     func testDeleteSequenceOfObjects() {
         let realm = Realm()
         XCTAssertEqual(0, realm.objects(SwiftObject).count)
-        realm.write {
-            let objs = [SwiftObject(), SwiftObject()]
+        var objs: [SwiftObject]!
+        realm.write {
+            objs = [SwiftObject(), SwiftObject()]
             realm.add(objs)
             XCTAssertEqual(2, realm.objects(SwiftObject).count)
             realm.delete(objs)
             XCTAssertEqual(0, realm.objects(SwiftObject).count)
         }
         XCTAssertEqual(0, realm.objects(SwiftObject).count)
+
+        let testRealm = realmWithTestPath()
+        assertThrows(testRealm.delete(objs))
+        testRealm.write {
+            self.assertThrows(testRealm.delete(objs))
+        }
     }
 
     func testDeleteAll() {

            XCTAssertEqual(1, realm.objects(SwiftPrimaryStringObject).count)
        }
        XCTAssertEqual(1, realm.objects(SwiftPrimaryStringObject).count)
    }

    func testDeleteSingleObject() {
        let realm = Realm()
        XCTAssertEqual(0, realm.objects(SwiftObject).count)
        realm.write {
            let obj = SwiftObject()
            realm.add(obj)
            XCTAssertEqual(1, realm.objects(SwiftObject).count)
            realm.delete(obj)
            XCTAssertEqual(0, realm.objects(SwiftObject).count)
        }
        XCTAssertEqual(0, realm.objects(SwiftObject).count)
    }

    func testDeleteListOfObjects() {

            XCTAssertEqual(2, realm.objects(SwiftObject).count)
        }
        XCTAssertEqual(2, realm.objects(SwiftObject).count)

        let testRealm = realmWithTestPath()
        testRealm.write {
            self.assertThrows(testRealm.add(realm.objects(SwiftObject)))
        }
    }

    func testAddOrUpdateSingleObject() {
        let realm = Realm()
        XCTAssertEqual(0, realm.objects(SwiftPrimaryStringObject).count)
        var defaultRealmObject: SwiftPrimaryStringObject!
        realm.write {
            defaultRealmObject = SwiftPrimaryStringObject()
            realm.addOrUpdate(defaultRealmObject)
            XCTAssertEqual(1, realm.objects(SwiftPrimaryStringObject).count)
            realm.addOrUpdate(SwiftPrimaryStringObject())
            XCTAssertEqual(1, realm.objects(SwiftPrimaryStringObject).count)
        }
        XCTAssertEqual(1, realm.objects(SwiftPrimaryStringObject).count)

        let testRealm = realmWithTestPath()
        testRealm.write {
            self.assertThrows(testRealm.addOrUpdate(defaultRealmObject))
        }
    }

    func testAddOrUpdateMultipleObjects() {
