Implement reactjs + javascript unit tests

[jeff1evesque]

We need to write some initial reactjs + javascript unit tests, and integrate it into our travis ci builds.

Note: this issue will leverage the results found from #3084.

[jeff1evesque]

We'll begin by creating snapshot tests. This means snapshot tests will be saved within test/jest/test/. After finishing writing the snapshot tests, when we run npm test, or jest, our snapshots will be created under test/__snapshots__/xxx, where xxx would be the corresponding snapshot filename. These snapshots should be committed into this issue. Additionally, we'll need to integrate the jest results, with our current code coverage implementation. So, the corresponding jest coverage results, will need to be merged with our existing pytest coverage.

[jeff1evesque]

Now, we can begin to write our snapshot tests, into the designated directory, and fix any docker related syntax, as well as making necessary adjustments to capture, and copy the corresponding coverage results. Assuming that the docker syntax is correct (both in unit-tests, as well as the respective dockerfiles), we'll need to find out how to merge the pytest results, with the jest coverage.

[jeff1evesque]

da6a87e: we install jest globally, so it'll be in the PATH, and can easily be used via our dockerfile.