Do not cleanup any app backups which are referenced by an app through lastBackupId

src/test/backups-test.js

@@ -7,6 +7,7 @@
 'use strict';
 
 var async = require('async'),
+    appdb = require('../appdb.js'),
     backupdb = require('../backupdb.js'),
     backups = require('../backups.js'),
     database = require('../database'),
@@ -158,5 +159,55 @@ describe('backups', function () {
                 }, 2000);
             });
         });
+
+        it('succeeds for app backups not referenced by a box backup or app', function (done) {
+            var APP_0 = {
+                id: 'appid-0',
+                appStoreId: 'appStoreId-0',
+                dnsRecordId: null,
+                installationState: appdb.ISTATE_PENDING_INSTALL,
+                installationProgress: null,
+                runState: null,
+                location: 'some-location-0',
+                manifest: { version: '0.1', dockerImage: 'docker/app0', healthCheckPath: '/', httpPort: 80, title: 'app0' },
+                httpPort: null,
+                containerId: null,
+                portBindings: { port: 5678 },
+                health: null,
+                accessRestriction: null,
+                lastBackupId: null,
+                oldConfig: null,
+                memoryLimit: 4294967296,
+                altDomain: null,
+                xFrameOptions: 'DENY',
+                sso: true,
+                debugMode: null
+            };
+
+            async.eachSeries([BACKUP_0_APP_0, BACKUP_0_APP_1], backupdb.add, function (error) {
+                expect(error).to.not.be.ok();
+
+                // wait for expiration
+                setTimeout(function () {
+                    // now reference one backup
+                    APP_0.lastBackupId = BACKUP_0_APP_0.id;
+
+                    appdb.add(APP_0.id, APP_0.appStoreId, APP_0.manifest, APP_0.location, APP_0.portBindings, APP_0, function (error) {
+                        expect(error).to.not.be.ok();
+
+                        backups.cleanup(function (error) {
+                            expect(error).to.not.be.ok();
+
+                            backupdb.getPaged(backupdb.BACKUP_TYPE_APP, 1, 1000, function (error, result) {
+                                expect(error).to.not.be.ok();
+                                expect(result.length).to.equal(3);
+
+                                done();
+                            });
+                        });
+                    });
+                }, 2000);
+            });
+        });
     });
 });