERN.


syntax_ok( $file [, $text] )

Run a syntax check on $file by running perl -c $file with an external perl interpreter. The external perl interpreter path is stored in $Test::Strict::PERL which can be modified. You may prefer use_ok() from Test::More to syntax test a module. For a module, the path (lib/My/ or the name (My::Module) can be both used.

strict_ok( $file [, $text] )

Check if $file contains a use strict; statement.

This is a pretty naive test which may be fooled in some edge cases. For a module, the path (lib/My/ or the name (My::Module) can be both used.

warnings_ok( $file [, $text] )

Check if warnings have been turned on.

If $file is a module, check if it contains a use warnings; or use warnings::... statement. However, if the perl version is <= 5.6, this test is skipped (use warnings appeared in perl 5.6).

If $file is a script, check if it starts with #!...perl -w. If the -w is not found and perl is >= 5.6, check for a use warnings; or use warnings::... statement.

This is a pretty naive test which may be fooled in some edge cases. For a module, the path (lib/My/ or the name (My::Module) can be both used.

all_perl_files_ok( [ @directories ] )

Applies strict_ok() and syntax_ok() to all perl files found in @directories (and sub directories). If no <@directories> is given, the starting point is one level above the current running script, that should cover all the files of a typical CPAN distribution. A perl file is *.pl or *.pm or *.t or a file starting with #!...perl

If the test plan is defined:

  use Test::Strict tests => 18;

the total number of files tested must be specified.

You can control which tests are run on each perl site through:

  $Test::Strict::TEST_SYNTAX   (default = 1)
  $Test::Strict::TEST_STRICT   (default = 1)
  $Test::Strict::TEST_WARNINGS (default = 0)

all_cover_ok( [coverage_threshold [, @t_dirs]] )

This will run all the tests in @t_dirs (or current script's directory if @t_dirs is undef) under Devel::Cover and calculate the global test coverage of the code loaded by the tests. If the test coverage is greater or equal than coverage_threshold, it is a pass, otherwise it's a fail. The default coverage threshold is 50 (meaning 50% of the code loaded has been covered by test).

The threshold can be modified through $Test::Strict::COVERAGE_THRESHOLD. The path to cover utility can be modified through $Test::Strict::COVER.

The 50% threshold is a completely arbitrary value, which should not be considered as a good enough coverage.

The total coverage is the return value of all_cover_ok().


For all_cover_ok() to work properly, it is strongly advised to install the most recent version of Devel::Cover and use perl 5.8.1 or above. In the case of a make test scenario, all_perl_files_ok() re-run all the tests in a separate perl interpreter, this may lead to some side effects.


Test::More, Test::Pod. Test::Distribution, Test:NoWarnings


Pierre Denis, <>.


Copyright 2005, Pierre Denis, All Rights Reserved.

You may use, modify, and distribute this package under the same terms as Perl itself.

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