Add jest tests#3
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- Fix the error "Test functions cannot both take a 'done' callback and return something. Either use a 'done' callback, or return a promise."
Fix test case
Fix the test recognizes snapshot is obsolete
Revert the snapshot to suit `@babel/core@7.6.2`
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What is this pull request doing?
This pull request introduces Jest, a popular JavaScript testing framework. We'll use it to learn how to use it for continuous integration.
When the bot asks you to, merge this pull request.