[JS] Add unit test suite

[asfimport]

Write unit tests for the Javascript library and integrate with CI

Reporter: Brian Hulette
Assignee: Brian Hulette / @TheNeuralBit

Related issues:

• [JS] Implement JavaScript-compatible implementation (Is contained by)

_{Note: This issue was originally created as ARROW-629. Please see the migration documentation for further details.}

[asfimport]

Brian Hulette:
Any suggestions for a testing framework? I've used karma before, but I'm open to other suggestions

[asfimport]

Wes McKinney / @wesm:
Jupyterlab uses Karma, so I think that's a safe bet https://github.com/jupyterlab/jupyterlab/tree/master/test

[asfimport]

Wes McKinney / @wesm:
Resolved by PR 22c738c