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[perl5.git] / TestInit.pm
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4343e7c3 1# This is a replacement for the old BEGIN preamble which heads (or
db7c4376 2# should head) up every core test program to prepare it for running.
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3# Now instead of:
4#
5# BEGIN {
6# chdir 't' if -d 't';
7# @INC = '../lib';
8# }
9#
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10# Its primary purpose is to clear @INC so core tests don't pick up
11# modules from an installed Perl.
12#
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13# t/TEST will use -MTestInit. You may "use TestInit" in the test
14# programs but it is not required.
4343e7c3 15#
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16# P.S. This documentation is not in POD format in order to avoid
17# problems when there are fundamental bugs in perl.
4343e7c3 18
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19package TestInit;
20
5c9e8bc6 21$VERSION = 1.04;
2af1ab88 22
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23# Let tests know they're running in the perl core. Useful for modules
24# which live dual lives on CPAN.
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25# Don't interfere with the taintedness of %ENV, this could perturbate tests.
26# This feels like a better solution than the original, from
27# http://www.xray.mpe.mpg.de/mailing-lists/perl5-porters/2003-07/msg00154.html
28$ENV{PERL_CORE} = $^X;
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29
30sub new_inc {
31 if (${^TAINT}) {
32 @INC = @_;
33 } else {
34 @INC = (@_, '.');
35 }
36}
37
38sub set_opt {
39 my $sep;
40 if ($^O eq 'VMS') {
41 $sep = '|';
1ff5bc37 42 } elsif ($^O eq 'MSWin32') {
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43 $sep = ';';
44 } else {
45 $sep = ':';
46 }
47
48 my $lib = join $sep, @_;
49 if (exists $ENV{PERL5LIB}) {
50 $ENV{PERL5LIB} = $lib . substr $ENV{PERL5LIB}, 0, 0;
51 } else {
52 $ENV{PERL5LIB} = $lib;
53 }
54}
55
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56sub import {
57 my $self = shift;
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58 my @up_2_t = ('../../lib', '../../t');
59 my @new_inc;
60 my ($abs, $chdir, $setopt);
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61 foreach (@_) {
62 if ($_ eq 'U2T') {
8fcfece7 63 @new_inc = @up_2_t;
b6800926 64 $setopt = 1;
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65 } elsif ($_ eq 'U1') {
66 @new_inc = '../lib';
b6800926 67 $setopt = 1;
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68 } elsif ($_ eq 'NC') {
69 delete $ENV{PERL_CORE}
70 } elsif ($_ eq 'A') {
71 $abs = 1;
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72 } elsif ($_ eq 'T') {
73 $chdir = '..'
74 unless -f 't/TEST' && -f 'MANIFEST' && -d 'lib' && -d 'ext';
75 @new_inc = 'lib';
76 $setopt = 1;
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77 } else {
78 die "Unknown option '$_'";
79 }
80 }
81
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82 # Need to default. This behaviour is consistent with previous behaviour,
83 # as the equivalent of this code used to be run at the top level, hence
84 # would happen (unconditionally) before import() was called.
85 unless (@new_inc) {
86 if (-f 't/TEST' && -f 'MANIFEST' && -d 'lib' && -d 'ext') {
87 # We're being run from the top level. Try to change directory, and
88 # set things up correctly. This is a 90% solution, but for
89 # hand-running tests, that's good enough
90 if ($0 =~ s!^((?:ext|dist|cpan)[\\/][^\\/]+)[\//](.*\.t)$!$2!) {
91 # Looks like a test in ext.
92 $chdir = $1;
93 @new_inc = @up_2_t;
94 $setopt = 1;
95 $^X =~ s!^\.([/\\])!..$1..$1!;
96 } else {
97 $chdir = 't';
98 @new_inc = '../lib';
99 $setopt = $0 =~ m!^lib/!;
100 }
101 } else {
102 # (likely) we're being run by t/TEST or t/harness, and we're a test
103 # in t/
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104 @new_inc = '../lib';
105 }
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106 }
107
108 if (defined $chdir) {
109 chdir $chdir or die "Can't chdir '$chdir': $!";
110 }
111
112 if ($abs) {
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113 @INC = @new_inc;
114 require File::Spec::Functions;
115 # Forcibly untaint this.
116 @new_inc = map { $_ = File::Spec::Functions::rel2abs($_); /(.*)/; $1 }
117 @new_inc;
118 $^X = File::Spec::Functions::rel2abs($^X);
119 }
120
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121 new_inc(@new_inc);
122 set_opt(@new_inc) if $setopt;
5ed59b83 123}
a1910616 124
7a315204 125$0 =~ s/\.dp$//; # for the test.deparse make target
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1261;
127