private Map<String, Number> getOrCreateExpectedValueMap(final Statistics statistics) {
    return allStatistics.computeIfAbsent(statistics.getTextId(), k -> new HashMap<>());
  }
Integration tests for statistics sampling.

@since GemFire 7.0
geode-core/src/integrationTest/java/org/apache/geode/internal/statistics/StatSamplerIntegrationTest.java