private Map<String, Integer> createEntryMap(final int count, final String keyPrefix,
      final int startKey, final int startValue) {
    Map<String, Integer> entryMap = new HashMap<>();
    int value = startValue;
    for (int keyIndex = startKey; keyIndex < startKey + count; keyIndex++) {
      entryMap.put(keyPrefix + keyIndex, value++);
    }
    return entryMap;
  }
Assert the {@link RegionFunctionContext} yields the proper objects.
geode-core/src/distributedTest/java/org/apache/geode/internal/cache/execute/PRFunctionExecutionDUnitTest.java