379 identify all code not covered by unit test

[mathpluscode]

Description

Cover or ignore some tests, so that test coverage is 100%.

Fixes #379

Type of change

What types of changes does your code introduce to DeepReg?

Please check the boxes that apply after submitting the pull request.

• [ ] Bugfix (non-breaking change which fixes an issue)
• [ ] Code style update (formatting, renaming)
• [ ] Refactoring (no functional changes, no api changes)
• [ ] Documentation Update (fix or improvement on the documentation)
• [ ] New feature (non-breaking change which adds functionality)
• [x] Other (if none of the other choices apply)

Checklist

Please check the boxes that apply after submitting the pull request.

If you're unsure about any of them, don't hesitate to ask. We're here to help! This is simply a reminder of what we are going to look for before merging your code.

• [x] I have installed pre-commit using pre-commit install and formatted all changed files. If you are not certain, run pre-commit run --all-files.
• [x] My commits' message styles matches our requested structure, e.g. Issue #<issue number>: detailed message.
• [x] I have updated the change log file regarding my changes.
• [x] I have added tests that prove my fix is effective or that my feature works
• [ ] I have added necessary documentation (if appropriate)

[mathpluscode]

Another quick MR to improve test coverage to 100% @YipengHu @kate-sann5100

[codecov[bot]]

Codecov Report

Merging #639 (20e7a26) into main (4bfd1d8) will increase coverage by 0.32%. The diff coverage is 100.00%.

@@             Coverage Diff             @@
##             main      #639      +/-   ##
===========================================
+ Coverage   99.67%   100.00%   +0.32%     
===========================================
  Files          33        33              
  Lines        2175      2173       -2     
===========================================
+ Hits         2168      2173       +5     
+ Misses          7         0       -7     

Impacted Files	Coverage Δ
deepreg/dataset/loader/grouped_loader.py	100.00% <ø> (+0.87%)	:arrow_up:
deepreg/dataset/loader/h5_loader.py	100.00% <ø> (+1.47%)	:arrow_up:
deepreg/dataset/loader/nifti_loader.py	100.00% <ø> (+1.47%)	:arrow_up:
deepreg/predict.py	100.00% <ø> (+1.06%)	:arrow_up:
deepreg/warp.py	100.00% <100.00%> (+5.40%)	:arrow_up:
deepreg/model/layer.py	100.00% <0.00%> (+0.41%)	:arrow_up:

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[scrutinizer-notifier]

The inspection completed: 13 new issues, 7 updated code elements