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
|
package Test::NeedsDisplay;
=pod
=head1 NAME
Test::NeedsDisplay - Ensure that tests needing a display have one
=head1 SYNOPSIS
In your Makefile.PL...
use inc::Module::Install;
# ... or whatever else you use
# Check for a display
use Test::NeedsDisplay;
# ... your Makefile.PL content as normal
And again in each test script that loads L<Wx>
#!/usr/bin/perl
use strict;
use Test::NeedsDisplay;
# Test content as normal...
=head1 DESCRIPTION
When testing GUI applications, sometimes applications or modules
absolutely insist on a display, even just to load a module without
actually showing any objects.
Regardless, this makes GUI applications pretty much impossible to
build and test on headless or automated systems. And it fails to
the point of not even running the Makefile.PL script because
a dependency needs a display so it can be loaded to find a version.
In these situations, what is needed is a fake display.
The C<Test::NeedsDisplay> module will search around and try to find
a way to load some sort of display that can be used for the testing.
=head2 Strategies for Finding a Display
At this time, only a single method is used (and a very simple one).
Debian Linux has a script called C<xvfb-run> which is a wrapper for
the C<xvfb>, a virtual X server which uses the linux frame buffer.
When loaded without a viable display, the module will re-exec the
same script using something like (for example) C<xvfb-run test.t>.
As such, it should be loaded as early as possible, before anything
has a chance to change script parameters. These params will be
resent through to the script again.
=head1 METHODS
There are no methods. You simply use the module as early as possible,
probably right after C<use strict;> and make sure to load it with
only default params.
Specifically, need must B<always> load it before you set the test plan,
otherwise the test script will report two plans, and the harness will
complain about it and die.
# Use it like this ...
use Test::NeedsDisplay;
# ... not like this ...
use Test::NeedsDisplay 'anything';
# ... and not like this.
use Test::NeedsDisplay ();
And that's all there is to do. The module will take care of the rest.
=cut
use 5.006;
use strict;
use Config ();
use File::Spec ();
use Test::More ();
use vars qw{$VERSION};
BEGIN {
$VERSION = '1.07';
}
sub import {
# Get rid of Win32 and existing DISPLAY cases
return 1 if $^O eq 'MSWin32';
return 1 if $ENV{DISPLAY};
# The quick way is to use the xvfb-run script
print "# No DISPLAY. Looking for xvfb-run...\n";
my @PATHS = split $Config::Config{path_sep}, $ENV{PATH};
foreach my $path ( @PATHS ) {
my $xvfb_run = File::Spec->catfile( $path, 'xvfb-run' );
next unless -e $xvfb_run;
next unless -x $xvfb_run;
print "# Restarting with xvfb-run...\n";
exec(
$xvfb_run,
$^X,
($INC{'blib.pm'} ? '-Mblib' : ()),
($INC{'perl5db.pl'} ? '-d' : ()),
$0,
);
}
# If provided with the :skip_all, abort the run
if ( $_[1] and $_[1] eq ':skip_all' ) {
Test::More::plan( skip_all => 'Test needs a DISPLAY' );
exit(0);
}
print "# Failed to find xvfb-run.\n";
print "# Running anyway, but will probably fail...\n";
}
1;
=pod
=head1 TO DO
- Find alternative ways to launch a display on different platforms
=head1 SUPPORT
Bugs should be reported via the CPAN bug tracker at
L<http://rt.cpan.org/NoAuth/ReportBug.html?Queue=Test-NeedsDisplay>
For other issues, contact the author.
=head1 AUTHOR
Adam Kennedy E<lt>adamk@cpan.orgE<gt>
=head1 COPYRIGHT
Copyright 2005 - 2009 Adam Kennedy.
This program is free software; you can redistribute
it and/or modify it under the same terms as Perl itself.
The full text of the license can be found in the
LICENSE file included with this module.
=cut
|
