Pv 2362 increase test coverage

[PussInDasBoot]

Added some tests for stream processing. Just checking we are happy with this format before I continue to write more tests.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 24 lines in your changes missing coverage. Please review.

Project coverage is 17.61%. Comparing base (f395124) to head (b0ac566).

Files with missing lines	Patch %	Lines
...classifier/data_harvester/cataloguing-ISC-noise.py	0.00%	3 Missing ⚠️
...ic/ml_classifier/data_harvester/cataloguing-ISC.py	0.00%	3 Missing ⚠️
seismic/ml_classifier/data_harvester/getwave.py	0.00%	3 Missing ⚠️
seismic/ml_classifier/data_harvester/save-noise.py	0.00%	3 Missing ⚠️
.../ml_classifier/data_harvester/save-traces-SandP.py	0.00%	3 Missing ⚠️
.../ml_classifier/data_harvester/save-traces-justP.py	0.00%	3 Missing ⚠️
.../ml_classifier/data_harvester/save-traces-justS.py	0.00%	3 Missing ⚠️
seismic/ml_classifier/data_harvester/events.py	0.00%	1 Missing ⚠️
...mic/ml_classifier/data_harvester/save-traces-3D.py	0.00%	1 Missing ⚠️
...eismic/ml_classifier/data_harvester/save-traces.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##           develop     #266       +/-   ##
============================================
- Coverage    60.17%   17.61%   -42.56%     
============================================
  Files           86      239      +153     
  Lines        10079    26017    +15938     
  Branches         0     4122     +4122     
============================================
- Hits          6065     4583     -1482     
- Misses        4014    21089    +17075     
- Partials         0      345      +345     

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[geojunky]

Thanks for the PR, Melyn. It looks good, but please undo the changes made to test_stream_curation and test_stream_processing.