public void operationsTest() throws IOException {
        for (int i = 0; i < 100; ++i){
            assertEquals(manager.addValue(i + "key", i + "value"), 0);
        }

        for (int i = 0; i < 100; ++i){
            assertEquals(manager.editValue(i + "key", (i + 100) + "value"), 0);
        }

        for (int i = 0; i < 100; ++i){
            assertEquals(manager.getValue(i + "key"), (i + 100) + "value");
        }

        for (int i = 0; i < 100; ++i){
            assertEquals(manager.deleteValue(i + "key"), 0);
        }
    }