@Test
  public void incEntryCount_whenDeltaIsPositive_increasesTheEntryCountStat() {
    cachePerfStats.incEntryCount(2);

    assertThat(statistics.getLong(entryCountId)).isEqualTo(2);
  }
Characterization test: {@code deltaFullValuesRequested} currently wraps to negative from max
integer value.
geode-core/src/test/java/org/apache/geode/internal/cache/CachePerfStatsTest.java