test: add regression test for default infinite lock timeout (-1)

Verifies that LOCK_TIMEOUT = -1 (the default) produces ETA_INFINITE
rather than a negative timeout value that clients misread as a past expiry.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Signed-off-by: James Manuel <moodyjmz@users.noreply.github.com>

Author: moodyjmz

tests/Feature/LockFeatureTest.php

@@ -387,6 +387,21 @@ public function testExtendLock() {
 		$this->assertEquals($id, $locks[0]->getId());
 	}
 
+	/**
+	 * Default config (LOCK_TIMEOUT = -1) must produce ETA_INFINITE, not a negative timestamp.
+	 * Regression: getTimeout() returned -60 which clients interpreted as a past expiry.
+	 */
+	public function testDefaultInfiniteTimeoutProducesEtaInfinite() {
+		\OCP\Server::get(IConfig::class)->setAppValue(Application::APP_ID, ConfigService::LOCK_TIMEOUT, '-1');
+
+		$file = $this->loginAndGetUserFolder(self::TEST_USER1)->newFile('test-file', 'AAA');
+		$this->lockManager->lock(new LockContext($file, ILock::TYPE_USER, self::TEST_USER1));
+		$locks = $this->lockManager->getLocks($file->getId());
+
+		$this->assertCount(1, $locks);
+		$this->assertEquals(FileLock::ETA_INFINITE, $locks[0]->getEta());
+	}
+
 	/**
 	 * Regression test for https://github.com/nextcloud/files_lock/issues/130
 	 */