summaryrefslogtreecommitdiff
path: root/systems/texlive/tlnet/tlpkg/tlperl/lib/Test/Builder/Tester.pm
blob: da98e3d9a07319f62b7b27504046f0f4b2f594fb (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
package Test::Builder::Tester;

use strict;
our $VERSION = '1.302175';

use Test::Builder;
use Symbol;
use Carp;

=head1 NAME

Test::Builder::Tester - test testsuites that have been built with
Test::Builder

=head1 SYNOPSIS

    use Test::Builder::Tester tests => 1;
    use Test::More;

    test_out("not ok 1 - foo");
    test_fail(+1);
    fail("foo");
    test_test("fail works");

=head1 DESCRIPTION

A module that helps you test testing modules that are built with
L<Test::Builder>.

The testing system is designed to be used by performing a three step
process for each test you wish to test.  This process starts with using
C<test_out> and C<test_err> in advance to declare what the testsuite you
are testing will output with L<Test::Builder> to stdout and stderr.

You then can run the test(s) from your test suite that call
L<Test::Builder>.  At this point the output of L<Test::Builder> is
safely captured by L<Test::Builder::Tester> rather than being
interpreted as real test output.

The final stage is to call C<test_test> that will simply compare what you
predeclared to what L<Test::Builder> actually outputted, and report the
results back with a "ok" or "not ok" (with debugging) to the normal
output.

=cut

####
# set up testing
####

my $t = Test::Builder->new;

###
# make us an exporter
###

use Exporter;
our @ISA = qw(Exporter);

our @EXPORT = qw(test_out test_err test_fail test_diag test_test line_num);

sub import {
    my $class = shift;
    my(@plan) = @_;

    my $caller = caller;

    $t->exported_to($caller);
    $t->plan(@plan);

    my @imports = ();
    foreach my $idx ( 0 .. $#plan ) {
        if( $plan[$idx] eq 'import' ) {
            @imports = @{ $plan[ $idx + 1 ] };
            last;
        }
    }

    __PACKAGE__->export_to_level( 1, __PACKAGE__, @imports );
}

###
# set up file handles
###

# create some private file handles
my $output_handle = gensym;
my $error_handle  = gensym;

# and tie them to this package
my $out = tie *$output_handle, "Test::Builder::Tester::Tie", "STDOUT";
my $err = tie *$error_handle,  "Test::Builder::Tester::Tie", "STDERR";

####
# exported functions
####

# for remembering that we're testing and where we're testing at
my $testing = 0;
my $testing_num;
my $original_is_passing;

# remembering where the file handles were originally connected
my $original_output_handle;
my $original_failure_handle;
my $original_todo_handle;
my $original_formatter;

my $original_harness_env;

# function that starts testing and redirects the filehandles for now
sub _start_testing {
    # Hack for things that conditioned on Test-Stream being loaded
    $INC{'Test/Stream.pm'} ||= 'fake' if $INC{'Test/Moose/More.pm'};
    # even if we're running under Test::Harness pretend we're not
    # for now.  This needed so Test::Builder doesn't add extra spaces
    $original_harness_env = $ENV{HARNESS_ACTIVE} || 0;
    $ENV{HARNESS_ACTIVE} = 0;

    my $hub = $t->{Hub} || ($t->{Stack} ? $t->{Stack}->top : Test2::API::test2_stack->top);
    $original_formatter = $hub->format;
    unless ($original_formatter && $original_formatter->isa('Test::Builder::Formatter')) {
        my $fmt = Test::Builder::Formatter->new;
        $hub->format($fmt);
    }

    # remember what the handles were set to
    $original_output_handle  = $t->output();
    $original_failure_handle = $t->failure_output();
    $original_todo_handle    = $t->todo_output();

    # switch out to our own handles
    $t->output($output_handle);
    $t->failure_output($error_handle);
    $t->todo_output($output_handle);

    # clear the expected list
    $out->reset();
    $err->reset();

    # remember that we're testing
    $testing     = 1;
    $testing_num = $t->current_test;
    $t->current_test(0);
    $original_is_passing  = $t->is_passing;
    $t->is_passing(1);

    # look, we shouldn't do the ending stuff
    $t->no_ending(1);
}

=head2 Functions

These are the six methods that are exported as default.

=over 4

=item test_out

=item test_err

Procedures for predeclaring the output that your test suite is
expected to produce until C<test_test> is called.  These procedures
automatically assume that each line terminates with "\n".  So

   test_out("ok 1","ok 2");

is the same as

   test_out("ok 1\nok 2");

which is even the same as

   test_out("ok 1");
   test_out("ok 2");

Once C<test_out> or C<test_err> (or C<test_fail> or C<test_diag>) have
been called, all further output from L<Test::Builder> will be
captured by L<Test::Builder::Tester>.  This means that you will not
be able perform further tests to the normal output in the normal way
until you call C<test_test> (well, unless you manually meddle with the
output filehandles)

=cut

sub test_out {
    # do we need to do any setup?
    _start_testing() unless $testing;

    $out->expect(@_);
}

sub test_err {
    # do we need to do any setup?
    _start_testing() unless $testing;

    $err->expect(@_);
}

=item test_fail

Because the standard failure message that L<Test::Builder> produces
whenever a test fails will be a common occurrence in your test error
output, and because it has changed between Test::Builder versions, rather
than forcing you to call C<test_err> with the string all the time like
so

    test_err("# Failed test ($0 at line ".line_num(+1).")");

C<test_fail> exists as a convenience function that can be called
instead.  It takes one argument, the offset from the current line that
the line that causes the fail is on.

    test_fail(+1);

This means that the example in the synopsis could be rewritten
more simply as:

   test_out("not ok 1 - foo");
   test_fail(+1);
   fail("foo");
   test_test("fail works");

=cut

sub test_fail {
    # do we need to do any setup?
    _start_testing() unless $testing;

    # work out what line we should be on
    my( $package, $filename, $line ) = caller;
    $line = $line + ( shift() || 0 );    # prevent warnings

    # expect that on stderr
    $err->expect("#     Failed test ($filename at line $line)");
}

=item test_diag

As most of the remaining expected output to the error stream will be
created by L<Test::Builder>'s C<diag> function, L<Test::Builder::Tester>
provides a convenience function C<test_diag> that you can use instead of
C<test_err>.

The C<test_diag> function prepends comment hashes and spacing to the
start and newlines to the end of the expected output passed to it and
adds it to the list of expected error output.  So, instead of writing

   test_err("# Couldn't open file");

you can write

   test_diag("Couldn't open file");

Remember that L<Test::Builder>'s diag function will not add newlines to
the end of output and test_diag will. So to check

   Test::Builder->new->diag("foo\n","bar\n");

You would do

  test_diag("foo","bar")

without the newlines.

=cut

sub test_diag {
    # do we need to do any setup?
    _start_testing() unless $testing;

    # expect the same thing, but prepended with "#     "
    local $_;
    $err->expect( map { "# $_" } @_ );
}

=item test_test

Actually performs the output check testing the tests, comparing the
data (with C<eq>) that we have captured from L<Test::Builder> against
what was declared with C<test_out> and C<test_err>.

This takes name/value pairs that effect how the test is run.

=over

=item title (synonym 'name', 'label')

The name of the test that will be displayed after the C<ok> or C<not
ok>.

=item skip_out

Setting this to a true value will cause the test to ignore if the
output sent by the test to the output stream does not match that
declared with C<test_out>.

=item skip_err

Setting this to a true value will cause the test to ignore if the
output sent by the test to the error stream does not match that
declared with C<test_err>.

=back

As a convenience, if only one argument is passed then this argument
is assumed to be the name of the test (as in the above examples.)

Once C<test_test> has been run test output will be redirected back to
the original filehandles that L<Test::Builder> was connected to
(probably STDOUT and STDERR,) meaning any further tests you run
will function normally and cause success/errors for L<Test::Harness>.

=cut

sub test_test {
    # END the hack
    delete $INC{'Test/Stream.pm'} if $INC{'Test/Stream.pm'} && $INC{'Test/Stream.pm'} eq 'fake';
    # decode the arguments as described in the pod
    my $mess;
    my %args;
    if( @_ == 1 ) {
        $mess = shift
    }
    else {
        %args = @_;
        $mess = $args{name} if exists( $args{name} );
        $mess = $args{title} if exists( $args{title} );
        $mess = $args{label} if exists( $args{label} );
    }

    # er, are we testing?
    croak "Not testing.  You must declare output with a test function first."
      unless $testing;


    my $hub = $t->{Hub} || Test2::API::test2_stack->top;
    $hub->format($original_formatter);

    # okay, reconnect the test suite back to the saved handles
    $t->output($original_output_handle);
    $t->failure_output($original_failure_handle);
    $t->todo_output($original_todo_handle);

    # restore the test no, etc, back to the original point
    $t->current_test($testing_num);
    $testing = 0;
    $t->is_passing($original_is_passing);

    # re-enable the original setting of the harness
    $ENV{HARNESS_ACTIVE} = $original_harness_env;

    # check the output we've stashed
    unless( $t->ok( ( $args{skip_out} || $out->check ) &&
                    ( $args{skip_err} || $err->check ), $mess ) 
    )
    {
        # print out the diagnostic information about why this
        # test failed

        local $_;

        $t->diag( map { "$_\n" } $out->complaint )
          unless $args{skip_out} || $out->check;

        $t->diag( map { "$_\n" } $err->complaint )
          unless $args{skip_err} || $err->check;
    }
}

=item line_num

A utility function that returns the line number that the function was
called on.  You can pass it an offset which will be added to the
result.  This is very useful for working out the correct text of
diagnostic functions that contain line numbers.

Essentially this is the same as the C<__LINE__> macro, but the
C<line_num(+3)> idiom is arguably nicer.

=cut

sub line_num {
    my( $package, $filename, $line ) = caller;
    return $line + ( shift() || 0 );    # prevent warnings
}

=back

In addition to the six exported functions there exists one
function that can only be accessed with a fully qualified function
call.

=over 4

=item color

When C<test_test> is called and the output that your tests generate
does not match that which you declared, C<test_test> will print out
debug information showing the two conflicting versions.  As this
output itself is debug information it can be confusing which part of
the output is from C<test_test> and which was the original output from
your original tests.  Also, it may be hard to spot things like
extraneous whitespace at the end of lines that may cause your test to
fail even though the output looks similar.

To assist you C<test_test> can colour the background of the debug
information to disambiguate the different types of output. The debug
output will have its background coloured green and red.  The green
part represents the text which is the same between the executed and
actual output, the red shows which part differs.

The C<color> function determines if colouring should occur or not.
Passing it a true or false value will enable or disable colouring
respectively, and the function called with no argument will return the
current setting.

To enable colouring from the command line, you can use the
L<Text::Builder::Tester::Color> module like so:

   perl -Mlib=Text::Builder::Tester::Color test.t

Or by including the L<Test::Builder::Tester::Color> module directly in
the PERL5LIB.

=cut

my $color;

sub color {
    $color = shift if @_;
    $color;
}

=back

=head1 BUGS

Test::Builder::Tester does not handle plans well. It has never done anything
special with plans. This means that plans from outside Test::Builder::Tester
will effect Test::Builder::Tester, worse plans when using Test::Builder::Tester
will effect overall testing. At this point there are no plans to fix this bug
as people have come to depend on it, and Test::Builder::Tester is now
discouraged in favor of C<Test2::API::intercept()>. See
L<https://github.com/Test-More/test-more/issues/667>

Calls C<< Test::Builder->no_ending >> turning off the ending tests.
This is needed as otherwise it will trip out because we've run more
tests than we strictly should have and it'll register any failures we
had that we were testing for as real failures.

The color function doesn't work unless L<Term::ANSIColor> is
compatible with your terminal. Additionally, L<Win32::Console::ANSI>
must be installed on windows platforms for color output.

Bugs (and requests for new features) can be reported to the author
though GitHub:
L<https://github.com/Test-More/test-more/issues>

=head1 AUTHOR

Copyright Mark Fowler E<lt>mark@twoshortplanks.comE<gt> 2002, 2004.

Some code taken from L<Test::More> and L<Test::Catch>, written by
Michael G Schwern E<lt>schwern@pobox.comE<gt>.  Hence, those parts
Copyright Micheal G Schwern 2001.  Used and distributed with
permission.

This program is free software; you can redistribute it
and/or modify it under the same terms as Perl itself.

=head1 MAINTAINERS

=over 4

=item Chad Granum E<lt>exodist@cpan.orgE<gt>

=back

=head1 NOTES

Thanks to Richard Clamp E<lt>richardc@unixbeard.netE<gt> for letting
me use his testing system to try this module out on.

=head1 SEE ALSO

L<Test::Builder>, L<Test::Builder::Tester::Color>, L<Test::More>.

=cut

1;

####################################################################
# Helper class that is used to remember expected and received data

package Test::Builder::Tester::Tie;

##
# add line(s) to be expected

sub expect {
    my $self = shift;

    my @checks = @_;
    foreach my $check (@checks) {
        $check = $self->_account_for_subtest($check);
        $check = $self->_translate_Failed_check($check);
        push @{ $self->{wanted} }, ref $check ? $check : "$check\n";
    }
}

sub _account_for_subtest {
    my( $self, $check ) = @_;

    my $hub = $t->{Stack}->top;
    my $nesting = $hub->isa('Test2::Hub::Subtest') ? $hub->nested : 0;
    return ref($check) ? $check : ('    ' x $nesting) . $check;
}

sub _translate_Failed_check {
    my( $self, $check ) = @_;

    if( $check =~ /\A(.*)#     (Failed .*test) \((.*?) at line (\d+)\)\Z(?!\n)/ ) {
        $check = "/\Q$1\E#\\s+\Q$2\E.*?\\n?.*?\Qat $3\E line \Q$4\E.*\\n?/";
    }

    return $check;
}

##
# return true iff the expected data matches the got data

sub check {
    my $self = shift;

    # turn off warnings as these might be undef
    local $^W = 0;

    my @checks = @{ $self->{wanted} };
    my $got    = $self->{got};
    foreach my $check (@checks) {
        $check = "\Q$check\E" unless( $check =~ s,^/(.*)/$,$1, or ref $check );
        return 0 unless $got =~ s/^$check//;
    }

    return length $got == 0;
}

##
# a complaint message about the inputs not matching (to be
# used for debugging messages)

sub complaint {
    my $self   = shift;
    my $type   = $self->type;
    my $got    = $self->got;
    my $wanted = join '', @{ $self->wanted };

    # are we running in colour mode?
    if(Test::Builder::Tester::color) {
        # get color
        eval { require Term::ANSIColor };
        unless($@) {
            eval { require Win32::Console::ANSI } if 'MSWin32' eq $^O;  # support color on windows platforms

            # colours

            my $green = Term::ANSIColor::color("black") . Term::ANSIColor::color("on_green");
            my $red   = Term::ANSIColor::color("black") . Term::ANSIColor::color("on_red");
            my $reset = Term::ANSIColor::color("reset");

            # work out where the two strings start to differ
            my $char = 0;
            $char++ while substr( $got, $char, 1 ) eq substr( $wanted, $char, 1 );

            # get the start string and the two end strings
            my $start = $green . substr( $wanted, 0, $char );
            my $gotend    = $red . substr( $got,    $char ) . $reset;
            my $wantedend = $red . substr( $wanted, $char ) . $reset;

            # make the start turn green on and off
            $start =~ s/\n/$reset\n$green/g;

            # make the ends turn red on and off
            $gotend    =~ s/\n/$reset\n$red/g;
            $wantedend =~ s/\n/$reset\n$red/g;

            # rebuild the strings
            $got    = $start . $gotend;
            $wanted = $start . $wantedend;
        }
    }

    my @got = split "\n", $got;
    my @wanted = split "\n", $wanted;

    $got = "";
    $wanted = "";

    while (@got || @wanted) {
        my $g = shift @got    || "";
        my $w = shift @wanted || "";
        if ($g ne $w) {
            if($g =~ s/(\s+)$/    |> /g) {
                $g .= ($_ eq ' ' ? '_' : '\t') for split '', $1;
            }
            if($w =~ s/(\s+)$/    |> /g) {
                $w .= ($_ eq ' ' ? '_' : '\t') for split '', $1;
            }
            $g = "> $g";
            $w = "> $w";
        }
        else {
            $g = "  $g";
            $w = "  $w";
        }
        $got = $got ? "$got\n$g" : $g;
        $wanted = $wanted ? "$wanted\n$w" : $w;
    }

    return "$type is:\n" . "$got\nnot:\n$wanted\nas expected";
}

##
# forget all expected and got data

sub reset {
    my $self = shift;
    %$self = (
        type   => $self->{type},
        got    => '',
        wanted => [],
    );
}

sub got {
    my $self = shift;
    return $self->{got};
}

sub wanted {
    my $self = shift;
    return $self->{wanted};
}

sub type {
    my $self = shift;
    return $self->{type};
}

###
# tie interface
###

sub PRINT {
    my $self = shift;
    $self->{got} .= join '', @_;
}

sub TIEHANDLE {
    my( $class, $type ) = @_;

    my $self = bless { type => $type }, $class;

    $self->reset;

    return $self;
}

sub READ     { }
sub READLINE { }
sub GETC     { }
sub FILENO   { }

1;