@Before
  public void setUp() {
    cache = new CacheFactory().set(LOCATORS, "").set(MCAST_PORT, "0").create();
  }
Cache.createRegionFactory should return a new instance with default values.

<p>
Prior to the bug fix, Cache.createRegionFactory was internally reusing a modifiable instance of
RegionAttributes.

<p>
TRAC #51616: Cache.getRegionAttributes returns modifiable RegionAttributes, with unintended side
effects

<p>
Before the bug was fixed, the 2nd regionFactory.create threw this call stack:

<pre>
java.lang.IllegalStateException: FixedPartitionAttributes "[FixedPartitionAttributes@[partitionName=one;isPrimary=true;numBuckets=111]]" can not be specified in PartitionAttributesFactory if colocated-with is specified.
    at com.gemstone.gemfire.internal.cache.PartitionAttributesImpl.validateWhenAllAttributesAreSet(PartitionAttributesImpl.java:569)
    at com.gemstone.gemfire.cache.AttributesFactory.validateAttributes(AttributesFactory.java:1515)
    at com.gemstone.gemfire.cache.AttributesFactory.create(AttributesFactory.java:1392)
    at com.gemstone.gemfire.cache.RegionFactory.create(RegionFactory.java:839)
    at PartitionAttributesTest.modifiedVcopsCreateCollocatedFixedRegions(PartitionAttributesTest.java:155)
    at PartitionAttributesTest.main(PartitionAttributesTest.java:47)
</pre>
geode-core/src/integrationTest/java/org/apache/geode/internal/CreateRegionFactoryNewInstanceRegressionTest.java