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Just like we initialize the main HNN GUI window (hnn_qt5.py) during testing and then have it gracefully exit with
TRAVIS_TESTING=1
, we can do the same with windows showing dipole, raster, spectrogram, and PSD plots. This PR adds tests for each of those windows that simply initializes the window and then exits. If there no uncaught exceptions, then the process that started the window will exit successfully and the test will pass.Tests can be improved further in #232 (a test for somatic voltages should be added). Having this in place will allow for catching errors potentially exposed by #236.
Resolves #243