The ExchangeRate interface was small and simple enough that I could have easily written the mock class manually.

ExchangeRate接口很小很简单，很容易为它手工编写mock类。

youdao

And even if it did by some miracle return ExchangeRate, what happens when I need to mock an instance of a different interface?

即使它能够通过某种奇迹返回ExchangeRate，但是如果需要模拟另一个接口的实例，又会怎么样呢？

youdao

And even if it did by some miracle return ExchangeRate, what happens when I need to mock an instance of a different interface?

即使它能够通过某种奇迹返回ExchangeRate，但是如果需要模拟另一个接口的实例，又会怎么样呢？

youdao