tests: Fix test isolation on object storage

Signed-off-by: Julius Härtl <jus@bitgrid.net>

apps/files_sharing/tests/TestCase.php

@@ -211,7 +211,11 @@ protected static function loginHelper($user, $create = false, $password = false)
 		\OC::$server->getUserSession()->setUser(null);
 		\OC\Files\Filesystem::tearDown();
 		\OC::$server->getUserSession()->login($user, $password);
-		\OC::$server->getUserFolder($user);
+		// We need to get the directory listing to trigger the lazy user folder
+		// to create the files directory. Since the filecache might get cleared
+		// in the cache, any follow up test case may fail as with object storage
+		// the filecache represents the file structure
+		\OC::$server->getUserFolder($user)->getDirectoryListing();
 
 		\OC_Util::setupFS($user);
 	}

lib/base.php

@@ -855,6 +855,23 @@ public static function registerCleanupHooks(\OC\SystemConfig $systemConfig): voi
 					$throttler = Server::get(\OC\Security\Bruteforce\Throttler::class);
 					$throttler->resetDelay($request->getRemoteAddress(), 'login', ['user' => $uid]);
 				}
+
+				try {
+					$cache = new \OC\Cache\File();
+					$cache->gc();
+				} catch (\OC\ServerNotAvailableException $e) {
+					// not a GC exception, pass it on
+					throw $e;
+				} catch (\OC\ForbiddenException $e) {
+					// filesystem blocked for this request, ignore
+				} catch (\Exception $e) {
+					// a GC exception should not prevent users from using OC,
+					// so log the exception
+					Server::get(LoggerInterface::class)->warning('Exception when running cache gc.', [
+						'app' => 'core',
+						'exception' => $e,
+					]);
+				}
 			});
 		}
 	}