1 files changed, 34 insertions, 0 deletions
diff --git a/www/wiki/extensions/Translate/tests/phpunit/utils/MessageGroupStatsTest.php b/www/wiki/extensions/Translate/tests/phpunit/utils/MessageGroupStatsTest.php
new file mode 100644
index 00000000..801ca0da
--- /dev/null
+++ b/www/wiki/extensions/Translate/tests/phpunit/utils/MessageGroupStatsTest.php
@@ -0,0 +1,34 @@
+<?php
+/**
+ * @author Niklas Laxström
+ * @file
+ * @license GPL-2.0-or-later
+ */
+
+class MessageGroupStatsTest extends PHPUnit\Framework\TestCase {
+	public function testGetDatabaseIdForGroupId() {
+		$shortId = 'abab';
+		$longId = str_repeat( 'ab', 100 );
+
+		$this->assertLessThanOrEqual(
+			100,
+			strlen( MessageGroupStats::getDatabaseIdForGroupId( $shortId ) ),
+			'Short id is <= 100 bytes long'
+		);
+
+		$this->assertLessThanOrEqual(
+			100,
+			strlen( MessageGroupStats::getDatabaseIdForGroupId( $longId ) ),
+			'Long id is <= 100 bytes long'
+		);
+
+		$longId1 = str_repeat( 'ab', 100 ) . '1';
+		$longId2 = str_repeat( 'ab', 100 ) . '2';
+
+		$this->assertNotEquals(
+			MessageGroupStats::getDatabaseIdForGroupId( $longId1 ),
+			MessageGroupStats::getDatabaseIdForGroupId( $longId2 ),
+			'Two long ids with the same prefix do not collide'
+		);
+	}
+}