SQLiteJournal: fixed bug with keys with multiple priority [Closes #35]

Author: sallyx

src/Caching/Storages/SQLiteJournal.php

@@ -44,7 +44,7 @@ public function __construct($path = ':memory:')
 			CREATE INDEX IF NOT EXISTS idx_tags_key ON tags(key);
 			CREATE INDEX IF NOT EXISTS idx_tags_tag ON tags(tag);
 			CREATE UNIQUE INDEX IF NOT EXISTS idx_tags_key_tag ON tags(key, tag);
-			CREATE INDEX IF NOT EXISTS idx_priorities_key ON priorities(key);
+			CREATE UNIQUE INDEX IF NOT EXISTS idx_priorities_key ON priorities(key);
 			CREATE INDEX IF NOT EXISTS idx_priorities_priority ON priorities(priority);
 		');
 	}

tests/Storages/IJournalTestCase.inc

@@ -242,13 +242,16 @@ abstract class IJournalTestCase extends Tester\TestCase
 	final public function testDuplicatedDifferentPriorities()
 	{
 		$this->journal->write('ok_test_bb', [
-			Cache::PRIORITY => 15
+			Cache::PRIORITY => 10
 		]);
 
 		$this->journal->write('ok_test_bb', [
 			Cache::PRIORITY => 20
 		]);
 
+		Assert::same([
+		], $this->journal->clean([Cache::PRIORITY => 15]));
+
 		Assert::same([
 			'ok_test_bb',
 		], $this->journal->clean([Cache::PRIORITY => 30]));