code: public Collection<RegressionSuite> regressionSuites(RegressionSuiteFilter filter) {
          return get(RegressionSuite.class, (filter != null) ? filter : new RegressionSuiteFilter());
      }
docs: Get Regression Suite filtered by the criteria specified in the passed in filter.
  
  @param filter Limit the items returned. If null, then all items are returned.
  @return Collection of items as specified in the filter.