Improve unit-tests across the code base.

[ns-rse]

PRs #50 / #57 /#60 / #61 / #62 addressed the need for regression tests (see #48).

Now that these are in place it is possible to start introducing finer grained unit-tests across the codebase. This will provide immediate benefits...

• Ability to identify errors with higher resolution.
• Improve the range and breadth of conditions under which tests are made.
• Facilitate refactoring of code going forward.

This issue serves as an "Epic" for recording progress of tests written across modules/sub-modules Individual issue and pull-requests can be added against each module/sub-module for reference.

• Unit tests for data module #81
  • data/demo_data.py
  • data/HOA_tools_cec2.py
  • data/scene_builder_cec1.py
  • data/scene_render_cec1.py
  • data/scene_render_cec2.py
  • data/utils.py Introducing tests for clarity.data.utils module #88
• Unit tests for dataset module #82
  • dataset/cec1_dataset.py
• Unit tests for engine module #83
  • engine/losses.py
  • engone/system.py
• Tests for recipes #270
  • recipes/cad1/task1 (partially complete)
  • recipes/cad1/task2 (partially complete)
  • recipes/cec1/baseline
  • recipes/cec1/data_preparation/prepare_cec1_data.py
  • recipes/cec1/e009_sheffield
  • recipes/cec2/baseline
  • recipes/cec2/data_preparation
  • recipes/cpc1/baseline
  • recipes/cpc1/e029_sheffield
  • recipes/cpc1/e032_sheffield
  • recipes/cpc1/test_listener_responses
  • recipes/cpc2 (partially complete)
  • recipes/icassp_2023
• Unit tests for enhancer module #84
  • enhancer/compressor.py
  • enhancer/nalr.py
  • enhancer/dnn
    • enhancer/dnn/mc_conv_tasnet.py
  • enhancer/dsp
    • enhancer/dsp/filter.py
  • enhancer/gha
    • enhancer/gha/audiogram.py
    • enhancer/gha/gainrule_camfit.py
    • enhancer/gha/gha_interface.py
    • enhancer/gha/gha_utils.py
• Unit tests for evaluator module #85
  • evaluator/haspi
    • evaluator/haspi/eb.py
    • evaluator/haspi/ebm.py
    • evaluator/haspi/haspi.py
    • evaluator/haspi/ip.py
  • evaluator/hasqi
    • evaluator/hasqi/hasqi.py
  • evaluator/haaqi
    • evaluator/haaqi/haaqi.py
  • evaluator/mbstoi
    • evaluator/mbstoi/mbstoi.py
    • evaluator/mbstoi/mbstoi_utils.py
  • evaluator/msbg
    • evaluator/msbg/audiogram.py
    • evaluator/msbg/cochlea.py
    • evaluator/msbg/masbg.py
    • evaluator/msbg/masbg_utils.py
    • evaluator/msbg/smearing.py
• Unit tests for predictor module #86
  • predictor/torch_msbg.py
  • predictor/torch_stoi.py