test that random junk in PERL_LOCAL_LIB_ROOT is ignored

diff --git a/t/bad_variables.t b/t/bad_variables.t
new file mode 100644 (file)
index 0000000..96e1992
--- /dev/null
+++ b/t/bad_variables.t
@@ -0,0 +1,34 @@
+use strict;
+use warnings;
+use Test::More tests => 5;
+use File::Temp 'tempdir';
+use local::lib ();
+
+# remember the original value of this, in case we are already running inside a
+# local::lib
+my $orig_llr = $ENV{PERL_LOCAL_LIB_ROOT};
+
+my $dir1 = tempdir('test_local_lib-XXXXX', DIR => Cwd::abs_path('t'), CLEANUP => 1);
+my $dir2 = tempdir('test_local_lib-XXXXX', DIR => Cwd::abs_path('t'), CLEANUP => 1);
+my $dir3 = tempdir('test_local_lib-XXXXX', DIR => Cwd::abs_path('t'), CLEANUP => 1);
+
+ok(!(grep { $dir1 eq $_ } @INC), 'new dir is not already in @INC');
+ok(!(grep { $dir1 eq $_ } split /:/, $ENV{PERL5LIB}), 'new dir is not already in PERL5LIB');
+
+local::lib->import($dir1);
+local::lib->import($dir2);
+
+# we have junk in here now
+$ENV{PERL_LOCAL_LIB_ROOT} .= ':' . $dir3;
+
+local::lib->import($dir1);
+
+is(
+    $ENV{PERL_LOCAL_LIB_ROOT},
+    join(':', $orig_llr, $dir2, $dir1),
+    'dir1 should have been removed and added back in at the top',
+);
+
+ok((grep { /\Q$dir1\E/ } @INC), 'new dir has been added to @INC');
+ok((grep { /\Q$dir1\E/ } split /:/, $ENV{PERL5LIB}), 'new dir has been added to PERL5LIB');
+