add test and enable github action

[gengjiawen]

Seems no test configured in package.json

sync-directory/package.json

Line 7 in 3e826e8

"test": "echo \"Error: no test specified\" && exit 1"

How about add tests and run it in CI ?

[hoperyy]

test added https://github.com/hoperyy/sync-directory/blob/master/package.json#L7 @gengjiawen

[gengjiawen]

test added /package.json@master#L7 @gengjiawen

The code is just a method call without any test case. It would be much better we add jest or ava to really test code.

[hoperyy]

It's better! I'll add full tests when they're needed in newer versions.