No LOW property in TaskStatusEnum
On this line

I guess there is now LOW property in TaskStatusEnum.
Also when I just forked and cloned the repo and ran the tests it threw me an error. Please can you check and let me know what's going wrong here:

Yea, it's a bug. I found out that I haven't use any enum for Priority, will fix this soon. Thanks for pointing this out.
Also, regarding the tests, they are working fine at my end. Travis CI is also showing build passed which means tests are fine. Did you run yarn run test?
I tried with npm and also with yarn. I don't think this matters much does it? And anyways, it failed in both the cases. :(
No, it doesn't matter at all. I don't know why it's happening with you. Did you change the code before running tests? Can try removing node_modules and installing the packages again and then running tests.
Fine the tests are passing now. I just re cloned the repo 👍