@Test
  public void txRollbackIncrementsTxRollbacks() {
    cachePerfStats.txRollback(1, 1, 1);

    assertThat(statistics.getLong(txRollbacksId)).isEqualTo(1);
  }
Characterization test: Note that the only way to increment {@code txRollbacks} is to invoke
{@code txRollback}.
geode-core/src/test/java/org/apache/geode/internal/cache/CachePerfStatsTest.java