Before looking at the test code, you need a better understanding of the Rails user interface layer.
在查看测试代码之前,需要对Rails的用户界面层有更好的理解。
Step 4: Create a new layer by clicking the paper-looking icon at the bottom of the Layers palette (circled in red below).
第四步:点击图层面板中像纸片一样的那个图标,建立一个新图层。
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