Refactor hls tests

[Karolk99]

No description provided.

[Rados13]

This could be put into the function and then call it in all tests.

 defp assert_track(type) do 
      assert_receive({:playlist_playable, :"#{type}", ^output_dir}, 10_000)
      assert_receive({:segment, "#{type}_segment_1" <> _}, 15_000)
      assert_receive({:manifest, %{"#{type}_segments": 2}})
 end

[Rados13]

Suggested change

	Enum.find(manifest_files, nil, &String.match?(&1, ~r/^(?!index).*$/))
	|> then(&Path.join(output_dir, &1))
	manifest_files
	|> Enum.find(nil, &String.match?(&1, ~r/^(?!index).*$/))
	|> then(&Path.join(output_dir, &1))

[Rados13]

Also, lint and tests fail.

[codecov]

Codecov Report

Merging #281 (64f05ae) into integrate-live-audio-mixer (d0f9308) will increase coverage by 4.45%.
The diff coverage is 88.46%.

@@                      Coverage Diff                       @@
##           integrate-live-audio-mixer     #281      +/-   ##
==============================================================
+ Coverage                       58.44%   62.90%   +4.45%     
==============================================================
  Files                              43       44       +1     
  Lines                            2101     2127      +26     
==============================================================
+ Hits                             1228     1338     +110     
+ Misses                            873      789      -84     

Impacted Files	Coverage Δ
test/support/hls_storage.ex	88.46% <88.46%> (ø)

... and 8 files with indirect coverage changes

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