def __init__(self, test, tags, actual_result, step, build_id):
    """
    Args:
      test: A string containing the name of the test.
      tags: An iterable containing the typ tags for the result.
      actual_result: The actual result of the test as a string.
      step: A string containing the name of the step on the builder.
      build_id: A string containing the Buildbucket ID for the build this result
          came from.
    """
    self.test = test
    self.tags = frozenset(tags)
    self.actual_result = actual_result
    self.step = step
    self.build_id = build_id