@Override
  public String getDisplayName() {
    return displayName == null ? getName() : displayName;
  }
Returns the name of this iteration. No strong guarantees are provided for this name,
except that it is non-null. For example, it may be the same as the feature name,
and it may not be unique among iterations of the same feature execution.
Nevertheless, this is generally the name that should be presented to the user (if any).

@return the name of this iteration
spock-core/src/main/java/org/spockframework/runtime/model/IterationInfo.java