static void assertIncrementKey(Cell key, byte[] row, byte[] family, byte[] qualifier, long value)
    throws Exception {
    TestFromClientSide.assertIncrementKey(key, row, family, qualifier, value);
  }
Call over to the adjacent class's method of same name.
hbase-server/src/test/java/org/apache/hadoop/hbase/client/TestIncrementsFromClientSide.java