Listing 4. Testing an edge case: What if someone presses the button without typing in a word?

清单4.测试一个极端例子：如果有人没有输入单词就按下了按钮该怎么办？

youdao

Listing 4. Testing an edge case: What if someone presses the button without typing in a word?

清单4.测试一个极端例子：如果有人没有输入单词就按下了按钮该怎么办？

youdao