Invalid @covers annotations in SpanTest create warning in PHPunit runs

[amber0612]

#732

[codecov]

Codecov Report

Merging #752 (947b2de) into main (aaa93ee) will decrease coverage by 3.25%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##               main     #752      +/-   ##
============================================
- Coverage     82.86%   79.60%   -3.26%     
  Complexity     1295     1295              
============================================
  Files           150      150              
  Lines          3192     3192              
============================================
- Hits           2645     2541     -104     
- Misses          547      651     +104     

Flag	Coverage Δ
7.4	79.58% <ø> (-3.29%)	⬇️
8.0	79.66% <ø> (-3.27%)	⬇️
8.1	79.66% <ø> (-3.27%)	⬇️

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Impacted Files	Coverage Δ
src/SDK/Trace/Span.php	12.50% <0.00%> (-81.74%)	⬇️
src/SDK/Trace/SpanLimits.php	0.00% <0.00%> (-75.00%)	⬇️
src/API/Trace/AbstractSpan.php	0.00% <0.00%> (-38.89%)	⬇️
src/SDK/Trace/TracerProvider.php	65.00% <0.00%> (ø)
src/SDK/Trace/TracerProviderFactory.php	100.00% <0.00%> (ø)

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[bobstrecansky]

Reran these tests after the fix; looks better now.

[bobstrecansky]

I think the only thing left on this PR is @brettmc 's comments.