From: Vincent Pit <vince@profvince.com>
Date: Thu, 6 Jan 2011 00:44:08 +0000 (+0100)
Subject: Run lengthy tests with Test::Leaner
X-Git-Tag: v0.07~24
X-Git-Url: http://git.vpit.fr/?p=perl%2Fmodules%2FScalar-Vec-Util.git;a=commitdiff_plain;h=3fdc4bd1cd11d103feda665580f1753297e0a470

Run lengthy tests with Test::Leaner

This includes Test::Leaner 0.02.
---

diff --git a/MANIFEST b/MANIFEST
index a0400cd..ed5ce63 100644
--- a/MANIFEST
+++ b/MANIFEST
@@ -26,4 +26,5 @@ t/91-pod.t
 t/92-pod-coverage.t
 t/95-portability-files.t
 t/99-kwalitee.t
+t/lib/Test/Leaner.pm
 META.yml                                 Module meta-data (added by MakeMaker)
diff --git a/t/30-vcopy-pp.t b/t/30-vcopy-pp.t
index 2ce2773..73e6e1e 100644
--- a/t/30-vcopy-pp.t
+++ b/t/30-vcopy-pp.t
@@ -3,7 +3,8 @@
 use strict;
 use warnings;
 
-use Test::More 'no_plan';
+use lib 't/lib';
+use Test::Leaner 'no_plan';
 
 use Scalar::Vec::Util qw/SVU_SIZE/;
 
diff --git a/t/31-vcopy-copy.t b/t/31-vcopy-copy.t
index af127f8..ac4876c 100644
--- a/t/31-vcopy-copy.t
+++ b/t/31-vcopy-copy.t
@@ -3,7 +3,8 @@
 use strict;
 use warnings;
 
-use Test::More 'no_plan';
+use lib 't/lib';
+use Test::Leaner 'no_plan';
 
 use Scalar::Vec::Util qw/vcopy SVU_SIZE/;
 
diff --git a/t/32-vcopy-move.t b/t/32-vcopy-move.t
index 32d981d..a771839 100644
--- a/t/32-vcopy-move.t
+++ b/t/32-vcopy-move.t
@@ -3,7 +3,8 @@
 use strict;
 use warnings;
 
-use Test::More 'no_plan';
+use lib 't/lib';
+use Test::Leaner 'no_plan';
 
 use Scalar::Vec::Util qw/vcopy SVU_SIZE/;
 
diff --git a/t/40-vshift.t b/t/40-vshift.t
index 4c27c83..635bba2 100644
--- a/t/40-vshift.t
+++ b/t/40-vshift.t
@@ -3,7 +3,8 @@
 use strict;
 use warnings;
 
-use Test::More 'no_plan';
+use lib 't/lib';
+use Test::Leaner 'no_plan';
 
 use Scalar::Vec::Util qw/vshift SVU_SIZE/;
 
diff --git a/t/50-vrot.t b/t/50-vrot.t
index 6ce0c41..0da7f7b 100644
--- a/t/50-vrot.t
+++ b/t/50-vrot.t
@@ -3,7 +3,8 @@
 use strict;
 use warnings;
 
-use Test::More 'no_plan';
+use lib 't/lib';
+use Test::Leaner 'no_plan';
 
 use Scalar::Vec::Util qw/vrot vcopy SVU_SIZE/;
 
diff --git a/t/lib/Test/Leaner.pm b/t/lib/Test/Leaner.pm
new file mode 100644
index 0000000..3365006
--- /dev/null
+++ b/t/lib/Test/Leaner.pm
@@ -0,0 +1,873 @@
+package Test::Leaner;
+
+use 5.006;
+use strict;
+use warnings;
+
+=head1 NAME
+
+Test::Leaner - A slimmer Test::More for when you favor performance over completeness.
+
+=head1 VERSION
+
+Version 0.02
+
+=cut
+
+our $VERSION = '0.02';
+
+=head1 SYNOPSIS
+
+    use Test::Leaner tests => 10_000;
+    for (1 .. 10_000) {
+     ...
+     is $one, 1, "checking situation $_";
+    }
+
+
+=head1 DESCRIPTION
+
+When profiling some L<Test::More>-based test script that contained about 10 000 unit tests, I realized that 60% of the time was spent in L<Test::Builder> itself, even though every single test actually involved a costly C<eval STRING>.
+
+This module aims to be a partial replacement to L<Test::More> in those situations where you want to run a large number of simple tests.
+Its functions behave the same as their L<Test::More> counterparts, except for the following differences :
+
+=over 4
+
+=item *
+
+Stringification isn't forced on the test operands.
+However, L</ok> honors C<'bool'> overloading, L</is> and L</is_deeply> honor C<'eq'> overloading (and just that one) and L</cmp_ok> honors whichever overloading category corresponds to the specified operator.
+
+=item *
+
+L</pass>, L</fail>, L</ok>, L</is>, L</isnt>, L</like>, L</unlike> and L</cmp_ok> are all guaranteed to return the truth value of the test.
+
+=item *
+
+L</like> and L</unlike> don't special case regular expressions that are passed as C<'/.../'> strings.
+A string regexp argument is always treated as a the source of the regexp, making C<like $text, $rx> and C<like $text, qr[$rx]> equivalent to each other and to C<cmp_ok $text, '=~', $rx> (and likewise for C<unlike>).
+
+=item *
+
+L</cmp_ok> throws an exception if the given operator isn't a valid Perl binary operator (except C<'='> and variants).
+It also tests in scalar context, so C<'..'> will be treated as the flip-flop operator and not the range operator.
+
+=item *
+
+L</is_deeply> doesn't guard for memory cycles.
+If the two first arguments present parallel memory cycles, the test may result in an infinite loop.
+
+=item *
+
+The tests don't output any kind of default diagnostic in case of failure ; the rationale being that if you have a large number of tests and a lot of them are failing, then you don't want to be flooded by diagnostics.
+
+=item *
+
+C<use_ok>, C<require_ok>, C<can_ok>, C<isa_ok>, C<new_ok>, C<subtest>, C<explain>, C<TODO> blocks and C<todo_skip> are not implemented.
+
+=back
+
+=cut
+
+use Exporter ();
+
+my $main_process;
+
+BEGIN {
+ $main_process = $$;
+
+ if ($] >= 5.008 and $INC{'threads.pm'}) {
+  my $use_ithreads = do {
+   require Config;
+   no warnings 'once';
+   $Config::Config{useithreads};
+  };
+  if ($use_ithreads) {
+   require threads::shared;
+   *THREADSAFE = sub () { 1 };
+  }
+ }
+ unless (defined &Test::Leaner::THREADSAFE) {
+  *THREADSAFE = sub () { 0 }
+ }
+}
+
+my ($TAP_STREAM, $DIAG_STREAM);
+
+my ($plan, $test, $failed, $no_diag, $done_testing);
+
+our @EXPORT = qw<
+ plan
+ skip
+ done_testing
+ pass
+ fail
+ ok
+ is
+ isnt
+ like
+ unlike
+ cmp_ok
+ is_deeply
+ diag
+ note
+ BAIL_OUT
+>;
+
+=head1 ENVIRONMENT
+
+=head2 C<PERL_TEST_LEANER_USES_TEST_MORE>
+
+If this environment variable is set, L<Test::Leaner> will replace its functions by those from L<Test::More>.
+Moreover, the symbols that are imported you C<use Test::Leaner> will be those from L<Test::More>, but you can still only import the symbols originally defined in L<Test::Leaner> (hence the functions from L<Test::More> that are not implemented in L<Test::Leaner> will not be imported).
+If your version of L<Test::More> is too old and doesn't have some symbols (like L</note> or L</done_testing>), they will be replaced in L<Test::Leaner> by croaking stubs.
+
+This may be useful if your L<Test::Leaner>-based test script fails and you want extra diagnostics.
+
+=cut
+
+sub _handle_import_args {
+ my @imports;
+
+ my $i = 0;
+ while ($i <= $#_) {
+  my $item = $_[$i];
+  my $splice;
+  if (defined $item) {
+   if ($item eq 'import') {
+    push @imports, @{ $_[$i+1] };
+    $splice  = 2;
+   } elsif ($item eq 'no_diag') {
+    lock $plan if THREADSAFE;
+    $no_diag = 1;
+    $splice  = 1;
+   }
+  }
+  if ($splice) {
+   splice @_, $i, $splice;
+  } else {
+   ++$i;
+  }
+ }
+
+ return @imports;
+}
+
+if ($ENV{PERL_TEST_LEANER_USES_TEST_MORE}) {
+ require Test::More;
+
+ my $leaner_stash = \%Test::Leaner::;
+ my $more_stash   = \%Test::More::;
+
+ my %valid_imports;
+
+ for (@EXPORT) {
+  my $replacement = exists $more_stash->{$_} ? *{$more_stash->{$_}}{CODE}
+                                             : undef;
+  if (defined $replacement) {
+   $valid_imports{$_} = 1;
+  } else {
+   $replacement = sub {
+    @_ = ("$_ is not implemented in this version of Test::More");
+    goto &croak;
+   };
+  }
+  no warnings 'redefine';
+  $leaner_stash->{$_} = $replacement;
+ }
+
+ my $import = sub {
+  shift;
+  my @imports = &_handle_import_args;
+  @imports = @EXPORT unless @imports;
+  my @test_more_imports;
+  for (@imports) {
+   if ($valid_imports{$_}) {
+    push @test_more_imports, $_;
+   } else {
+    my $pkg = caller;
+    no strict 'refs';
+    *{$pkg."::$_"} = $leaner_stash->{$_};
+   }
+  }
+  my $test_more_import = 'Test::More'->can('import');
+  @_ = (
+   'Test::More',
+   @_,
+   import => \@test_more_imports,
+  );
+  {
+   lock $plan if THREADSAFE;
+   push @_, 'no_diag' if $no_diag;
+  }
+  goto $test_more_import;
+ };
+
+ no warnings 'redefine';
+ *import = $import;
+
+ return 1;
+}
+
+sub NO_PLAN  () { -1 }
+sub SKIP_ALL () { -2 }
+
+BEGIN {
+ if (THREADSAFE) {
+  threads::shared::share($_) for $plan, $test, $failed, $no_diag, $done_testing;
+ }
+
+ lock $plan if THREADSAFE;
+
+ $plan   = undef;
+ $test   = 0;
+ $failed = 0;
+}
+
+sub carp {
+ my $level = 1 + ($Test::Builder::Level || 0);
+ my @caller;
+ do {
+  @caller = caller $level--;
+ } while (!@caller and $level >= 0);
+ my ($file, $line) = @caller[1, 2];
+ warn @_, " at $file line $line.\n";
+}
+
+sub croak {
+ my $level = 1 + ($Test::Builder::Level || 0);
+ my @caller;
+ do {
+  @caller = caller $level--;
+ } while (!@caller and $level >= 0);
+ my ($file, $line) = @caller[1, 2];
+ die @_, " at $file line $line.\n";
+}
+
+sub _sanitize_comment {
+ $_[0] =~ s/\n+\z//;
+ $_[0] =~ s/#/\\#/g;
+ $_[0] =~ s/\n/\n# /g;
+}
+
+=head1 FUNCTIONS
+
+The following functions from L<Test::More> are implemented and exported by default.
+
+=head2 C<< plan [ tests => $count | 'no_plan' | skip_all => $reason ] >>
+
+See L<Test::More/plan>.
+
+=cut
+
+sub plan {
+ my ($key, $value) = @_;
+
+ return unless $key;
+
+ lock $plan if THREADSAFE;
+
+ croak("You tried to plan twice") if defined $plan;
+
+ my $plan_str;
+
+ if ($key eq 'no_plan') {
+  croak("no_plan takes no arguments") if $value;
+  $plan       = NO_PLAN;
+ } elsif ($key eq 'tests') {
+  croak("Got an undefined number of tests") unless defined $value;
+  croak("You said to run 0 tests")          unless $value;
+  croak("Number of tests must be a positive integer.  You gave it '$value'")
+                                            unless $value =~ /^\+?[0-9]+$/;
+  $plan       = $value;
+  $plan_str   = "1..$value";
+ } elsif ($key eq 'skip_all') {
+  $plan       = SKIP_ALL;
+  $plan_str   = '1..0 # SKIP';
+  if (defined $value) {
+   _sanitize_comment($value);
+   $plan_str .= " $value" if length $value;
+  }
+ } else {
+  my @args = grep defined, $key, $value;
+  croak("plan() doesn't understand @args");
+ }
+
+ if (defined $plan_str) {
+  local $\;
+  print $TAP_STREAM "$plan_str\n";
+ }
+
+ exit 0 if $plan == SKIP_ALL;
+
+ return 1;
+}
+
+sub import {
+ my $class = shift;
+
+ my @imports = &_handle_import_args;
+
+ if (@_) {
+  local $Test::Builder::Level = ($Test::Builder::Level || 0) + 1;
+  &plan;
+ }
+
+ @_ = ($class, @imports);
+ goto &Exporter::import;
+}
+
+=head2 C<< skip $reason => $count >>
+
+See L<Test::More/skip>.
+
+=cut
+
+sub skip {
+ my ($reason, $count) = @_;
+
+ lock $plan if THREADSAFE;
+
+ if (not defined $count) {
+  carp("skip() needs to know \$how_many tests are in the block")
+                                      unless defined $plan and $plan == NO_PLAN;
+  $count = 1;
+ } elsif ($count =~ /[^0-9]/) {
+  carp('skip() was passed a non-numeric number of tests.  Did you get the arguments backwards?');
+  $count = 1;
+ }
+
+ for (1 .. $count) {
+  ++$test;
+
+  my $skip_str = "ok $test # skip";
+  if (defined $reason) {
+   _sanitize_comment($reason);
+   $skip_str  .= " $reason" if length $reason;
+  }
+
+  local $\;
+  print $TAP_STREAM "$skip_str\n";
+ }
+
+ no warnings 'exiting';
+ last SKIP;
+}
+
+=head2 C<done_testing [ $count ]>
+
+See L<Test::More/done_testing>.
+
+=cut
+
+sub done_testing {
+ my ($count) = @_;
+
+ lock $plan if THREADSAFE;
+
+ $count = $test unless defined $count;
+ croak("Number of tests must be a positive integer.  You gave it '$count'")
+                                                 unless $count =~ /^\+?[0-9]+$/;
+
+ if (not defined $plan or $plan == NO_PLAN) {
+  $plan         = $count; # $plan can't be NO_PLAN anymore
+  $done_testing = 1;
+  local $\;
+  print $TAP_STREAM "1..$plan\n";
+ } else {
+  if ($done_testing) {
+   @_ = ('done_testing() was already called');
+   goto &fail;
+  } elsif ($plan != $count) {
+   @_ = ("planned to run $plan tests but done_testing() expects $count");
+   goto &fail;
+  }
+ }
+
+ return 1;
+}
+
+=head2 C<ok $ok [, $desc ]>
+
+See L<Test::More/ok>.
+
+=cut
+
+sub ok ($;$) {
+ my ($ok, $desc) = @_;
+
+ lock $plan if THREADSAFE;
+
+ ++$test;
+
+ my $test_str = "ok $test";
+ unless ($ok) {
+  $test_str   = "not $test_str";
+  ++$failed;
+ }
+ if (defined $desc) {
+  _sanitize_comment($desc);
+  $test_str .= " - $desc" if length $desc;
+ }
+
+ local $\;
+ print $TAP_STREAM "$test_str\n";
+
+ return $ok;
+}
+
+=head2 C<pass [ $desc ]>
+
+See L<Test::More/pass>.
+
+=cut
+
+sub pass (;$) {
+ unshift @_, 1;
+ goto &ok;
+}
+
+=head2 C<fail [ $desc ]>
+
+See L<Test::More/fail>.
+
+=cut
+
+sub fail (;$) {
+ unshift @_, 0;
+ goto &ok;
+}
+
+=head2 C<is $got, $expected [, $desc ]>
+
+See L<Test::More/is>.
+
+=cut
+
+sub is ($$;$) {
+ my ($got, $expected, $desc) = @_;
+ no warnings 'uninitialized';
+ @_ = (
+  (not(defined $got xor defined $expected) and $got eq $expected),
+  $desc,
+ );
+ goto &ok;
+}
+
+=head2 C<isnt $got, $expected [, $desc ]>
+
+See L<Test::More/isnt>.
+
+=cut
+
+sub isnt ($$;$) {
+ my ($got, $expected, $desc) = @_;
+ no warnings 'uninitialized';
+ @_ = (
+  ((defined $got xor defined $expected) or $got ne $expected),
+  $desc,
+ );
+ goto &ok;
+}
+
+my %binops = (
+ 'or'  => 'or',
+ 'xor' => 'xor',
+ 'and' => 'and',
+
+ '||'  => 'hor',
+ ('//' => 'dor') x ($] >= 5.010),
+ '&&'  => 'hand',
+
+ '|'   => 'bor',
+ '^'   => 'bxor',
+ '&'   => 'band',
+
+ 'lt'  => 'lt',
+ 'le'  => 'le',
+ 'gt'  => 'gt',
+ 'ge'  => 'ge',
+ 'eq'  => 'eq',
+ 'ne'  => 'ne',
+ 'cmp' => 'cmp',
+
+ '<'   => 'nlt',
+ '<='  => 'nle',
+ '>'   => 'ngt',
+ '>='  => 'nge',
+ '=='  => 'neq',
+ '!='  => 'nne',
+ '<=>' => 'ncmp',
+
+ '=~'  => 'like',
+ '!~'  => 'unlike',
+ ('~~' => 'smartmatch') x ($] >= 5.010),
+
+ '+'   => 'add',
+ '-'   => 'substract',
+ '*'   => 'multiply',
+ '/'   => 'divide',
+ '%'   => 'modulo',
+ '<<'  => 'lshift',
+ '>>'  => 'rshift',
+
+ '.'   => 'concat',
+ '..'  => 'flipflop',
+ '...' => 'altflipflop',
+ ','   => 'comma',
+ '=>'  => 'fatcomma',
+);
+
+my %binop_handlers;
+
+sub _create_binop_handler {
+ my ($op) = @_;
+ my $name = $binops{$op};
+ croak("Operator $op not supported") unless defined $name;
+ {
+  local $@;
+  eval <<"IS_BINOP";
+sub is_$name (\$\$;\$) {
+ my (\$got, \$expected, \$desc) = \@_;
+ \@_ = (scalar(\$got $op \$expected), \$desc);
+ goto &ok;
+}
+IS_BINOP
+  die $@ if $@;
+ }
+ $binop_handlers{$op} = do {
+  no strict 'refs';
+  \&{__PACKAGE__."::is_$name"};
+ }
+}
+
+=head2 C<like $got, $regexp_expected [, $desc ]>
+
+See L<Test::More/like>.
+
+=head2 C<unlike $got, $regexp_expected, [, $desc ]>
+
+See L<Test::More/unlike>.
+
+=cut
+
+{
+ no warnings 'once';
+ *like   = _create_binop_handler('=~');
+ *unlike = _create_binop_handler('!~');
+}
+
+=head2 C<cmp_ok $got, $op, $expected [, $desc ]>
+
+See L<Test::More/cmp_ok>.
+
+=cut
+
+sub cmp_ok ($$$;$) {
+ my ($got, $op, $expected, $desc) = @_;
+ my $handler = $binop_handlers{$op};
+ unless ($handler) {
+  local $Test::More::Level = ($Test::More::Level || 0) + 1;
+  $handler = _create_binop_handler($op);
+ }
+ @_ = ($got, $expected, $desc);
+ goto $handler;
+}
+
+=head2 C<is_deeply $got, $expected [, $desc ]>
+
+See L<Test::More/is_deeply>.
+
+=cut
+
+BEGIN {
+ local $@;
+ if (eval { require Scalar::Util; 1 }) {
+  *_reftype = \&Scalar::Util::reftype;
+ } else {
+  # Stolen from Scalar::Util::PP
+  require B;
+  my %tmap = qw<
+   B::NULL   SCALAR
+
+   B::HV     HASH
+   B::AV     ARRAY
+   B::CV     CODE
+   B::IO     IO
+   B::GV     GLOB
+   B::REGEXP REGEXP
+  >;
+  *_reftype = sub ($) {
+   my $r = shift;
+
+   return undef unless length ref $r;
+
+   my $t = ref B::svref_2object($r);
+
+   return exists $tmap{$t} ? $tmap{$t}
+                           : length ref $$r ? 'REF'
+                                            : 'SCALAR'
+  }
+ }
+}
+
+sub _deep_ref_check {
+ my ($x, $y, $ry) = @_;
+
+ no warnings qw<numeric uninitialized>;
+
+ if ($ry eq 'ARRAY') {
+  return 0 unless $#$x == $#$y;
+
+  my ($ex, $ey);
+  for (0 .. $#$y) {
+   $ex = $x->[$_];
+   $ey = $y->[$_];
+
+   # Inline the beginning of _deep_check
+   return 0 if defined $ex xor defined $ey;
+
+   next if not(ref $ex xor ref $ey) and $ex eq $ey;
+
+   $ry = _reftype($ey);
+   return 0 if _reftype($ex) ne $ry;
+
+   return 0 unless $ry and _deep_ref_check($ex, $ey, $ry);
+  }
+
+  return 1;
+ } elsif ($ry eq 'HASH') {
+  return 0 unless keys(%$x) == keys(%$y);
+
+  my ($ex, $ey);
+  for (keys %$y) {
+   return 0 unless exists $x->{$_};
+   $ex = $x->{$_};
+   $ey = $y->{$_};
+
+   # Inline the beginning of _deep_check
+   return 0 if defined $ex xor defined $ey;
+
+   next if not(ref $ex xor ref $ey) and $ex eq $ey;
+
+   $ry = _reftype($ey);
+   return 0 if _reftype($ex) ne $ry;
+
+   return 0 unless $ry and _deep_ref_check($ex, $ey, $ry);
+  }
+
+  return 1;
+ } elsif ($ry eq 'SCALAR' or $ry eq 'REF') {
+  return _deep_check($$x, $$y);
+ }
+
+ return 0;
+}
+
+sub _deep_check {
+ my ($x, $y) = @_;
+
+ no warnings qw<numeric uninitialized>;
+
+ return 0 if defined $x xor defined $y;
+
+ # Try object identity/eq overloading first. It also covers the case where
+ # $x and $y are both undefined.
+ # If either $x or $y is overloaded but none has eq overloading, the test will
+ # break at that point.
+ return 1 if not(ref $x xor ref $y) and $x eq $y;
+
+ # Test::More::is_deeply happily breaks encapsulation if the objects aren't
+ # overloaded.
+ my $ry = _reftype($y);
+ return 0 if _reftype($x) ne $ry;
+
+ # Shortcut if $x and $y are both not references and failed the previous
+ # $x eq $y test.
+ return 0 unless $ry;
+
+ # We know that $x and $y are both references of type $ry, without overloading.
+ _deep_ref_check($x, $y, $ry);
+}
+
+sub is_deeply {
+ @_ = (
+  &_deep_check,
+  $_[2],
+ );
+ goto &ok;
+}
+
+sub _diag_fh {
+ my $fh = shift;
+
+ return unless @_;
+
+ lock $plan if THREADSAFE;
+ return if $no_diag;
+
+ my $msg = join '', map { defined($_) ? $_ : 'undef' } @_;
+ _sanitize_comment($msg);
+ return unless length $msg;
+
+ local $\;
+ print $fh "# $msg\n";
+
+ return 0;
+};
+
+=head2 C<diag @text>
+
+See L<Test::More/diag>.
+
+=cut
+
+sub diag {
+ unshift @_, $DIAG_STREAM;
+ goto &_diag_fh;
+}
+
+=head2 C<note @text>
+
+See L<Test::More/note>.
+
+=cut
+
+sub note {
+ unshift @_, $TAP_STREAM;
+ goto &_diag_fh;
+}
+
+=head2 C<BAIL_OUT [ $desc ]>
+
+See L<Test::More/BAIL_OUT>.
+
+=cut
+
+sub BAIL_OUT {
+ my ($desc) = @_;
+
+ lock $plan if THREADSAFE;
+
+ my $bail_out_str = 'Bail out!';
+ if (defined $desc) {
+  _sanitize_comment($desc);
+  $bail_out_str  .= "  $desc" if length $desc; # Two spaces
+ }
+
+ local $\;
+ print $TAP_STREAM "$bail_out_str\n";
+
+ exit 255;
+}
+
+END {
+ if ($main_process == $$ and not $?) {
+  lock $plan if THREADSAFE;
+
+  if (defined $plan) {
+   if ($failed) {
+    $? = $failed <= 254 ? $failed : 254;
+   } elsif ($plan >= 0) {
+    $? = $test == $plan ? 0 : 255;
+   }
+   if ($plan == NO_PLAN) {
+    local $\;
+    print $TAP_STREAM "1..$test\n";
+   }
+  }
+ }
+}
+
+=pod
+
+L<Test::Leaner> also provides some functions of its own, which are never exported.
+
+=head2 C<tap_stream [ $fh ]>
+
+Read/write accessor for the filehandle to which the tests are outputted.
+On write, it also turns autoflush on onto C<$fh>.
+
+Note that it can only be used as a write accessor before you start any thread, as L<threads::shared> cannot reliably share filehandles.
+
+Defaults to C<STDOUT>.
+
+=cut
+
+sub tap_stream (;*) {
+ if (@_) {
+  $TAP_STREAM = $_[0];
+
+  my $fh = select $TAP_STREAM;
+  $|++;
+  select $fh;
+ }
+
+ return $TAP_STREAM;
+}
+
+tap_stream *STDOUT;
+
+=head2 C<diag_stream [ $fh ]>
+
+Read/write accessor for the filehandle to which the diagnostics are printed.
+On write, it also turns autoflush on onto C<$fh>.
+
+Just like L</tap_stream>, it can only be used as a write accessor before you start any thread, as L<threads::shared> cannot reliably share filehandles.
+
+Defaults to C<STDERR>.
+
+=cut
+
+sub diag_stream (;*) {
+ if (@_) {
+  $DIAG_STREAM = $_[0];
+
+  my $fh = select $DIAG_STREAM;
+  $|++;
+  select $fh;
+ }
+
+ return $DIAG_STREAM;
+}
+
+diag_stream *STDERR;
+
+=head2 C<THREADSAFE>
+
+This constant evaluates to true if and only if L<Test::Leaner> is thread-safe, i.e. when this version of C<perl> is at least 5.8, has been compiled with C<useithreads> defined, and L<threads> has been loaded B<before> L<Test::Leaner>.
+In that case, it also needs a working L<threads::shared>.
+
+=head1 DEPENDENCIES
+
+L<perl> 5.6.
+
+L<Exporter>, L<Test::More>.
+
+=head1 AUTHOR
+
+Vincent Pit, C<< <perl at profvince.com> >>, L<http://www.profvince.com>.
+
+You can contact me by mail or on C<irc.perl.org> (vincent).
+
+=head1 BUGS
+
+Please report any bugs or feature requests to C<bug-test-leaner at rt.cpan.org>, or through the web interface at L<http://rt.cpan.org/NoAuth/ReportBug.html?Queue=Test-Leaner>.
+I will be notified, and then you'll automatically be notified of progress on your bug as I make changes.
+
+=head1 SUPPORT
+
+You can find documentation for this module with the perldoc command.
+
+    perldoc Test::Leaner
+
+=head1 COPYRIGHT & LICENSE
+
+Copyright 2010 Vincent Pit, all rights reserved.
+
+This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.
+
+=cut
+
+1; # End of Test::Leaner