private void mockLoadNullInitOffset(
     final String topic, final String group, final Partition partition) {
   EasyMock.expect(
           this.offsetStorage.load(
               EasyMock.eq(topic), EasyMock.contains(group), EasyMock.eq(partition)))
       .andReturn(null);
   this.offsetStorage.initOffset(
       EasyMock.eq(topic), EasyMock.contains(group), EasyMock.eq(partition), EasyMock.eq(0L));
   EasyMock.expectLastCall();
 }