@Parameterized.Parameters
  public static Collection<Object[]> parameters() {
    return Arrays.asList(new Object[][] { { MasterRegistry.class, 1 }, { MasterRegistry.class, 2 },
      { ZKConnectionRegistry.class, 1 } });
  }
A client-side test, mostly testing scanners with various parameters. Parameterized on different
registry implementations.
hbase-server/src/test/java/org/apache/hadoop/hbase/client/TestScannersFromClientSide.java