X-Git-Url: http://git.shiar.net/perl/list-index.git/blobdiff_plain/1c331324738bb8ca05889f1a7baa5e1b40595d38..e5fa8cd7b5cc84943c5f7c32c4f34974613a235b:/t/10-ranges.t

diff --git a/t/10-ranges.t b/t/10-ranges.t
index ef292b1..d96ebb5 100644
--- a/t/10-ranges.t
+++ b/t/10-ranges.t
@@ -2,7 +2,7 @@
 use strict;
 use warnings;
 
-use Test::More tests => 6;
+use Test::More tests => 7;
 use Test::NoWarnings;
 use Data::Dump 'pp';
 
@@ -53,3 +53,32 @@ subtest 'context' => sub {
 	#pp($index->ranges({pagesize => 2, context => 2, length => 1}));
 };
 
+subtest 'distribution' => sub {
+	plan tests => 3;
+	my $index = List::Index->new([qw(
+		kkeg kl km kmlu knsy    koxb kpeo kuaa kuab kuac
+		kuap kuaq kuq kux kzb   lc lg lgu lgua lguc
+		lguq lgur lgus lgx lka  lkq lks lln llq llx
+	)]) or return;
+	is_deeply(
+		$index->ranges({ pagesize=>10, context=>3 }),
+		# shorten 'kuap' to 'ku' because lookbehind is 'kp...'
+		# 'lguq' matches 'lg', but may only backtrack to 'lgu'
+		[qw(-kt ku-lgt lgu-)],
+		'lookbehind'
+	);
+	is_deeply(
+		$index->ranges({ pagesize=>10, context=>4 }),
+		[qw(-kt ku-lf lg-)],
+		'maximal lookahead'
+	);
+	is_deeply(
+		$index->ranges({ pagesize=>10, context=>5 }),
+		# after forwarding 'kuap' to 'lc'
+		# disallow backtracking of 'lguq' to 'lc' to prevent qw[-k l-]
+		# so only lookahead (to 'lkq') remains
+		[qw(-k l-lj lk-)],
+		'lookbehind after full lookahead'
+	);
+}
+