DM-41182: Add basic functionality test for PropertyMapTractAnalysisTask

[enourbakhsh]

While I was at it, I fixed typos, tweaked the plot action to work with the test, and made other necessary adjustments throughout.

[erykoff]

Image comparison is tricky. But you can't use a hash and expect it'll match with different os's and versions of everything. See my comment below.

[erykoff]

I'd be very shocked if this works; and if it works today it certainly won't tomorrow. Matplotlib images differ subtly from mac to linux and different os and matplotlib versions. You can either use something like test_scatterPlot.py or check in sample images to the tests and use the matplotlib image comparison testing routines which allow some amount of variance from plotted image to reference image.

[enourbakhsh]

I eliminated the hash verification and introduced the validateFigureStructure() and validateRGBFractions() methods to accommodate a degree of variation between the rendered image and the reference image.

[erykoff]

I think this needs to go at the end of the teardown.

[enourbakhsh]

Done! I didn't notice a difference, though.

[erykoff]

This looks fine, though a bit non-standard in the tests.

[erykoff]

This is fine, but we usually use self.assertFloatsAlmostEqual which allows an rtol and/or an atol. I suppose the advantage here is that you get more information on all the channels rather than the first failure, but I wanted to point out the standard tools.

[enourbakhsh]

Thanks for the heads-up. Correct, I went this route because seeing info on all errors is quite handy for quick debugging, especially when multiple criteria are being checked in one go.