@Override
    public int size() {
        int count = 0;
        for (PipelineConfigs part : this.parts) {
            count += part.size();
        }
        return count;
    }
@Test
    public void shouldReturnSizeSummedFrom2ConfigParts() {
        PipelineConfigs group = new MergePipelineConfigs(
                new BasicPipelineConfigs(PipelineConfigMother.pipelineConfig("pipeline1")),
                new BasicPipelineConfigs(PipelineConfigMother.pipelineConfig("pipeline2")));
        assertThat(group.size(), is(2));
    }