private Set<String> createKeySet(final String... keys) {
    Set<String> keySet = new HashSet<>();
    for (String key : keys) {
      keySet.add(key);
    }
    return keySet;
  }
Assert the {@link RegionFunctionContext} yields the proper objects.
geode-core/src/distributedTest/java/org/apache/geode/internal/cache/execute/PRFunctionExecutionDUnitTest.java