private ITaskConfig checkConstraint(
      IJobKey job,
      AttributeAggregate aggregate,
      IHostAttributes hostAttributes,
      String constraintName,
      boolean expected,
      ValueConstraint value) {

    Constraint constraint = new Constraint(constraintName, TaskConstraint.value(value));
    ITaskConfig task = makeTask(job, constraint);
    assertEquals(
        expected,
        defaultFilter
            .filter(
                new UnusedResource(DEFAULT_OFFER, hostAttributes),
                new ResourceRequest(task, aggregate))
            .isEmpty());

    Constraint negated = constraint.deepCopy();
    negated.getConstraint().getValue().setNegated(!value.isNegated());
    ITaskConfig negatedTask = makeTask(job, negated);
    assertEquals(
        !expected,
        defaultFilter
            .filter(
                new UnusedResource(DEFAULT_OFFER, hostAttributes),
                new ResourceRequest(negatedTask, aggregate))
            .isEmpty());
    return task;
  }
 private static Constraint makeConstraint(String name, String... values) {
   return new Constraint(
       name, TaskConstraint.value(new ValueConstraint(false, ImmutableSet.copyOf(values))));
 }