    @Test
    public void testSetTreeshake() throws Exception {

        configBuilder = configBuilderArgParser.setTreeshake(configBuilder, Config.TreeShakerMode.aggressive.toString());
        assert(configBuilder.getConfig().getTreeShakerMode().equals(Config.TreeShakerMode.aggressive));

        exception.expect(IllegalArgumentException.class);
        configBuilder = configBuilderArgParser.setTreeshake(configBuilder, "invalid");

    }