@Test public void testDelimiterConf() {

  String filename = getTestFilename("test-metrics2-delimiter");
  new ConfigBuilder().add("p1.foo", "p1foo1,p1foo2,p1foo3").save(filename);
  MetricsConfig mc = MetricsConfig.create("p1", filename);
  Configuration expected = new ConfigBuilder()
      .add("foo", "p1foo1")
      .add("foo", "p1foo2")
      .add("foo", "p1foo3")
      .config;
  assertEq(expected, mc);
}