github-langs
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Add proper test
Current behavior:
Currently, tests are done via npm run lint
Expected behavior: Write test from unit test, integration test, and E2E test to make sure every change is not breaking current behaviour.
Steps to reproduce: https://github.com/wildan3105/github-langs/blob/d81596c4f237c6545d43b4ba70f182cfc2c5bd13/.travis.yml#L8
Partially covered in #150