如何在每次测试之前重置Jest模拟函数调用计数

I'm new to Jest, I'm trying to use it for testing if a function was called or not. I noticed the mock.calls.length is not resetting for every test but accumulating. How can I make it 0 before every test? I don't want my next tests depends on the results of the previous.I'm new to Jest, I'm trying to use it for testi