private void createRegionWithDiskStore(File baseDir) {
    cache.createDiskStoreFactory().setDiskDirs(new File[] {baseDir}).create(DISK_STORE_NAME);
    cache.<String, String>createRegionFactory(RegionShortcut.PARTITION_PERSISTENT)
        .setDiskStoreName(DISK_STORE_NAME).create(REGION_NAME);
  }
Returns true if the files of the given oplog file are in the
given directory.
geode-core/src/integrationTest/java/org/apache/geode/internal/cache/DiskStoreImplIntegrationTest.java