Refactor hls tests (remove sleep())

[Karolk99]

No description provided.

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@1620023). Click here to learn what that means.
The diff coverage is 94.11%.

@@            Coverage Diff            @@
##             master     #245   +/-   ##
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  Coverage          ?   57.67%           
=========================================
  Files             ?       38           
  Lines             ?     1786           
  Branches          ?        0           
=========================================
  Hits              ?     1030           
  Misses            ?      756           
  Partials          ?        0           

Impacted Files	Coverage Δ
lib/membrane_rtc_engine/engine.ex	74.28% <ø> (ø)
..._rtc_engine/endpoints/hls/stream_format_updater.ex	86.66% <50.00%> (ø)
lib/membrane_rtc_engine/endpoints/hls_endpoint.ex	77.08% <100.00%> (ø)

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[mickel8]

I assume that changes in fixtures are expected?

[mickel8]

Really like those changes 👍

[Karolk99]

I assume that changes in fixtures are expected?

Yes, besides waiting for a message instead of Process.sleep() I also fixed one problem with propagating end_of_stream in the HLS pipeline that's why fixtures look different. I also checked those files with the use of ffplay.