Test suite: Move tests to typing.NamedTuple

[tony]

Extracted from #419

[codecov]

Codecov Report

Merging #423 (5148c83) into master (05b6b1f) will increase coverage by 0.16%.
The diff coverage is 100.00%.

❗ Current head 5148c83 differs from pull request most recent head 5c073d4. Consider uploading reports for the commit 5c073d4 to get more accurate results

@@            Coverage Diff             @@
##           master     #423      +/-   ##
==========================================
+ Coverage   84.69%   84.85%   +0.16%     
==========================================
  Files          16       16              
  Lines         921      931      +10     
  Branches      176      178       +2     
==========================================
+ Hits          780      790      +10     
  Misses         90       90              
  Partials       51       51              

Files	Coverage Δ
tests/test_sync.py	91.35% <100.00%> (+1.21%)	⬆️

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