Parallel Coordinates Test is Not Very Descriptive

[birm]

Currently, the parallel coordinates test simply checks for the existence of a canvas, and squelches most functions for that canvas at that. The mock could be improved and/or an image could be taken so that this can be tested properly.

Ref: https://github.com/sharmalab/eaglescope/blob/main/tests/ParallelCoordinates.test.js