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 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。
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