Unit Testing

Jest (interesting bug) — dependency on mocking

I met an interesting bug this morning and I would like to share.

I ran the unit test and it throwed me errors. The unit test called the custom initializer at the beginning, and the initializer called 2 functions in the…

Jest — mockReset for afterEach affect toHaveBeenCalledTimes

Problem

I used Jest to mock the function for unit test on the nodeJS application. I ran into a situation that the toHaveBeenCalledTimes actual value not correct for the second ‘it’ test case. The…

faker — useful library for unit and integration testing

I came across that it is very useful to use the faker library to generate random value in unit and integration testing