remove test_hdf5.h5 after test

[AdamOrmondroyd]

Description

Remove test_hdf5.h5 after performing the test.

Fixes #303

Checklist:

• I have performed a self-review of my own code
• My code is PEP8 compliant (flake8 anesthetic tests)
• My code contains compliant docstrings (pydocstyle --convention=numpy anesthetic)
• New and existing unit tests pass locally with my changes (python -m pytest)
• I have added tests that prove my fix is effective or that my feature works
• I have appropriately incremented the semantic version number in both README.rst and anesthetic/_version.py

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (6c5e8fc) 100.00% compared to head (2d36cf4) 100.00%.

Additional details and impacted files

@@            Coverage Diff            @@
##            master      #309   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           32        32           
  Lines         2764      2764           
=========================================
  Hits          2764      2764           

Impacted Files	Coverage Δ
anesthetic/_version.py	100.00% <100.00%> (ø)

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[AdamOrmondroyd]

I've made the file names different for each root option, to avoid issues with the tests being run in parallel and accessing the file simultaneously

[lukashergt]

Looks like the tmp_path fixture did the trick. Thanks for initiating this, @AdamOrmondroyd, please squash and merge.

[AdamOrmondroyd]

Thanks @lukashergt, deffo need to get more on top of the pytest features!