The second test makes sure that a banner with an incorrect height and width cannot be saved, and that the model correctly saves a banner with valid specs.
第二个测试确保高和宽不符合标准的横幅不被保存，具有有效规格的横幅则被正确保存。
The width depends on the size of the banner image and the height is arbitrarily set to a number of pixels.
宽度取决于标志图像的大小，而高度可以随意按像素大小设置。
Adjust the values of the width and height attributes according to the size of your banner image.
根据旗帜图像的大小调整width和height属性的值。
Adjust the values of the width and height attributes according to the size of your banner image.
根据旗帜图像的大小调整width和height属性的值。
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