Fixed windows support

Change-Id: I00796d75841ce2728f5bc9bd0524275bfb4f7ef2
diff --git a/t/script/extract.t b/t/script/extract.t
index 2ea1e13..8e7cdfd 100644
--- a/t/script/extract.t
+++ b/t/script/extract.t
@@ -10,6 +10,7 @@
 use Test::More;
 use Test::Output;
 use Data::Dumper;
+use KorAP::XML::Archive;
 use utf8;
 
 my $f = dirname(__FILE__);
@@ -21,6 +22,10 @@
   'extract'
 );
 
+unless (KorAP::XML::Archive::test_unzip) {
+  plan skip_all => 'unzip not found';
+};
+
 # Test without parameters
 stdout_like(
   sub {