public static void setTestAvailableOffHeapMemory(final String newTestAvailableOffHeapMemory) {
    testAvailableOffHeapMemory = newTestAvailableOffHeapMemory;
  }
Only used for testing. Sets the amount of available off-heap memory when no distributed system
is available. This method must be called before any instances of PartitionAttributesImpl are
created. Specify the value the same way the off-heap memory property is specified. So, "100m" =
100 megabytes, etc.

@param newTestAvailableOffHeapMemory The new test value for available off-heap memory.
geode-core/src/main/java/org/apache/geode/internal/cache/PartitionAttributesImpl.java