They are a safety net - it means that you can refactor the code (e.g. split or merge classes or functions) and tests still pass. If you can’t refactor anything without breaking the tests, something is not right.
Москвичей предупредили о резком похолодании09:45
，更多细节参见safew官方下载
然而，按以往相关要求，包子铺的现制现售区域和生鲜肉销售场所要隔10米以上，或有可密闭遮盖的防护罩等防护措施。但这家冷鲜肉店面积有限，“螺蛳壳”里难“做道场”。，更多细节参见体育直播
Photograph: Julian Chokkattu，推荐阅读同城约会获取更多信息
– If the location or view is unrealistic or fictional, create a composition blending both the location and the view into a single scene.