private void fromDeltaCounter(int count) {
    assertTrue(
        "FromDelta counters do not match, expected: " + count + ", but actual: "
            + DeltaTestImpl.getFromDeltaInvokations(),
        DeltaTestImpl.getFromDeltaInvokations() == count);
    DeltaTestImpl.resetDeltaInvokationCounters();
  }
1) One accessor and one datastore is defined with a PR with zero redundant copies. 2) Client is
connected only to the accessor. 3) One delta put is performed on datastore. 4) Flag to cause
toDelta() throw an exception is set on datastore. 5) Another delta put is performed on
datastore. 6) Verify that the second delta put fails and value on datastore is same as the one
put by first delta update.
geode-cq/src/distributedTest/java/org/apache/geode/internal/cache/PRDeltaPropagationDistributedTest.java